Operating instruction of SD251-BT/BT251-BK I. Functions of keys Power On: Press center key for 3 seconds Power Off: Press center key for 3 seconds Volume Up: Short press "+" key Volume Down: Short press "-" key Next Track: Long press "+" key. Previous Track: Long press "-" key Play the Track: Press "center" key once Pause the Track: Press "center" key once Answer incoming call: Press "center" key once Refuse incoming call: Press "center" key twice End the call: Press "center" key once Last number Redial: Press "center" key twice Activate Siri: Press "center" key thrice MIC: Microphone USB: micro USB charging port II. Charging The Bluetooth headset has a built-in rechargeable battery and the battery power of a new headset is not enough; please charge for at least 1.5 hours to make the battery power enough before the first use. Hereafter, charging will take about 1 hour. While it is charging, the red light is on; while the charging is saturated, the red light will be off . III. Pairing of headset and Bluetooth device The Bluetooth headset must be paired with your mobile phone (or other Bluetooth devices) before use. 1. When the headset is in power-off state, please press center key to power on, will hear the voice prompt power on and pairing. 2. Search the Bluetooth device on your Bluetooth headset (please refer to the mobile phone instructions for detailed process). When the search is finished, you will find a new device called "SD251-BT" in the device list. 3. Select SD251-BT which will be automatically paired and connected with mobile phone; when the pairing connection is successful, will hear the voice prompt connected Notes:
In the process of pairing, some mobile phone requires inputting pairing password, please input "0000";
The headset will automatically shut down if it cannot find the paired device in 3-5 minutes;
If the Bluetooth headset is not in the pairing state, your mobile phone or other Bluetooth devices will not be able to search to the headset, please set the headset to the pairing state and then use the mobile phone to search again. IV. Bluetooth wireless call When the Bluetooth headset is paired and connected with your mobile phone, you can use the headset to answer the phone or listen to the stereo music played mobile phone.
(1) Dial-out, answer and hang up of calls by mobile phone Outgoing calls 1. Dial-out by mobile phone: Use your mobile phone to dial according to the way as usual, after dialing out, the headset will make a ringing tone, the voice will be automatically switched to the Bluetooth headset after putting through. (Some smart phones need to have a choice.) 2. Last number redial: Double-click the center key to dial out the last dialing phone number. Answering and hanging up calls When a call comes in, you will hear a phone prompt sent by the headset. 1. When the phone rings, press center key once or press the phone answer key to answer the phone. 2. When the phone rings, press center key twice to refuse the phone. 3. If you are in call, long press + to increase the headset volume, and long press to decrease the headset volume. 4. Short press center key, phone hang-up key or hang up by the other end to end the call, if the mobile phone is connected with playing stereo music, the phone will continue to play the music after ending the call. V. Wireless stereo music playing The paired mobile phone shall support Bluetooth A2DP. 1. When the music is played, long press - to make the music jump to the previous song.. 2. When the music is played, long press + to make the music jump to the next song. 3. When the music is played, press center key to stop the music, and then press center to continue playing the 4.When the music is played, long press + to increase the headset volume, and long press - to decrease the music. headset volume. 5. During the stereo playing, if there is dial-up or call, the stereo playing will be automatically suspended, and the stereo music will continue to be played at the end of the phone. VI. Low voltage automatic detection and power off When the machine voltage is less than 3.3V, the red light will flash, will hear the battery low voice prompt. When the voltage is less than 3V, the headset will automatically power off. Please recharge in time. VII. Battery power indication:
Paired IPHONE mobile, it will have headset battery power indication. VIIIPacking list :
1.SD251-BT Earphone headset 1pcs 2.USB charge cable 1pcs 3.Proudct user manual 1pcs Product specification and parameters:
transmission Product name Product model Version Frequency range Wireless standard Channel Connection type Transmitting range Frequency response Signal to Noise Ratio Audio power output Status indication Applicable product pairing Support decoder Battery Charging time Charging power supply Operating time Standby time Product size Bluetooth stereo earphone SD251-BT/BT251-BK Bluetooth V5.0 (QCC3005) 2.402GHZ~2.480GHZ ISM Band CLASS 2 79channels of 1Mhz BW Point-to-point
<=10M (free space) 20HZ-20KHZ
>82db 2X3mW Red and blue bi-color indicator light USB Bluetooth adapter, Bluetooth mobile phone, IPAD, MID, etc in accordance with HFP, HSP, A2DP, AVRCP Bluetooth protocols APTX/AAC/SBC Polymer lithium-ion battery 3.7V 110mAH 1 hour Computer USB 5V; Charger of output DC 5V 500mA About 4.5 hours ( Battery saturation state) More than 150 hours ( Battery saturation state) To prevent possible hearing damage, do not listen at high volume levels for long periods. A warning that batteries (battery pack or batteries installed) shall not be exposed to excessive heat Such as sunshine , fire or the like. CAUTION Danger of explosion if battery is incorrectly replaced Replace only with the same or equivalent type. FCC Statement 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. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Radiation Exposure Statement This device complies with FCC radiation exposure limits set forth for an uncontrolled environment and it also complies with Part 15 of the FCC RF Rules. This equipment must not be co-located or operating in conjunction with any other antenna or transmitter. End-users and installers must be provide with antenna installation instructions and consider removing the no-collocation 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. Caution!
Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.