2BVRK-WS04Wireless Earphones

Shenzhen Yichen E-commerce Co.,Ltd Covered Equipment Certification Attestation Letter 5/9/2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: 2BVRK-WS04 Shenzhen Yichen E-commerce Co.,Ltd (“the applicant”) 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. Note: If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, the applicant should include an explanation on why the equipment is not “covered” equipment. Shenzhen Yichen E-commerce Co.,Ltd (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Shenzhen Yichen E-commerce Co.,Ltd (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Signed: Printed name: Winnie Yu Title: Manager Company Name: Shenzhen Yichen E-commerce Co.,Ltd Date: 5/9/2026

Shenzhen Yichen E-commerce Co.,Ltd U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: May 09, 2026 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2BVRK-WS04 Shenzhen Yichen E-commerce Co.,Ltd(“the applicant”) certifies that, as of the date of the filing of the application, CLF Import and Export Limited (“the agent”) is our designated U.S. agent for service of process for the above reference FCC ID. The applicant accepts to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. The applicant further acknowledges it is our responsibility to inform the FCC whenever the agent information changes. CLF Import and Export Limited ("the agent) understand it is the agent's obligation to accept service of process in the United States for matters related to the applicable equipment, and at the physical U.S. address and email address. Designated U.S. Agent Company Name: CLF Import and Export Limited FRN: 0033489683 Address: 1312 17th Street #692, Denver, CO 80202, United States Signature: Contact Person: David Chen Tel: +1 949 254 2565 Email: [email protected] Applicant Shenzhen Yichen E-commerce Co.,Ltd FRN: 0038325809 Address: Building 2901-08, Xinghe WORLD-F, No.1 Yabao Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen, Guangdong, China Signature: Contact Person: Winnie Yu Tel: +86-18665890441 Email: [email protected]

DATE: May 09, 2026 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 Authority to Act as Agent On our behalf, I appoint Shenzhen CCUT Quality Technology Co., Ltd. (1F, Building 35, Changxing Technology Indstrl Park Changzhen Community, Yutang Street,Shenzhen,China) to act as our agent in the preparation of this application for equipment certification. I certify that submitted documents properly describe the device or system for which equipment certification is sought. I also certify that each unit manufactured, imported or marketed, as defined in the Federal Communications Commission’s regulations will have affixed to it a label identical to that submitted for approval with this application. For instances where our authorized agent signs the application for certification on our behalf, I acknowledge that all responsibility for complying with the terms and conditions for certification, still resides with Shenzhen Yichen E-commerce Co.,Ltd (Building 2901-08, Xinghe WORLD-F, No.1 Yabao Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen, Guangdong, China). <Signature> Name: Winnie Yu Title: Manager Applicant Company: Shenzhen Yichen E-commerce Co.,Ltd

Date: May 09, 2026 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Compliance Testing, LLC to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). Sincerely, <Signature> Name: Winnie Yu Title: Manager Company: Shenzhen Yichen E-commerce Co.,Ltd

DATE: May 09, 2026 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2BVRK-WS04 Product Name: Wireless Earphones Request for Confidentiality Pursuant to Sections 0.457 and 0.459 of the commission’s rules, we hereby request that the following documents be held confidential: (List here the documents for which you are seeking confidentiality – for example ...) • Schematics • Block diagram • Operation description These materials contain trade secrets and proprietary information and are not customarily released to the public. The public disclosure of this information might be harmful to the company and provide unjustified benefits to our competitors. <Signature> Name: Winnie Yu Title: Manager Company: Shenzhen Yichen E-commerce Co.,Ltd

Shenzhen Yichen E-commerce Co.,Ltd Model Difference Statement DATE: May 09, 2026 FCC ID: 2BVRK-WS04 Dear Sir/Madam, Added models WS04-01, WS04-02, WS04-04, WS04-03 asis of the original product WS04 The color of appearance and model name of series models listed are different from the main model, but the circuit and the electronic construction are the same, declared by the manufacturer. Sincerely, Name: Winnie Yu Title: Manager Company name: Shenzhen Yichen E-commerce Co.,Ltd Address: Building 2901-08, Xinghe WORLD-F, No.1 Yabao Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen, Guangdong, China

Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report Annex A. EUT External Photos EUT View 1 Model: WS04 EUT View 2 Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report EUT View 3 EUT View 4 Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report EUT View 5 EUT View 6 Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report EUT View 7

Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report Annex D. Label and Information FCC Label Sample Label Size:0.7cm*0.3cm FCC Label Specifications Text is Black in color and is justified. Labels are printed in indelible ink on permanent adhesive backing or silk-screened onto the EUT or shall be affixed at a conspicuous location on the EUT. Where the EUT is constructed in two or more sections connected by wires and marketed together, the above statement is required to be affixed only to the main control unit. When the EUT is so small or for such use that it is not practicable to place the statement on it, the above information shall be placed in a prominent location in the instruction manual or pamphlet supplied to the user or, alternatively, shall be placed on the container in which the device is marketed. FCC Label Location

Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report Annex B. EUT Internal Photos Model: WS04 EUT Internal View 1 EUT Internal View 2 SMD Antenna SMD Antenna Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report EUT Internal View 3 EUT Internal View 4

FCC ID: 2BVRK-WS04 RF Exposure Evaluation According to KDB 447498 D01 General RF Exposure Guidance v06 and part 2.1093，Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR, where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison Here, The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. For BR+EDR Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 0.47 0(±1) 1 1.259 2402 5 0.3902 3.0 So a SAR test is not required

Report No: DSP26040611-1E FCC Test Report Page 1 of 51 FCC TEST REPORT FCC ID: 2BVRK-WS04 Report No. : DSP26040611-1E Applicant : Shenzhen Yichen E-commerce Co.,Ltd Product Name : Wireless Earphones Model Name : WS04 Test Standard : FCC Part 15.247 Date of Issue : 2026-04-21 Shenzhen CCUT Quality Technology Co., Ltd. 1F, Building 35, Changxing Technology Industrial Park, Yutang Street, Guangming District, Shenzhen, Guangdong, China; (Tel.:+86-755-23406590 website: www.ccuttest.com) This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd. Report No: DSP26040611-1E FCC Test Report Page 2 of 51 Test Report Basic Information Applicant..................................: Shenzhen Yichen E-commerce Co.,Ltd Address of Applicant...............: Building 2901-08, Xinghe WORLD-F, No.1 Yabao Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen, Guangdong, China Manufacturer..........................: Shenzhen Yichen E-commerce Co.,Ltd Address of Manufacturer........: Building 2901-08, Xinghe WORLD-F, No.1 Yabao Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen, Guangdong, China Product Name.........................: Wireless Earphones Brand Name.............................: Main Model..............................: WS04 Series Models..........................: See section 1.1 (Page 5) Test Standard..........................: FCC Part 15 Subpart C ANSI C63.4-2014 ANSI C63.10-2020 Date of Test .............................: 2026-04-13 to 2026-04-21 Test Result...............................: PASS Tested By ................................: (Coke Huang) Reviewed By............................: (Lorzix Luo) Authorized Signatory............: (Lahm Peng) Note : This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd.. All test data presented in this test report is only applicable to presented test sample. Report No: DSP26040611-1E FCC Test Report Page 3 of 51 CONTENTS 1. General Information ....................................................................................................................................................5 1.1 Product Information .............................................................................................................................................5 1.2 Test Setup Information..........................................................................................................................................6 1.3 Compliance Standards ...........................................................................................................................................7 1.4 Test Facilities ........................................................................................................................................................7 1.5 List of Measurement Instruments ..........................................................................................................................8 1.6 Measurement Uncertainty .....................................................................................................................................9 2. Summary of Test Results ........................................................................................................................................... 10 3. Antenna Requirement ............................................................................................................................................... 11 3.1 Standard and Limit.............................................................................................................................................. 11 3.2 Test Result .......................................................................................................................................................... 11 4. Conducted Emissions ................................................................................................................................................ 12 4.1 Standard and Limit.............................................................................................................................................. 12 4.2 Test Procedure.................................................................................................................................................... 12 4.3 Test Data and Results .......................................................................................................................................... 13 5. Radiated Emissions ................................................................................................................................................... 16 5.1 Standard and Limit.............................................................................................................................................. 16 5.2 Test Procedure.................................................................................................................................................... 16 5.3 Test Data and Results .......................................................................................................................................... 18 6. Band-edge Emissions(Radiated) ............................................................................................................................... 22 6.1 Standard and Limit.............................................................................................................................................. 22 6.2 Test Procedure.................................................................................................................................................... 22 6.3 Test Data and Results ......................................................................................................…

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2.4GHz 3216 SMD Antenna: RANT3216F245X02 _ Application: WLAN,802.11b/g,Bluetooth,WLAN, etc ... Features SMD,high reliability,ultra Impact,Omni-directional... Part numberInformation RANT3216F245X02 (A)(B)(C)(D)(E)(F) ElectricalSpecification The specificationis definedon EVB. Dimensionand TerminalConfiguration No.TerminalName 1Feeding/GNG 2GND/Feeding (A)ProductTypeSMD Antenna (B) Size Code 3.2x1.6mm( ± 0.2mm) (C) MaterialHigh K material (D) Frequency2.4 ~ 2.5GHz (E) FeedingmodePIFA& SingleFeeding (F) AntennatypeType=0X WorkingFrequencyRange2400~2500MHz Bandwidth120 MHz(Min.) PeakGain2.7 dBi (Typ.) Impedance50 Ohm Returnloss10 dB ( Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature( °C )-40 ~85 °C Resistanceto SolderingHeats 10sec.( @ 280 °C ) TerminationNi / Au (Leadless) Dimension(mm) L 3.20±0.20 W 1.60±0.20 T 0.45±0.20 咏成國際科技有限公司電話:13530576606 RAIN InternationalTechnologyCo., Ltd. 7 / F, BuildingF, ZhichuangPark, Tong 'an, Gushu,Shenzhen  2.4GHz 3216 SMD Antenna: RANT3216F245X02 _ 1 EvaluationBoardReference PCB DimensionAntennaLayoutReference Unit :mm ElectricalCharacteristics ReturnLoss & Radiation ReturnLoss Frequency(MHz) S11 (dB) 2400-10.50 2450-30.62 2500-11.47 Radiation X Y Z 2.4GHz 3216 SMD Antenna: RANT3216F245X02 _ TapingSpecifications Reel and TapingSpecification Reel Specification TYPESIZEABCD 32167”5K/Reel 9.0 ±0.5 60 ±213.5 ±0.5178 ±2 TappingSpecification PackagingTypeABWEFGHTψDP PaperType3216 1.90±0.203.50±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.10 1.50±0.10 4.0±0.1 2.4GHz 3216 SMD Antenna: RANT3216F245X02 _ ReliabilityTable Test ItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfillthe electrical specification UserSpec. Thermal Shock 1. Preconditioning: 50 ± 10°C/ 1 hr , then keepfor 24 ± 1 hrs at roomtemp. 2. Initialmeasure:Spec:refer Initialspec. 3. Rapidchangeof temperaturetest: -30°Cto +85°C; 100 cycles; 15 minutesat Lowercategorytemperature; 15 minutesat Uppercategorytemperature. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 107 Temperature Cycling 1. Initialmeasure:Spec:refer Initialspec. 2. 100 Cycles(-30°Cto +85°C), SoakMode=1(2 Cycle/hours). 3. Measurementat 24 ± 2Hoursafter test condition. No VisibleDamage. Fulfillthe electrical specification. JESD22 JA104 High Temperature Exposure 1. Initialmeasure:Spec:refer Initialspec. 2. Unpowered;500hours@ T=+85°C. 3. Measurementat 24 ± 2 hoursafter test. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 108 Low Temperature Storage 1. Initialmeasure:Spec:refer Initialspec. 2. Unpowered:500hours@ T= -30°C. 3. Measurementat 24 ± 2 hoursafter test. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 108 Solderability (SMD BottomSide) Dippingmethod: a. Temperature:235 ±5°C b. Dippingtime:3 ±0.5s The soldershouldcover over 95% of the critical area of bottomside. IEC 60384-21/22 4.10 SolderingHeat Resistance (RSH) Preheatingtemperature:150 ± 10 °C. Preheatingtime:1~2 min. Soldertemperature:260 ± 5°C. Dippingtime:5 ± 0.5s No VisibleDamage.IEC 60384-21/22 4.10 Vibration5g's for 20 min.,12 cycleseachof 3 orientations Note:Use 8"X5"PCB .031"thick 7 securepointson, one long side and 2 securepointsat cornersof oppositesides.Parts mountedwithin2" from any securepoint.Test from 10-2000 Hz. No VisibleDamage.MIL-STD-202 Method204 Mechanical Shock Threeshocksin eachdirectionshall be appliedalongthe three mutuallyperpendicularaxesof the test specimen(18 shocks) Peakvalue:1,500g’s Duration:0.5ms Velocitychange:15.4 ft/s Waveform:Half-sine No VisibleDamage.MIL-STD-202 Method213 Humidity Bias 1. Humidity:85% R.H.,Temperature:85 ± 2 °C. 2. Time:500 ± 24 hours. 3. Measurementat 24 ± 2hrs after test condition. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 Method106 2.4GHz 3216 SMD Antenna: RANT3216F245X02 _ Board Flex (SMD) 1. Mountingmethod: IR-Reflow.PCB Size (L:100× W:40× T:1.6mm) 2. Applythe load in directionof the arrowuntil bendingreaches 2 mm. No VisibleDamage.AEC-Q200 005 AdhesionForceof 1.8Kgfor 60 seconds.No VisibleDamage Magnificationof 20X or greatermay be employed for inspectionof the mechanicalintegrityof the devicebodyterminalsand body/terminaljunction. AEC-Q200 006 Physical Dimension Any applicablemethodusingx10 magnification,micrometers, calipers,gauges,contourprojectors,or othermeasuring equipment,capableof determiningthe actualspecimen dimensions. In accordancewith specification. JESD22 JB100 RevisionHistory RevisionDateContent 12019/03/01New Datasheet 22020/02/22Add 2D radiationcharacteristic

Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report Annex C. Test Photos Conducted Emission Test View 1 Radiated Emission Test View Below 1GHz Report No: DSP26040611-1E FCC ID: 2BVRK-WS04 Annex of Test Report Radiated Emission Test View Above 1GHz