FCC ID: 2BCTX-S3 Bone conduction Bluetooth earphones

FCC Statement 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. 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. 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. The device has evaluated to meet general RF exposure requirement. The device can be used be in portable exposure without restriction.

Manufactrer: Shenzhen Yongcheng International Technology Co., LTD Address: Room 611, Building F, Yuxing Science and Technology Industrial Park, Baoan District, Shenzhen , Guangdong 2.4GHz 2012 Chip Antenna: RF201221 _ Evaluation Board Reference PCB Dimension Antenna Layout Reference TF Unit :mm Unit :mm Electrical Characteristics eturn Loss R Trc2 Trc3 dB Mag 10 dB / Ref 0 dB Invisible dB Mag 10 dB / Ref 0 dB Cal int Offs 1 Return Loss & Radiation 2.4000 2.4420 6 dB 00 GHz M 1 M 2 2 dB 00 GHz M 3 2.484000 GHz -10.243 dB

-10.77

-24.81 S11 41 31 21 11 1 0

-9

-19

-29

-39 M 1 M3 M 2 Ch1 Start 2 GHz Pwr 0 dBm Stop 3GHz Radiation Frequency

(MHz) 2400 2442 2484 S11 (dB)

-10.78

-24.81

-10.24 2.4GHz 2012 Chip Antenna: RF201221 Taping Specifications _ Reel Specification Reel and Taping Specification TYPE SIZE A B C D W M 2012 7 5K/Reel 2.00.5 13.51.0 211.0 601.0 11.52.0 1782.0 Tapping Specification Packaging Type A B W E F G H T Paper Type 3216 1.900.20 3.500.20 8.00.20 1.750.10 3.50.05 4.00.10 2.00.05 0.750.10 D

+0.10 P 1.50

-0 4.00.1 2.4GHz 2012 Chip Antenna: RF201221 Reliability Table Test Item Electrical Characterization Thermal Shock Temperature Cycling High Temperature Exposure Low Temperature Storage Procedure 1. Preconditioning:

50 10 / 1 hr , then keep for 24 1 hrs at room temp. 2. Initial measure: Spec: refer Initial spec. 3. Rapid change of temperature test:

-30 to +85; 100 cycles;

15 minutes at Lower category temperature;

15 minutes at Upper category temperature. 1. Initial measure: Spec: refer Initial spec. 2. 100 Cycles (-30 to +85), Soak Mode=1 (2 Cycle/hours). 3. Measurement at 24 2Hours after test condition. 1. Initial measure: Spec: refer Initial spec. 2. Unpowered; 500hours @ T=+85. 3. Measurement at 24 2 hours after test. 1. Initial measure: Spec: refer Initial spec. 2. Unpowered: 500hours @ T= -30. 3. Measurement at 24 2 hours after test. Solderability

(SMD Bottom Side) Dipping method:

a. Temperature: 235 5C b. Dipping time: 3 0.5s Soldering Heat Resistance

(RSH) Vibration Mechanical Shock Preheating temperature: 150 10C. Preheating time: 1~2 min. Solder temperature: 260 5C. Dipping time: 5 0.5s 5g's for 20 min., 12 cycles each of 3 orientations Note: Use 8"X5" PCB .031" thick 7 secure points on, one long side and 2 secure points at corners of opposite sides. Parts mounted within 2" from any secure point. Test from 10-2000 Hz. Three shocks in each direction shall be applied along the three mutually perpendicular axes of the test specimen (18 shocks) Peak value: 1,500gs Duration: 0.5ms Velocity change: 15.4 ft/s Waveform: Half-sine _ Remark

(Reference) User Spec. MIL-STD-202 107 Requirements Ceramic Type Fulfill the electrical specification No Visible Damage. Fulfill the electrical specification. No Visible Damage. Fulfill the electrical specification. No Visible Damage. Fulfill the electrical specification. No Visible Damage. Fulfill the electrical specification. The solder should cover over 95% of the critical area of bottom side. No Visible Damage. JESD22 JA104 MIL-STD-202 108 MIL-STD-202 108 IEC 60384-21/22 4.10 IEC 60384-21/22 4.10 No Visible Damage. MIL-STD-202 Method 204 No Visible Damage. MIL-STD-202 Method 213 Humidity Bias 1. Humidity: 85% R.H., Temperature: 85 2 C. 2. Time: 500 24 hours. 3. Measurement at 24 2hrs after test condition. No Visible Damage. Fulfill the electrical specification. MIL-STD-202 Method 106 2.4GHz 2012 Chip Antenna: RF201221 Board Flex

(SMD) 1. Mounting method:

No Visible Damage. IR-Reflow. PCB Size (L:100 W:40 T:1.6mm) 2. Apply the load in direction of the arrow until bending reaches 2 mm. _ AEC-Q200 005 Adhesion Force of 1.8Kg for 60 seconds. AEC-Q200 006 No Visible Damage Magnification of 20X or greater may be employed for inspection of the mechanical integrity of the device body terminals and body/terminal junction. Physical Dimension Any applicable method using x10 magnification, micrometers, calipers, gauges, contour projectors, or other measuring equipment, capable of determining the actual specimen dimensions. In accordance with specification. JESD22 JB100 Revision History Revision Date Content 1 2 3 2015/8/20 New issue 2017/4/20 Update detail dimension on antenna layout 2018/3/1 Part number and coding rule updated

SHENZHEN YUZHEN TECHNOLOGY CO.LTD Date: 2023/10/23 Product Model Number: S3, EP410 FCC ID: 2BCTX-S3 To whom it may concern, Re: Product Certification Representative Authorization Letter We authorize QAI Laboratories Ltd. 3980 North Fraser Way, Burnaby B.C. Canada V5J 5K5 to act on our behalf on all matters concerning the above named equipment. This shall include the following:

Testing Approval applications and procedures We declare that ORGANIZATION.is allowed to forward all information related to the approval project to the applied certification body and to the notification entities and to discuss any issues concerning the approval application. Any and all acts carried out by ORGANIZATION. on our behalf shall have the same effect as acts of our own. By:

Title: Liangfu Liu Email:Kingboys2046@163.com Telephone: 13760213275 On behalf of: Liangfu Liu

SHENZHEN YUZHEN TECHNOLOGY CO.LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject; Request for Confidentiality FCC ID: 2BCTX-S3 To Whom It May Concern, Date: October 23, 2023 Pursuant to the provisions of the Commissions rules Title 47 Sections 0.457 and 0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR 2.803 and the importation rules in Title 47 CFR 2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s);

External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature:

Name: Liangfu Liu Title: Manager

SHENZHEN YUZHEN TECHNOLOGY CO.LTD Model Different Model nameBone conduction Bluetooth earphones FCC ID: 2BCTX-S3 Model number: S3, EP410 All models the function, software and electric circuit are the same, except the model number. Name:Liangfu Liu Date: 2023-10-23 Title: Manager Signature of applicant:

SHENZHEN YUZHEN TECHNOLOGY CO.LTD Address6A, No.72, Second Lane, Dazhonggang Road, Shaqi Community, Xinqiao Street, Bao'an District, Shenzhen Date: 2023-10-23 Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements Part 2.911(d)(7) Filing SUBJECT: FCC Application for FCC ID: 2BCTX-S3 FRN:0034227207 SHENZHEN YUZHEN TECHNOLOGY CO.LTD certifies that, as of the date of the filing of the application, UA INTERNATIONAL INC. is our designated U.S. agent for service of process for the above referenced FCC ID. SHENZHEN YUZHEN TECHNOLOGY 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. UA INTERNATIONAL INC. 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: UA INTERNATIONAL INC. Address: 5030 Boardwalk Dr Suite 818 Colorado Springs, COLORADO 80919, USA FRN:0033510736 Contact Person: Jessica Zhong Tel.: 001-719-6787182 Email: customerservice@hotmail.com Sincerely, Signed on behalf of Signed on behalf of SHENZHEN YUZHEN TECHNOLOGY CO.LTD UA INTERNATIONAL INC. Name: Liangfu Liu Name:Jessica Zhong Title: Manager Signature:

Title: Manager Signature:

Date: 2023-10-23 Date: 2023-10-23

SHENZHEN YUZHEN TECHNOLOGY CO.LTD Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 10-23-2023 FCC ID: 2BCTX-S3 Ref. #1: Attestation Statements Part 2.911(d)(5)(i) Filing SHENZHEN YUZHEN TECHNOLOGY 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. Ref. #2: Attestation Statements Part 2.911(d)(5)(ii) Filing SHENZHEN YUZHEN TECHNOLOGY 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. Applicant: SHENZHEN YUZHEN TECHNOLOGY CO.LTD Address: 6A, No.72, Second Lane, Dazhonggang Road, Shaqi Community, Xinqiao Street, Bao'an District, Shenzhen Contact Person: Liangfu Liu Tel.: Manager Email:Kingboys2046@163.com Sincerely, Signature: