FCC ID: 2AVYG-SEESAW19 True Wireless Earphone

USERS MANUAL Seesaw Wireless Earphones Welcome to Card 21 Wireless Earphones!

In order to let you understand Card 21 more quickly , please read the following instructions carefully. Product Diagram The package box contains a charging case, a pair of wireless earphones and a charging cable Operation You can refer to this instruction to perform the following operations on the wireless earphone. 1. Turn on and Turn off Turn on Method 1: When the charging case has residual power, open the charging case earphone and it will turnon automatically;

Method 2: Long press the operation area for 2 seconds when the phone is turned off, and the earphone will turn on When starting up, the white light will be on for 1 second and then off, and the voice prompt will be "Power on"

Turn off Method 1: Put the earphone into the charging chamber and it will automatically shut down. Method 2: When the terminal device is not connected, the earphone will automatically shut down after 3 minutes or long pressing the touch area for 6 seconds. Indicator light: red light goes on for 2 seconds and then goes off Voice reminder: before power off, voice prompt "Power off"

2. Pairing Pairing includes the pairing between the left and right earphones, and the connection between the earphones and the terminal device. Pairing between left and right earphones The two earphones can be paired automatically after power on. Indicator light before pairing: red light and white light flash alternately. Indicator light after pairing: white light flashes, and voice will prompt with "Du"

sound. Connection to terminal equipment Bluetooth on the end device turned on After the earphone is turned on, search for the Bluetooth signal on the terminal device , select the corresponding earphone signal name, and then select Connect to pair with the terminal device. Earphone indicator light: After pairing is complete, the indicator light goes out After the earphone successfully completes a connection with the terminal device, the earphone will automatically find the terminal device that was successfully connected last time when it is used again, and try to connect with it. 3. Play music or audiobooks Play / Pause Double tap on any earbud to play or pause music Indicator light: no prompt Switch up and down Previous song: Touch the touch area of the left earphone 3 times Next song: Touch the touch area of the right earphone 3 times Adjust the volume Increase volume: Operate the touch area of the right earphone in the way of interval touch, each touch , the volume of the earphone will increase by 1 unit Decrease the volume: Operate the touch area of the left earphone in the way of interval touch, each touch , the volume of the earphone will increase by 1 unit Voice assistant on/off Turn on the voice assistant: touch any earphone touch area 4 times Turn off the voice assistant: touch the touch area of any earphone twice When using the voice assistant, the indicator light has no prompt, and the prompt sound comes from the terminal device 4. Calls answering call Touch any earphone touch area once. Indicator light: When there is an incoming call, the white light flashes quickly, and goes off after the call is connected The prompt tone comes from the terminal device End call Touch any earphone touch area twice When the call ends, there is no indicator light, and the voice prompt is "Du"

Reject call Long press any earphone for 2 seconds When rejecting a call, there is no indication on the indicator light, and the voice prompt is "Du"

5. Mode switching Long press any earphone for 1.5 seconds Once every 1.5 seconds, the earphone will switch from one mode to another, in the order of active noise reduction mode transparent mode music mode active noise reduction mode, and so on. 6. Restore factory settings After the earphone is turned on, touch the touch areas of the two earphones 5 times in a row without connecting to the terminal device, the white light will go out after flashing 5 times, and return to the factory settings. Charging case indicator light When the charging case is charging, the indicator light corresponding to the power level will flash, and the indicator light will go out when fully charged 6. Charging the earphone or charging case earphone charging When the charging case has remaining power, put it into the charging compartment and close the cover to automatically charge Indicator light: The white light of the earphone is always on, and it will go out when fully charged Earphone low battery reminder : the white light flashes twice every 30 seconds Charging case charging Indicator light of the charging case: The red light blinks when the charging box is charging. When fully charged, the red light is on Reminder of low charge of the charging case: When the battery is less than 5%, when the headset is put into the charging bay, blink 4S and then turn off. Reminder of overheating of charging case temperature: the red indicator flashes 3 times every 3 seconds until it returns to normal temperature. The main parameters Model Seesaw Dynamic unit size

=10mm Earphone battery level 35mAh*2 Earphone single play time 4-5 hours Charging case battery 390mAh Cumulative playback time about 20 hours Input Voltage/Current 5V/0.3A Precautions 1. Try to use the minimum volume that meets the needs. Long-term high-volume use will cause permanent hearing damage. 2. Please keep the device and accessories out of the reach of children, and children should use the device under adult supervision. 3. Do not immerse the device in water for a long time. Avoid using this product while swimming, diving, diving or showering. 4. Do not use this product in places with humidity, dust, or near magnetic fields, so as not to cause internal circuit failure. 5. Avoid storing the earphones in an environment below -15C or above 50C. 6. Avoid charging the earphone or charging case in an environment below 0C. 7. Do not place the earphones on windowsills, car dashboards and other places exposed to direct sunlight for a long time. 8. Do not disassemble, modify the device, or insert foreign objects into the device, as these may cause damage to the device. FCC Compliance Notice 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. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 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 FCC Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment . This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

ATTESTATION STATEMENT Applicant: Yibai Science & Technology (Shenzhen) Co., Ltd. Add:No. 1112, Building 5A, Tusincere Technology Park,Huanggekeng Community Longcheng Street,Longgang,Shenzhen,China TEL: 13502890859 E-mail: gky@yobybo.com Date: 2023-08-22 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements Part 2.911(d)(5)(i), (ii) Filing FCC ID: 2AVYG-SEESAW19 Yibai Science & Technology (Shenzhen) Co., Ltd. certifies that the equipment for which authorization is sought is not covered equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. And Yibai Science & Technology (Shenzhen) Co., Ltd. certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing covered equipment. Sincerely, Signed by (printed name): Keyu Guo Title: Manager Signature:

Applicant: Yibai Science & Technology (Shenzhen) Co., Ltd. Add:No. 1112, Building 5A, Tusincere Technology Park,Huanggekeng Community Longcheng Street,Longgang,Shenzhen,China TEL: 13502890859 E-mail: gky@yobybo.com Date: 2023-08-22 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir/Madam, We, Yibai Science & Technology (Shenzhen) Co., Ltd. hereby authorize China Certification ICT Co., Ltd (Dongguan) to act as a laboratory for testing and test report generation for the following project(s):

(Product description: True Wireless Earphone,model: Seesaw19 FCC ID: 2AVYG-SEESAW19) The Chip supports BDR(GFSK), EDR(/4-DQPSK, 8DPSK), BLE(1Mbps, 2 Mbps)function,but this product only support BDR(GFSK), EDR(/4-DQPSK), BLE

(1 Mbps, 2Mbps). 8DPSK has been shielded by software,and the end user doesn't have the capability to active it. The right headset and left headset have the same circuit diagram, PCB layout and key components. Right Board Left Board Sincerely, Signature:

Printed Name: Keyu Guo Title: Manager

Yibai Science & Technology (Shenzhen) Co., Ltd. Add:No. 1112, Building 5A, Tusincere Technology Park,Huanggekeng Community Longcheng Street,Longgang,Shenzhen,China TEL: 13502890859 E-mail: gky@yobybo.com FCC Authorization Date: 2023-08-22 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern:

We , Yibai Science & Technology (Shenzhen) Co., Ltd. Hereby authorizes China Certification ICT Co., Ltd (Dongguan) to act on its behalf in all matters relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by China Certification ICT Co., Ltd (Dongguan) on our behalf shall have the same effect as our own action. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. This authorization is valid until further written notice from the applicant. Sincerely Yours, Clients signature Printed Name: Keyu Guo Title: Manager Signature:

QA-FR-170-B

Yibai Science & Technology (Shenzhen) Co., Ltd. Add:No. 1112, Building 5A, Tusincere Technology Park,Huanggekeng Community Longcheng Street,Longgang,Shenzhen,China TEL: 13502890859 E-mail: gky@yobybo.com FCC Confidential Authorization Date: 2023-08-22 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: 2AVYG-SEESAW19 In accordance with Sections 0.457 and 0.459 of the Commissions Rules, (Yibai Science &

Technology (Shenzhen) Co., Ltd.) hereby requests long-term confidential treatment of information accompanying this application as outlined below:

Block Diagram Schematics Operation Description The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely, Signature:

Printed Name: Keyu Guo Title: Manager QA-FR-171-A

Yibai Science & Technology (Shenzhen) Co., Ltd. Add:No. 1112, Building 5A, Tusincere Technology Park,Huanggekeng Community Longcheng Street,Longgang,Shenzhen,China TEL: 13502890859 E-mail: gky@yobybo.com Date: 2023-08-22 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir or Madam:

We, Yibai Science & Technology (Shenzhen) Co., Ltd. hereby submits FCC ID:2AVYG-SEESAW19, justification for placing the FCC ID label to charging box. According to the FCC Regulation and Guidence (KDB Publication 784748 D01 v09R01) allows for the FCC to be removed to charging box if the device is Unquestionably too small for the FCC ID label to be printed. The measurement of headset:Length33(mm)*Width20 (mm)*High15(mm), label:Length35(mm)*14Width(mm), charging box:70(mm)*45(mm)*28(mm).Refer to the above quote,as the headset are too small for the ID label to be printed, so the ID label will be moved to the charging box. For details, please see below photos:

Headset Label Charging box Signature:

Printed Name: Keyu Guo Title: Manager

U.S. AGENT LETTER OF ATTESTATION Date: 2023-08-22 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID: 2AVYG-SEESAW19 Yibai Science & Technology (Shenzhen) Co., Ltd. certifies that, as of the date of the filing of the application, THREE STONES MEDIA LLC is our designated U.S. agent for service of process for the above referenced FCC ID. Yibai Science & Technology (Shenzhen) Co., Ltd. accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. THREE STONES MEDIA LLC accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent Information:

Name: THREE STONES MEDIA LLC Address: 1200 Broadway St. APT 329, Los AngelesCA90015, USA FRN: 0033401761 Tel.: +1 267 909 3692 Email: abbyzhangmedia@gmail.com Signed by (printed name): Sijie Zhang Signature:

Applicant: Yibai Science & Technology (Shenzhen) Co., Ltd. Add: No. 1112, Building 5A, Tusincere Technology Park.Huanggekeng Community Longcheng Street,Longgang District.Shenzhen,China FRN:0029342953 Tel: 13502890859 Email: gky@yobybo.com Signed by (printed name): Keyu Guo Signature: