FCC ID: XRAFB424 Wireless Activity Tracker

WARNING:pdfminer.pdfpage:The PDF <_io.BufferedReader name='/Volumes/Scratch/Incoming/eg-scratch/6029012.pdf'> contains a metadata field indicating that it should not allow text extraction. Ignoring this field and proceeding. Use the check_extractable if you want to raise an error in this case FB424 User Manual 1 Table of Contents Get started What's in the box Charge your tracker Set up FB424 See your data in the Fitbit app Unlock Fitbit Premium Wear FB424 Placement for all-day wear vs. exercise Handedness Wear FB424 in a clip Wear and care tips Change the band Basics Navigate FB424 Adjust settings Check battery level Adjust always-on display Turn off the screen Apps and Clock Faces Change the clock face Open apps Notifications from your phone Set up notifications See incoming notifications Manage notifications Turn off notifications Answer or reject phone calls Respond to messages (Android phones) 6 6 6 7 7 8 9 9 9 10 11 11 12 12 14 15 15 16 17 17 17 18 18 18 18 19 19 19 2 Timekeeping Use the Alarms app Use the Timers app Activity and Wellness See your stats Track a daily activity goal Track your hourly activity Track your sleep Manage stress Advanced health metrics Exercise and Heart Health Track your exercise automatically Track and analyze exercise with the Exercise app Check your heart rate Receive heart-rate notifications Check your daily readiness score View your cardio fitness score Share your activity Update, Restart, and Erase Update FB424 Restart FB424 Erase FB424 Troubleshooting Heart-rate signal missing Other issues General Info and Specifications Sensors and Components Materials Wireless technology Haptic feedback 20 20 20 21 21 21 22 22 23 23 25 25 25 27 29 29 30 30 31 31 31 31 33 33 33 34 34 34 34 34 3 Battery Memory Display Band size Environmental conditions Learn more Return policy and warranty Regulatory & Safety Notices USA: Federal Communications Commission (FCC) statement Canada: Industry Canada (IC) statement European Union (EU) Argentina Australia and New Zealand Belarus Customs Union Ghana India Indonesia Israel Japan Kingdom of Saudi Arabia Malaysia Mexico Morocco Nigeria Oman Paraguay Philippines Serbia Singapore 34 34 34 35 35 35 35 36 36 37 38 39 40 40 40 41 41 41 41 41 42 42 42 43 43 43 43 44 44 44 4 South Korea Taiwan Thailand United Arab Emirates United Kingdom Vietnam About the Battery IP Rating Safety Statement Regulatory Markings 44 45 47 48 48 48 49 49 49 50 5 Get started Do what you love and feel your best Fitbit FB424. This fitness tracker has 24/7 heart rate, always-

on health tracking, stress management score, sleep tracking, up to 10 days of battery, and more. Take a moment to review our complete safety information at fitbit.com/safety. FB424 is not intended to provide medical or scientific data. What's in the box Your FB424 box includes:

Tracker with small band

(color and material varies) Charging cable Additional large band The detachable bands on FB424 come in a variety of colors and materials, sold separately. Charge your tracker A fully-charged FB424 has a battery life of up to 10 days. Battery life and charge cycles vary with use and other factors; actual results will vary. To charge FB424:

1. Plug the charging cable into the USB port on your computer, a UL-certified USB wall charger, or another low-energy charging device. 2. Align the pins on the other end of the charging cable with the gold contacts on the back of FB424. Gently press FB424 into the charger until it snaps into place. To remove FB424 from the charging cable:

1. Hold FB424 and slide your thumb nail between the charger and the back of the tracker on one of the corners. 2. Gently press down on the charger until it separates from the tracker. Charging fully takes about 1-2 hours. While FB424 charges, double-tap the screen or press the buttons to check the battery level. Swipe right on the battery screen to use FB424. A fully charged tracker shows a solid battery icon. 6 Set up FB424 Set up FB424 with the Fitbit app. The Fitbit app is compatible with most popular phones. See fitbit.com/devices to check if your phone is compatible. To get started:

1. Download the Fitbit app:

Apple App Store for iPhones Google Play Store for Android phones 2. Install the app, and open it. If you already have a Fitbit account, log in to your account your profile picture If you don't have a Fitbit account, tap Join Fitbit to be guided through a series of questions to create a Fitbit account. Set Up a Device. tap the Today tab 3. Continue to follow the on-screen instructions to connect FB424 to your account. When you're done with setup, read through the guide to learn more about your new tracker and then explore the Fitbit app. For more information, see the related help article. See your data in the Fitbit app Open the Fitbit app on your phone to view your activity, health metrics, and sleep data; log food and water; participate in challenges; and more. 7 Unlock Fitbit Premium Fitbit Premium is your personalized resource in the Fitbit app that helps you stay active, sleep well, and manage stress. A Premium subscription includes programs tailored to your health and fitness goals, personalized insights, hundreds of workouts from fitness brands, guided meditations, and more. FB424 includes a 6-month Fitbit Premium membership for eligible customers in certain countries. For more information, see the related help article. 8 Wear FB424 Choose to wear FB424 around your wrist or in the clip accessory (sold separately). If you need to remove the band or attach a different band, see the instructions in "Change the band" on page . When you wear FB424 in the band, make sure your tracker is set to WORN On Wrist

. When you wear FB424 in the accessory clip, make sure its set to CLIPPED On Body information, see "Navigate FB424" on page . For more Placement for all-day wear vs. exercise When you're not exercising, wear FB424 a finger's width above your wrist bone. In general, it's always important to give your wrist a break on a regular basis by removing your tracker for around an hour after extended wear. We recommend removing your tracker while you shower. Although you can shower while wearing your tracker, not doing so reduces the potential for exposure to soaps, shampoos, and conditioners, which can cause long-term damage to your tracker and may cause skin irritation. For optimized heart-rate tracking while exercising:

During a workout, experiment with wearing your tracker a bit higher on your wrist for an improved fit. Many exercises, such as bike riding or weight lifting, cause you to bend your wrist frequently, which could interfere with the heart-rate signal if the tracker is lower on your wrist. Wear your tracker on top of your wrist, and make sure the back of the device is in contact with your skin. Consider tightening your band before a workout and loosening it when youre done. The band should be snug but not constricting (a tight band restricts blood flow, potentially affecting the heart-rate signal). Handedness For greater accuracy, you must specify whether you wear FB424 on your dominant or non-

dominant hand. Your dominant hand is the one you use for writing and eating. To start, the Wrist setting is set to non-dominant. If you wear FB424 on your dominant hand, change the Wrist setting in the Fitbit app:

9 From the Today tab in the Fitbit app, tap your profile picture FB424 tile Wrist Dominant. Wear FB424 in a clip Wear FB424 clipped to your clothing. Remove the bands, and place your tracker in the clip. For more information, see "Change the band" on page . To put FB424 in the clip:

1. If you previously wore FB424 on your wrist, change your device setting to CLIPPED On Body

. For more information, see "Navigate FB424" on page . Note: Make sure FB424 is set to WORN On Wrist when you wear your tracker in the band. 2. Hold the tracker with the screen facing you. Make sure the time isn't upside down. 3. Hold the clip accessory with the opening facing you and the clip on the back facing down. 4. Place the top of the tracker into the clip opening and move the bottom of the tracker into place. FB424 is secure when all edges of the clip lie flat against the tracker. Note that when FB424 is set to CLIPPED On Body heart-rate tracking, automatic exercise tracking, and Active Zone Minutes.

, certain features are turned off, including Clip Placement Wear FB424 on or close to your body with the screen facing outward. Secure the clip tightly to a shirt pocket, bra, pants pocket, belt, or waistband. Try out a few different locations to see what's most comfortable and secure for you. If you experience skin irritation when wearing FB424 on your bra or waistband, clip it to an external piece of clothing instead, such as your belt or pocket. 10 Wear and care tips If your tracker gets wet, remove and dry it completely after your activity. Clean your band and wrist regularly with a soap-free cleanser. Take your tracker off from time to time. Your tracker may show minor wear over time. Always clean it with a soft cloth and avoid contact with hard surfaces. Change the band FB424 comes with a small band attached and an additional large, bottom band in the box. Both the top and bottom bands can be swapped with accessory bands, sold separately on fitbit.com. For band measurements, see "Band size" on page . Remove a band 1. Turn over FB424 and find the quick-release lever. 2. While pressing the quick-release lever inward, gently pull the band away from the tracker to release it. 3. Repeat on the other side. Attach a band 1. To attach a band, hold the band and slide the pin (the side opposite the quick-release lever) into the notch on the tracker. 2. While pressing the quick-release lever inward, slide the other end of the band into place. 3. When both ends of the pin are inserted, release the quick-release lever. 11 Basics Learn how to manage settings, navigate the screen, and check the battery level. Navigate FB424 FB424 has a color AMOLED touchscreen display. Navigate FB424 by tapping the screen and swiping side to side and up and down. To preserve battery, the trackers screen turns off when not in use. Basic navigation The home screen is the clock. To wake FB424, double tap the screen or turn your wrist. Swipe down from the top of the screen to access quick settings and the Settings app. While in quick settings, swipe right to return to the clock screen. Swipe up to see your daily stats. To return to the clock screen, swipe right. Swipe left and right to see the apps on your tracker. Swipe right to go back to a previous screen. Press the buttons to return to the clock screen. Quick settings For a faster way to access certain settings, swipe down from the clock screen. Tap a setting to adjust it. When you turn off a setting, the icon appears dim with a line through it. DND mode When the do not disturb setting is on:

Notifications, goal celebrations, and reminders are muted. The do not disturb icon illuminates in quick settings. You can't turn on the do not disturb setting and sleep mode at the same time. Sleep mode When the sleep mode setting is on:

Notifications, goal celebrations, and reminders are muted. The screen's brightness is set to dim. The screen stays dark when you turn your wrist. To wake FB424, firmly tap the screen twice. 12 The sleep mode icon illuminates in quick settings. Sleep mode can be turned on and off manually. You can set up a schedule to turn sleep mode on and off automatically. For more information, see "Adjust settings" on page You can't turn on the do not disturb setting and sleep mode at the same time. Auto Wake When you set Auto Wake to on , the screen turns on each time you turn your wrist. When you set screen wake to off, press the buttons or firmly tap the screen twice to turn it on. WORN On Wrist When FB424 is on your wrist, make sure the tracker is set to WORN On Wrist

/ CLIPPED On Body setting Water lock

. When FB424 is in the clip, make sure the tracker is set to CLIPPED On Body

. Turn on the water lock setting when you're in water, for example showering or swimming, to prevent your screen from activating. When water lock is on, your screen and buttons lock, and the water lock icon appears at the bottom. Notifications and alarms still appear on your tracker, but you must unlock your screen to interact with them. tap Water firmly tap your screen twice. To turn off water lock, firmly double-

To turn on water lock, tap swipe down from the clock screen Lock tap the middle of the screen with your finger. If you don't see "Unlocked"

appear on screen, try tapping harder. Turning off this feature uses the accelerometer in your device, which takes more force to activate. Note that water lock turns on automatically when you start a swim in the Exercise app. Settings app Tap the Settings app to open it. For more information, see "Adjust settings" on page . 13 Adjust settings Manage basic settings in the Settings app. Swipe down from the clock screen and tap the Settings app to open it. Tap a setting to adjust it. Swipe to see the full list of settings. Display settings Brightness Change the screen's brightness. Screen wake Change whether the screen turns on when you turn your wrist. Screen timeout Adjust the amount of time before the screen turns off or switches to the always-on display clock face. Always-on display Turn always-on display on or off. For more information, see "Adjust always-on display" on page . Quiet modes Do not disturb Exercise focus Sleep mode schedule Turn off all notifications. Turn off notifications while using the Exercise app. Adjust sleep mode settings, including setting a schedule for the mode to automatically turn on and off. To set a schedule:

1. Open the Settings app and tap Quiet modes Sleep Mode Schedule Interval. 2. Tap the start or end time to adjust when the mode turns on and off. Swipe up or down to change the time, and tap the time to select it. Sleep mode automatically turns off at the time you schedule, even if you manually turned it on. Other settings Heart rate Turn heart-rate tracking on or off. Heart zone notifications Turn the heart-zone notifications that you receive during everyday activity on or off. For more information, see the related help article. 14 Button Lock Turn on Button Lock to prevent the buttons on your tracker from activating while your screen is off. To turn Button Lock on or off, tap the setting tap to confirm. Tip: Use this setting to avoid unintended button presses while you exercise, especially if you wear FB424 lower on your wrist or you tighten the band to be extra snug. For more information, see "Wear FB424". Note: Using the Button Lock setting on FB424 may require more frequent charging. Vibrations Adjust your tracker's vibration strength. Device Info View your tracker's regulatory information and activation date, which is the day your tracker's warranty begins. The activation date is the day you set up your device. Tap Device Info System Info to see the activation date. For more information, see the related help article. Restart device Tap Restart device Restart to restart your tracker. Check battery level From the clock face, swipe up. The battery level is at the top of the screen. If your tracker's battery is low (fewer than 24 hours remaining), the battery indicator turns red. If your tracker's battery is critically low (fewer than 4 hours remaining), a warning appears on the clock face and the battery indicator flashes. Swipe right to dismiss the warning. Adjust always-on display Turn on always-on display to show the time on your tracker, even when you're not interacting with the screen. To turn always-on display on or off:

1. Swipe down from the clock face to access quick settings. 2. Tap the Settings app 3. Tap Always-on display to turn the setting on or off. To set the display to automatically turn Always-on display. Display settings off during certain hours, tap Off-hours. Note that turning on this feature impacts your tracker's battery life. When always-on display is turned on, FB424 requires more frequent charging. 15 Clock faces without an always-on display mode use a default always-on display clock face. Always-on display automatically turns off when your tracker's battery is critically low. For more information, see the related help article. Turn off the screen To turn off your tracker's screen when not in use, return to the clock-face screen and press the side buttons, or briefly cover the tracker face with your opposite hand. Note that if you turn on the always-on display setting, the screen won't turn off. 16 Apps and Clock Faces Learn how to change your clock face and access apps on FB424. Change the clock face The Fitbit Gallery offers a variety of clock faces to personalize your tracker. 1. From the Today tab in the Fitbit app, tap your profile picture 2. Tap Gallery 3. Browse the available clock faces. Tap a clock face to see a detailed view. 4. Tap Install to add the clock face to FB424. Clocks tab. FB424 tile. Open apps From the clock face, swipe left and right to see the apps installed on your tracker. Swipe up or tap an app to open it. Swipe right to return to a previous screen, or double tap to return to the clock screen. 17 Notifications from your phone FB424 can show call, text, calendar, and app notifications from your phone to keep you informed. Keep your tracker within 30 feet of your phone to receive notifications. Set up notifications Check that Bluetooth on your phone is on and that your phone can receive notifications (often under Settings Notifications). Then set up notifications:

1. From the Today tab in the Fitbit app, tap your profile picture 2. Tap Notifications. 3. Follow the on-screen instructions to pair your tracker if you haven't already. Call, text, and FB424 tile. calendar notifications are turned on automatically. 4. To turn on notifications from apps installed on your phone, including Fitbit and WhatsApp, tap App Notifications and turn on the notifications you want to see. Note that if you have an iPhone, FB424 shows notifications from all calendars synced to the Calendar app. If you have an Android phone, FB424 shows calendar notifications from the calendar app you chose during setup. For more information, see the related help article. See incoming notifications A notification causes your tracker to vibrate. Tap the notification to expand the message. If you don't read the notification when it arrives, you can check it later in the Notifications app . Swipe right or left to the Notifications app, then swipe up to open it. Your tracker shows the first 250 characters of the notification. Check your phone for the full message. Manage notifications FB424 stores up to 10 notifications, after which the oldest are replaced as you receive new ones. Manage notifications in the Notifications app:

Swipe up to scroll through your notifications, and tap any notification to expand it. To delete a notification, tap to expand it, then swipe to the bottom and tap Clear. To delete all notifications at once, swipe up until you reach the end of your notifications and tap Clear All. To exit the notifications screen, swipe right. 18 Turn off notifications Turn off certain notifications in the Fitbit app, or turn off all notifications in quick settings on FB424. When you turn off all notifications, your tracker won't vibrate and the screen won't turn on when your phone receives a notification. To turn off certain notifications:

1. From the Today tab in the Fitbit app on your phone, tap your profile picture FB424 tile Notifications. 2. Turn off the notifications you no longer want to receive on your tracker. To turn off all notifications:

1. From the clock face, swipe down to access quick settings. 2. Turn on DND Mode. All notifications and reminders are turned off. Note that if you use the do not disturb setting on your phone, you don't receive notifications on your tracker until you turn off this setting. Answer or reject phone calls If paired to an iPhone or Android phone, FB424 lets you accept or reject incoming phone calls. To accept a call, swipe down from the top of the screen. Note that you can't speak into the tracker accepting a phone call answers the call on your nearby phone. To reject a call, swipe up from the bottom of the screen. The caller's name appears if that person is in your contacts list; otherwise you see a phone number. Respond to messages (Android phones) Respond directly to text messages and notifications from certain apps on your tracker with preset quick replies. Keep your phone nearby with the Fitbit app running in the background to respond to messages from your tracker. To respond to a message:

1. Open the notification you want to respond to. 2. Choose how to reply to the message:

Tap the text icon to respond to a message from a list of quick replies. Tap the emoji icon to respond to the message with an emoji. For more information, including how to customize quick replies, see the related help article. 19 Timekeeping Alarms vibrate to wake or alert you at a time you set. Set up to 8 alarms to occur once or on multiple days of the week. You can also time events with the stopwatch or set a countdown timer. Use the Alarms app Set one-time or recurring alarms with the Alarms app. When an alarm goes off, your tracker vibrates. When setting an alarm, turn on Smart Wake to allow your tracker to find the best time to wake you within 30 minutes before the alarm time you set. It avoids waking you during deep sleep so you're more likely to wake up feeling refreshed. If Smart Wake cant find the best time to wake you, your alarm alerts you at the set time. For more information, see the related help article. Dismiss or snooze an alarm When an alarm goes off, your tracker vibrates. To dismiss the alarm, swipe up from the bottom of the screen and tap the dismiss icon. To snooze the alarm for 9 minutes, swipe down from the top of the screen or press the buttons. Snooze the alarm as many times as you want. FB424 automatically goes into snooze mode if you ignore the alarm for more than 1 minute. Use the Timers app Time events with the stopwatch or set a countdown timer with the Timers app on your tracker. You can run the stopwatch and countdown timer at the same time. If always-on display is on, the screen continues to display the stopwatch or countdown timer until it ends or you exit the app. For more information, see the related help article. 20 Activity and Wellness FB424 continuously tracks a variety of stats whenever you wear it. Data automatically syncs with the Fitbit app throughout the day. See your stats Swipe up from the clock face to see your daily stats, including:

Core stats Heart rate Exercise Sleep Steps taken today, distance covered, calories burned, and Active Zone Minutes Current heart rate and either your heart-rate zone or resting heart rate (if not in a zone) Number of days you met your exercise goal this week Sleep duration Hourly activity The number of hours today you met your hourly activity goal Menstrual health Oxygen Saturation

(SpO2) Information on the current stage of your menstrual cycle, if applicable Your most recent resting SpO2 average and range If you set a goal in the Fitbit app, a ring shows your progress toward that goal. Find your complete history and other information detected by your tracker in the Fitbit app. Track a daily activity goal FB424 tracks your progress toward a daily activity goal of your choice. When you reach your goal, your tracker vibrates and shows a celebration. Choose a goal Set a goal to help you get started on your health and fitness journey. To begin, your goal is to take 10,000 steps per day. Choose to change the number of steps, or pick a different activity goal depending on your device. 21 For more information, see the related help article. Track progress toward your goal on FB424. For more information, see "See your stats" on page . Track your hourly activity FB424 helps you stay active throughout the day by keeping track of when you're stationary and reminding you to move. Reminders nudge you to walk at least 250 steps each hour. You feel a vibration and see a reminder on your screen at 10 minutes before the hour if you haven't walked 250 steps. When you meet the 250-step goal after receiving the reminder, you feel a second vibration and see a congratulatory message. For more information, see the related help article. Track your sleep Wear FB424 to bed to automatically track basic stats about your sleep, including your time asleep, sleep stages (time spent in REM, light sleep, and deep sleep), and sleep score (the quality of your sleep). Sleep stages and sleep score require a minimum duration of 3h asleep. FB424 also tracks your estimated oxygen variation throughout the night to help you uncover potential breathing disturbances and SpO2 levels, which estimate the amount of oxygen in your blood. To see your sleep stats, sync your tracker when you wake up and check the Fitbit app, or swipe up from the clock face on your tracker after syncing. For more information, see the related help article. Set a sleep goal To start, you have a sleep goal of 8 hours of sleep per night. Customize this goal to meet your needs. For more information, see the related help article. Learn about your sleep habits With a Fitbit Premium subscription, see more details about your sleep score and how you compare to your peers, which can help you build a better sleep routine and wake up feeling refreshed. For more information, see the related help article. 22 Manage stress Track and manage your stress with mindfulness features. Practice guided breathing The Relax app on FB424 provides personalized guided breathing sessions to help you find moments of calm throughout the day. All notifications are automatically disabled during the session. 1. On FB424, swipe left or right to the Relax app and tap to open it. 2. To begin a session the same length as your previous session, tap Start. To set a custom length of time for the session:

1. Swipe up and tap Custom. 2. Swipe up or down to choose the number of minutes, then tap to set the minutes. 3. Tap Start. 3. Follow the on-screen instructions. When you're done, view your summary, and tap Done to close the app. For more information, see the related help article. Check your Stress Management Score Based on your heart rate, exercise, and sleep data, your Stress Management Score helps you see if your body is showing signs of stress on a daily basis. The score ranges from 1 to 100, where a higher number means your body is showing fewer signs of physical stress. To see your daily stress management score, wear your tracker to sleep, and open the Fitbit app on your phone the next morning. From the Today tab, tap the Stress Management tile. Log how you feel throughout the day to get a clearer picture of how your mind and body respond to stress. With a Fitbit Premium subscription, see details about your score breakdown. For more information, see the related help article. Advanced health metrics Know your body better with health metrics in the Fitbit app. This feature helps you view key metrics tracked by your Fitbit device over time so that you can see trends and assess whats changed. Metrics include:

Oxygen saturation (SpO2) Skin temperature variation 23 Heart-rate variability Resting heart rate Breathing rate Note: This feature is not intended to diagnose or treat any medical condition and should not be relied on for any medical purposes. It is intended to provide information that can help you manage your well-being. If you have any concerns about your health, please talk to a healthcare provider. If you believe you are experiencing a medical emergency, call emergency services. For more information, see the related help article. 24 Exercise and Heart Health Automatically track exercise or track activity with the Exercise app to see real-time stats and a post-

workout summary. Check the Fitbit app to share your activity with friends and family, see how your overall fitness level compares to your peers, and more. Track your exercise automatically FB424 automatically recognizes and records many high-movement activities which are at least 15 minutes long. See basic stats about your activity in the Fitbit app on your phone. From the Today tab, tap the Exercise tile. For more information, see the related help article. Track and analyze exercise with the Exercise app Track specific exercises with the Exercise app on FB424 to see real-time stats, including heart-rate data, calories burned, elapsed time, and a post-workout summary on your wrist. For complete workout stats, and a workout intensity map if you used GPS, tap the Exercise tile in the Fitbit app. FB424 uses the GPS sensors on your nearby phone to capture GPS data. GPS requirements Connected GPS is available for all supported phones with GPS sensors. For more information, see the related help article. 1. Turn on Bluetooth and GPS on your phone. 2. Make sure FB424 is paired to your phone. 3. Make sure the Fitbit app has permission to use GPS or location services. 4. Keep your phone with you while you exercise. To track an exercise:

1. On FB424, swipe left or right to the Exercise app, then swipe up to find an exercise. 2. Tap the exercise to choose it. If the exercise uses GPS, you can wait for the signal to connect, or start the exercise and GPS will connect when a signal is available. Note that GPS can take a few minutes to connect. 25 3. Tap the play icon to begin the exercise, or swipe up to choose an exercise goal or adjust the settings. For more information on the settings, see "Customize your exercise settings" on page . 4. Tap the middle of the screen to scroll through your real-time stats. To pause your workout, swipe up and tap Pause. 5. When you're done with your workout, swipe up and tap Pause Finish . Your workout summary appears. 6. Swipe up and tap Done to close the summary screen. Notes:

If you set an exercise goal, your tracker alerts you when youre halfway to your goal and when you reach the goal. If the exercise uses GPS, "GPS connecting..." appears at the top of the screen. When the screen says "GPS connected" and FB424 vibrates, GPS is connected. Customize your exercise settings Customize settings for each exercise type on your device or in the Fitbit app. Change or reorder exercise shortcuts in the Fitbit app. Settings include:

Heart Zone Notifications Receive notifications when you hit target heart-rate zones during your workout. For more information, see the related help article Laps GPS Auto-Pause Run Detect Receive notifications when you reach certain milestones during your workout Track your route using GPS Automatically pause a run when you stop moving Track runs automatically without opening the Exercise app Always-on Display Keep the screen on during exercise Pool Length Set the length of your pool Unit Interval Change the unit of measurement you use for pool length Adjust the move and rest intervals used during interval training To customize the settings for each exercise type on your tracker:

1. Swipe to the Exercise app, then swipe up to find an exercise. 2. Tap the exercise to choose it. 3. Swipe up through the exercise settings. Tap a setting to adjust it. 4. When you're done, swipe down until you see the play icon. 26 To customize certain exercise settings and change or reorder Exercise app shortcuts in the Fitbit app:

1. From the Today tab in the Fitbit app, tap your profile picture 2. Tap Exercise Shortcuts. FB424 tile. To add a new exercise shortcut, tap the + icon and select an exercise. To remove an exercise shortcut, swipe left on a shortcut. To reorder an exercise shortcut, tap Edit (iPhones only), and press and hold the menu icon

, then drag it up or down. To customize an exercise setting, tap an exercise and adjust your settings. You can have up to 6 exercise shortcuts on FB424. For more information, see the related help article. Check your workout summary After you complete a workout, FB424 shows a summary of your stats. Check the Exercise tile in the Fitbit app to see additional stats and a workout intensity map if you used GPS. Check your heart rate Heart-rate zones help you target the training intensity of your choice. Three zones based on American Heart Association recommendations are available, or you can create a custom zone if you have a specific heart rate you're targeting. Default heart-rate zones Zone Calculation Description Below Zone Below 50% of your maximum heart rate Below the fat burn zone, your heart beats at a slower pace. Fat Burn Zone Between 50%

and 69% of your maximum heart rate In the fat burn zone, youre likely in a moderate activity such as a brisk walk. Your heart rate and breathing might be elevated, but you can still carry on a conversation. 27 Zone Calculation Description In the cardio zone, youre likely doing a vigorous activity such as running or spinning. In the peak zone, youre likely doing a short, intense activity that improves performance and speed, such as sprinting or high-intensity interval training. Cardio Zone Peak Zone Between 70%

and 84% of your maximum heart rate Greater than 85% of your maximum heart rate Custom heart-rate zones Instead of using these heart-rate zones, you can create a custom zone in the Fitbit app to target a specific heart-rate range. For more information, see the related help article. Earn Active Zone Minutes Earn Active Zone Minutes for time spent in the fat burn, cardio, or peak heart-rate zones. To help you maximize your time, you earn 2 Active Zone Minutes for each minute youre in the cardio or peak zones. 1 minute in the fat burn zone = 1 Active Zone Minute 1 minute in the cardio or peak zones = 2 Active Zone Minutes There are 2 ways FB424 notifies you about Active Zone Minutes:

A few moments after you enter a different heart-rate zone during your exercise using the Exercise app, so that you know how hard youre working. The number of times your tracker vibrates indicates which zone youre in:

1 buzz = fat burn zone 2 buzzes = cardio zone 3 buzzes = peak zone 7 minutes after you enter a heart-rate zone throughout the day (for example, during a brisk walk). Heart-zone notifications are turned off to start. To turn them on:

28 Heart-zone notifications during exercise in the Exercise appsee "Track and analyze exercise with the Exercise app" on page Heart-zone notifications during everyday activitysee "Adjust settings" on page To start, your weekly goal is set to 150 Active Zone Minutes. Youll receive notifications as you reach your goal. For more information, see the related help article. Receive heart-rate notifications Stay informed when FB424 detects that your heart rate is outside of your high or low thresholds when you appear to be inactive for at least 10 minutes. To turn this feature off or adjust the thresholds:

1. From the Today tab in the Fitbit app on your phone, tap your profile picture FB424 tile. 2. In the Activity & Wellness section, tap Heart Settings High & low heart rate. 3. Turn High heart rate notification or Low heart rate notification on or off, or tap Custom to adjust the threshold. View past heart-rate notifications, log possible symptoms and causes, or delete notifications in the Fitbit app. For more information, see the related help article. Check your daily readiness score Understand whats best for your body with the daily readiness score, available with a Fitbit Premium subscription. Check the Fitbit app each morning to see your score, ranging from 1 to 100, based on your activity, sleep, and heart rate variability. A high score means youre ready to exercise, while a low score suggests you should focus on recovery. When you check your score, you also see a breakdown of what impacted your score, a personalized activity goal for the day, and recommended workouts or recovery sessions. 29 To see your daily readiness score, wear your tracker to sleep, and open the Fitbit app on your phone the next morning. From the Today tab, tap the Readiness tile. For more information, see the related help article. View your cardio fitness score View your overall cardiovascular fitness in the Fitbit app. See your cardio fitness score and cardio fitness level, which shows how you compare to your peers. In the Fitbit app, tap the Heart-rate tile and swipe left on your heart-rate graph to see your detailed cardio fitness stats. For more information, see the related help article. Share your activity After you complete a workout, open the Fitbit app to share your stats with friends and family. For more information, see the related help article. 30 Update, Restart, and Erase Some troubleshooting steps may require you to restart your tracker, while erasing it is useful if you want to give FB424 to another person. Update your tracker to receive the latest firmware. Update FB424 Update your tracker to get the latest feature enhancements and product updates. When an update is available, a notification appears in the Fitbit app. After you start the update, follow the progress bars on FB424 and in the Fitbit app until the update is complete. Keep your tracker and phone close to each other during the update. To update FB424, your tracker's battery must be at least 20% charged. Updating FB424 may be demanding on the battery. We recommend plugging your tracker into the charger before starting an update. For more information, see the related help article. Restart FB424 If you cant sync FB424 or you have trouble with tracking your stats or receiving notifications, restart your tracker from your wrist:

1. Swipe down from the clock screen to find the Settings app. 2. Open the Settings app Restart Device Restart. If FB424 is unresponsive:

1. Connect FB424 to the charging cable. For instructions, see "Charge your tracker " on page . 2. Place FB424 on its charger, then press and hold the buttons on your tracker for 10 seconds. Release the buttons. When you see the Fitbit logo appear and FB424 vibrates, the tracker restarted. Restarting your tracker doesn't delete any data. Erase FB424 If you want to give FB424 to another person or wish to return it, first clear your personal data:

1. Swipe down from the clock screen to find the Settings app. 31 Clear User Data. 2. Open the Settings app 3. Swipe up, then press Hold 3 Sec for 3 seconds and release. 4. When you see the Fitbit logo and FB424 vibrates, your data is erased. Device Info 32 Troubleshooting If FB424 isn't working properly, see our troubleshooting steps below. Heart-rate signal missing FB424 continuously tracks your heart rate while you're exercising and throughout the day. If the heart-rate sensor on your tracker has difficulty detecting a signal, dashed lines appear. If your tracker doesn't detect a heart-rate signal, make sure you're wearing your tracker correctly, either by moving it higher or lower on your wrist or by tightening or loosening the band. FB424 should be in contact with your skin. After holding your arm still and straight for a short time, you should see your heart rate again. For more information, see the related help article. Other issues If you experience any of the following issues, restart your tracker:

Won't sync Won't respond to taps or swipes Won't track steps or other data Won't show notifications For instructions, see "Restart FB424" on page . 33 General Info and Specifications Sensors and Components Fitbit FB424 contains the following sensors and motors:

3-axis accelerometer, which tracks motion patterns Optical heart-rate tracker Ambient light sensor Vibration motor Materials The FB424 classic band is made of a flexible, durable elastomer material similar to that used in many sports watches. The housing and buckle on FB424 are plastic. Wireless technology FB424 contains a Bluetooth 5.1 radio transceiver. Haptic feedback FB424 contains a vibration motor for alarms, goals, notifications, reminders, and apps. Battery FB424 contains a rechargeable lithium-polymer battery. Memory FB424 stores your data, including daily stats, sleep information, and exercise history, for 7 days. See your historical data in the Fitbit app. Display FB424 has a color AMOLED display. 34 Band size Band sizes are shown below. Note that accessory bands sold separately may vary slightly. Small band Fits a wrist between 5.5 - 7.1 inches (140 mm - 180 mm) in circumference Large band Fits a wrist between 7.1 - 8.7 inches (180 mm - 220 mm) in circumference Environmental conditions Operating temperature 32 to 104 F

(0 to 40 C) Water resistance Water resistant up to 50 meters Maximum operating altitude 28,000 feet

(8,534 m) Learn more To learn more about your tracker, how to track your progress in the Fitbit app, and how to build healthy habits with Fitbit Premium, visit help.fitbit.com. Return policy and warranty Find warranty information and the fitbit.com return policy on our website. 35 Regulatory & Safety Notices Notice to the User: Regulatory content for certain regions can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info USA: Federal Communications Commission (FCC) statement Model FB424 FCC ID: XRAFB424 Notice to the User: The FCC ID can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Suppliers Declaration of Conformity Unique Identifier: FB424 Responsible Party U.S. Contact Information 199 Fremont Street, 14th Floor San Francisco, CA 94105 United States 877-623-4997 FCC Compliance Statement (for products subject to Part 15) This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference and 2. This device must accept any interference, including interference that may cause undesired operation of the device. 36 FCC Warning Changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Connect the equipment into an outlet on a circuit different from that to which the receiver is Increase the separation between the equipment and receiver. connected. Consult the dealer or an experienced radio/TV technician for help. This device meets the FCC and IC requirements for RF exposure in public or uncontrolled environments. Canada: Industry Canada (IC) statement Model/Modle FB424 IC: 8542A-FB424 Notice to the User: The IC ID can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Avis l'utilisateur: L'ID de l'IC peut galement tre consult sur votre appareil. Pour voir le contenu:

Paramtres> propos> Informations rglementaires This device meets the IC requirements for RF exposure in public or uncontrolled environments. 37 Cet appareil est conforme aux conditions de la IC en matire de RF dans des environnements publics ou incontrle IC Notice to Users English/French in accordance with current issue of RSS GEN:

This device complies with Industry Canada license exempt RSS standard(s). Operation is subject to the following two conditions:

1. this device may not cause interference, and 2. this device must accept any interference, including interference that may cause undesired operation of the device. Cet appareil est conforme avec Industrie Canada RSS standard exempts de licence (s). Son utilisation est soumise Les deux conditions suivantes:

1. cet appareil ne peut pas provoquer dinterfrences et 2. cet appareil doit accepter Toute interfrence, y compris les interfrences qui peuvent causer un mauvais fonctionnement du dispositif European Union (EU) Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Frequency Bands and Power Data given here is the maximum radio-frequency power transmitted in the frequency band(s) in which the radio equipment operates. Bluetooth 2400-2483.5 MHz < XX dBm EIRP Simplified EU Declaration of Conformity Hereby, Fitbit LLC declares that the radio equipment type Model FB424 is in compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address: www.fitbit.com/safety 38 Vereinfachte EU-Konformittserklrung Fitbit LLC erklrt hiermit, dass die Funkgerttypen Modell FB424 die Richtlinie 2014/53/EU erfllen. Der vollstndige Wortlaut der EU-Konformittserklrungen kann unter folgender Internetadresse abgerufen werden: www.fitbit.com/safety Declaracin UE de Conformidad simplificada Por la presente, Fitbit LLC declara que el tipo de dispositivo de radio Modelo FB424 cumple con la Directiva 2014/53/UE. El texto completo de la declaracin de conformidad de la UE est disponible en la siguiente direccin de Internet: www.fitbit.com/safety Dclaration UE de conformit simplifie Fitbit LLC dclare par la prsente que les modles dappareils radio FB424 sont conformes la Directive 2014/53/UE. Les dclarations UE de conformit sont disponibles dans leur intgralit sur le site suivant : www.fitbit.com/safety Dichiarazione di conformit UE semplificata Fitbit LLC dichiara che il tipo di apparecchiatura radio Modello FB424 conforme alla Direttiva 2014/53/UE. Il testo completo della dichiarazione di conformit UE disponibile al seguente indirizzo Internet: www.fitbit.com/safety Argentina C-XXXXX 39 Australia and New Zealand Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Belarus Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Customs Union Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info 40 Ghana Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info India Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Indonesia XXXXX/SDPPI/XXXX XXXX Israel Japan

. XX-XXXXX Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info R XXX-XXXXXX 41 Kingdom of Saudi Arabia Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Malaysia Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Mexico Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info La operacin de este equipo est sujeta a las siguientes dos condiciones:

1. Es posible que este equipo o dispositivo no cause interferencia perjudicial y 2. Este equipo o dispositivo debe aceptar cualquier interferencia, incluyendo la que pueda causar su operacin no deseada IFT#: XXXXXXX-XXXX 42 Morocco AGREE PAR LANRT MAROC Numro dagrment: MR XXXXX ANRT XXXX Date dagrment: XX/XX/XXXX Nigeria Connection and use of this communications equipment is permitted by the Nigerian Communications Commission. Oman TRA/TA-R/XXXX/XX D090258 Paraguay NR: XXXX-XX-X-XXXX 43 Philippines NTC Type Accepted No: ESD-XXXXXXXX Serbia Singapore Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info South Korea Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info 44 Taiwan

Translation:

Notice to the User: Regulatory content can also be viewed on your device. Instructions to view content from your menu:

Settings > Device Info > Regulatory Info Translation:

Low Power Warning:

For the low-power radio frequency equipment that has obtained the verification certificate, the company, organization or user shall not change the frequency, increase the power or change the features and functions of the original design without approval. The use of low-power radio frequency equipment shall not affect flight safety or interfere with legal communications. If any interference is detected, the device should be disabled immediately and the interference removed before continuing use. The aforesaid legal communication refers to the radio communication operated in accordance with the provisions of the Telecommunications Management Act. Low power radio frequency equipment must accept interference from legal communication or radio wave radiated electrical equipment for industrial, scientific and medical use. 45 Translation:

Battery warning:

This device uses a lithium-ion battery. If the following guidelines are not followed, the life of the lithium-ion battery in the device may be shortened or there is a risk of damage to the device, fire, chemical burn, electrolyte leakage and

/ or injury. Do not disassemble, puncture or damage the device or battery. Do not remove or try to remove the battery that the user cannot replace. Do not expose the battery to flames, explosions or other hazards. Do not use sharp objects to remove the battery. Vision Warning 3010221 Translation:

Excessive use may damage vision Warning:

Excessive use may damage vision Attention:

Rest for 10 minutes after every 30 minutes. Children under 2 years old should stay away from this product. Children 2 years old or more should not see the screen for more than 1 hour a day. 46 Taiwan RoHS Part Name: Wireless Activity Tracker Restricted Substances and its chemical symbols Model FB424

(Strap and Buckle)

(Electronics)

(Housing)

(Charging Cable)

(Pb)

(Hg)

(Cd)

(Cr+6)

(PBB)

(PBDE) O

O O O O O O O O O O O O O O O O O O O O O O 1.0.1 wt %0.01 wt %

2. 3. Thailand 47 United Arab Emirates TDRA United Arab Emirates Dealer ID: DA35294/14 TA RTTE: ERXXXXX/XX Model: FB424 Type: Wireless Activity Tracker United Kingdom Notice to the User: Regulatory content for this region can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Simplified UK Declaration of Conformity Hereby, Fitbit LLC declares that the radio equipment type Model FB203 is in compliance with Radio Equipment Regulations 2017. The full text of the UK declaration of conformity is available at the following internet address: www.fitbit.com/legal/safety-instructions Vietnam I T B T F I X X X X X X X X X X X X X X X X 48 About the Battery This unit contains a non-replaceable internal lithium-ion battery. The battery can burst or explode, releasing hazardous chemicals. To reduce the risk of fire or burns, do not disassemble, crush, puncture or dispose of in fire or water CAUTION: Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the instructions. The battery must be recycled or disposed of properly Use the battery only in the specified equipment Do not leave the battery in an extremely high temperature environment that may result in an explosion or the leakage of flammable liquid or gas Do not subject battery to extremely low air pressure that may result in an explosion or the leakage of flammable liquid or gas IP Rating Notice to the User: Regulatory content can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info Model FB424 has a water resistance rating of IPX8 under IEC standard 60529, up to a depth of 50 meters. Model FB424 has a dust ingress rating of IP6X under IEC standard 60529, which indicates the device is dust-tight. Safety Statement This equipment has been tested to comply with safety certification in accordance with the specifications of: IEC 62368-1: 2014, EN62368-1:2014 + A11:2017, BS EN62368-1:2014

+A11:2017. 49 Regulatory Markings Device regulatory markings can be viewed on your device by removing the band. Markings are located in the band attach area. 50

E-label Declaration FCC ID: XRAFB424 FCC 2.935 Electronic labeling of radiofrequency devices.

(a) Any radiofrequency device equipped with an integrated electronic display screen, or a radiofrequency device without an integrated screen that can only operate in conjunction with a device that has an electronic display screen, may display on the electronic display the FCC Identifier, any warning statements, or other information that the Commissions rules would otherwise require to be shown on a physical label attached to the device. Information FCC ID number 15.19 Statement (This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.) Class B Digital Device user manual statement Caution to the user that changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment Image of the e-label screen is provided below:

On e-label Yes Yes In Manual Yes Yes No No Yes Yes

(b) Devices displaying their FCC Identifier, warning statements, or other information electronically must make this information readily accessible on the electronic display. Users must be provided with prominent instructions on how to access the information in the operating instructions, inserts in packaging material, or other easily accessible format at the time of purchase. The access instructions may also be provided via the product-related website, if such a web site exists; the packaging material must provide specific instructions on how to locate the website information, and a copy of these instructions must be included in the application for equipment certification. The instruction on how to access the information is in the online version of the User Manual:

Notice to the User: The FCC ID can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info

(c) Devices displaying their FCC Identifier, warning statements, or other information electronically must permit access to the information without requiring special codes, accessories or permissions and the access to this information must not require more than three steps from the device setting menu. The number of steps does not include those steps for use of screen locks, passcodes or similar security protection designed to control overall device access. No special accessories or supplemental plug-ins are required to access the information. Notice to the User: The FCC ID can also be viewed on your device. To view the content:

Settings > Device Info > Regulatory Info

(d) The electronically displayed FCC Identifier, warning statements, or other information must be displayed electronically in a manner that is clearly legible without the aid of magnification. Yes

(e) The necessary label information must be programmed by the responsible party and must be secured in such a manner that third-parties cannot modify it. The e-label information is pre-programmed by the grantee. The user cannot modify the e-label information.

(f) Devices displaying their FCC Identifier, warning statements, or other information electronically must also be labeled, either on the device or its packaging, with the FCC Identifier or other information (such as a model number and identification of a webpage that hosts the relevant regulatory information) that permits the devices to be identified at the time of importation, marketing, and sales as complying with the FCCs equipment authorization requirements. Devices can be labeled with a stick-on label, printing on the packaging, a label on a protective bag, or by similar means. Any removable label shall be of a type intended to survive normal shipping and handling and must only be removed by the customer after purchase. The FCC ID is present on the product packaging.

Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 July 27, 2022 Subject:

FCC ID:

To Whom It May Concern:

Pursuant to the provisions of Sections 0.457 and 0.459 of the Commissions rules (47 C.F.R. 0.457, 0.459), we request that the Commission withhold the following attachments as confidential documents from public disclosure indefinitely. Request for Confidentiality XRAFB424 FB424_Schematic.pdf FB424_Block diagram.pdf FB424_OpDes.pdf In support of this request, we provide the following information:

1. Identification of the specific information for which confidential treatment is sought ( 0.459(b)(1)): We request that all of the information contained in the above-referenced exhibits to the certification application be withheld from routine public disclosure. 2. Identification of the Commission proceeding in which the information was submitted or a description of the circumstances giving rise to the submission ( 0.459(b)(2)): The material is being submitted in connection with our certification application for the above-captioned FCC ID. 3. Explanation of the degree to which the information is commercial, or financial or contains a trade secret or is privileged ( 0.459(b)(3)): The market for the technology that is the subject of the certification application is highly competitive, with numerous companies competing for the business of potential customers. Were competitors to become aware of the facts set forth in the above-referenced exhibits to the application at this time, it could have an adverse impact on our competitive standing and deprive us of the marketplace benefit we otherwise might achieve by virtue of having the product available before other competitors. If any of the information for which confidential treatment is sought was made publicly available, competitors could reasonably determine the scope and status of our activities. 4. Explanation of the degree to which the information concerns a service that is competitive ( 0.459(b)(4)): The technology that is the subject of the certification application is subject to intense competition from other manufacturers and service providers that are developing competing services and technology. 5. Explanation of how disclosure of the information could result in substantial competitive harm ( 0.459(b)(5)):

As noted above, were our competitors to become aware of the facts set forth in the above-referenced exhibits to the application, it could have an adverse impact on our competitive standing and deprive us of the marketplace benefit we otherwise would achieve by virtue of having the product available before other providers. 6. Identification of any measures taken by the requesting party to prevent unauthorized disclosure (

0.459(b)(6)): The information contained in the above-referenced exhibits to the certification application has been strictly controlled by us, with distribution limited to internal use only and for the specific purpose of conducting research, development, and testing of the technology. 7. Identification of whether the information is available to the public and the extent of any previous disclosures of the information to any third parties ( 0.459(b)(7)): The information that we request be maintained as confidential is not available publicly. The information has been protected and kept confidential by limiting external contacts to privileged and confidential communications. 8. Justification of the period during which the submitting party asserts that material should not be available for public disclosure ( 0.459(b)(8)): Given the competitive nature of the marketplace, any disclosure that we have developed the technology discussed in the above-referenced exhibits to the certification application would harm our competitive position. The information subject to this request for confidentiality should not be made available for public disclosure at any time. In addition, pursuant to Public Notice DA 04-1705, and in order to comply with the marketing regulations in 47 C.F.R. 2.803 and the importation rules in 47 C.F.R. 2.1204 while ensuring that business-sensitive information remains confidential until the actual marketing of newly authorized devices, we also request that the Commission grant temporary confidential treatment and not release the following attachments for routine public disclosure until 180 days after the grant date. FB424_External Photo.pdf FB424_Internal Photo.pdf XRAFB424_DTS_Setup.pdf, XRAFB424_SAR_Tsup.pdf FB424_User Manual.pdf It is our understanding that test measurement reports and correspondence during the certification review process cannot be granted confidential treatment, and such information will be available for public review once the grant of equipment authorization is issued. Sincerely yours, ___________________________ Angie Du Head of Compliance Engineering Fitbit LLC 199 Fremont Street, 14th Floor San Francisco, CA 94105 2

Date: July 21, 2022 To Whom It May Concern, Please be notified that I, Angie Du, have designated Jones Tsai of Sporton International Inc. as the person being responsible for this project and to sign the form 731 and other documentation. Any and all acts carried out by Jones Tsai in Sporton International Inc. on the matters of relating to all processes required in the FCC approval and any communication needed with the national authority, shall have the same legal authority as acts on our own behalf. We further certify that neither the applicant nor any party to this application, as defined in 47 CFR Ch. 1.2002 (b), is subject to a denial to Federal benefits, that include FCC benefits, pursuant to section 5301 of the Anti-Drug Abuse Act of 1998, 21 U.S.C. 862. This authorization is limited to the following product:

FCC ID: XRAFB424 If you have any acknowledgement and response, please send it to Sporton International Inc. directly. Sincerely yours, Angie Du Head of Compliance Engineering angiedu@google.com Fitbit LLC 199 Fremont Street, 14th Floor San Francisco, CA 94105