2AONT-BN903AWIRELESS ANC HEADPHONES

BN903A BN903A BN903A Our product is covered by a 3-year limited warranty. [email protected]

Huizhou Kelin Acoustic co.,Ltd No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 2025/12/02 U.S. Agent Designation Huizhou Kelin Acoustic co.,Ltd acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought (FCC ID: 2AONT-BN903A): Name and company of U.S. agent: GLOCERTS TECHNOLOGY INC Physical U.S. address of agent: 19784 SUNKISSED RIDGE DR RIVERSIDE, CA 92507 United States FRN of U.S. agent: 0036339737 Email address of U.S. agent: [email protected] GLOCERTS TECHNOLOGY INC acknowledges their obligation to accept service of process on behalf of Huizhou Kelin Acoustic co.,Ltd Huizhou Kelin Acoustic co.,Ltd with the FRN [0027102292] accepts its obligation 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. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. Sincerely, Signature Zhang Hua Manager Huizhou Kelin Acoustic co.,Ltd Signature Huiying Fan Director GLOCERTS TECHNOLOGY INC 48_[mo del] US_Agent_2.911(d)(7) - U, V0 5

FCC ID: 2AONT-BN903A External Photos of the EUT FCC ID: 2AONT-BN903A FCC ID: 2AONT-BN903A

Label and Location Size: L: 2.0cm*W: 1.0cm Label and Location FCC ID : 2AONT-BN903A

FCC ID: 2AONT-BN903A Internal Photos of the EUT FCC ID: 2AONT-BN903A FCC ID: 2AONT-BN903A ANT FCC ID: 2AONT-BN903A FCC ID: 2AONT-BN903A

Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn RF Exposure evaluation Report Reference No. .................... : FCC ID. ........................................... : CTA25092801102 2AONT-BN903A Compiled by ( position+printed name+signature) . : File administrators Zoey Cao Supervised by ( position+printed name+signature) . : Project Engineer Ace Chai Approved by ( position+printed name+signature) . : RF Manager Eric Wang Date of issue .................................... : Oct. 13, 2025 Testing Laboratory Name ............. : Shenzhen CTA Testing Technology Co., Ltd. Address ........................................... : Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao‘an District, Shenzhen, China Applicant’s name ........................... : Huizhou Kelin Acoustic co.,Ltd Address ........................................... : No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Standard .......................................... : 47CFR §1.1310 47CFR §2.1093 KDB447498 D01 General RF Exposure Guidance v06 Shenzhen CTA Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purpses as long as the Shenzhen CTA Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTA Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : WIRELESS ANC HEADPHONES Trade Mark ........................................ N/A Manufacturer .................................... : Huizhou Kelin Acoustic co.,Ltd Model/Type reference ...................... : BN903A Listed Models ................................... : BN902A, BN901A Rating ............................................... : DC 3.7V From battery and DC 5.0V From external circuit Result ............................................... : PASS Report No.: CTA25092801102 Page 2 of 8 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn T E S T R E P O R T Equipment under Test : WIRELESS ANC HEADPHONES Model /Type : BN903A Listed Models : BN902A, BN901A Model difference : The PCB board, circuit, structure and internal of these models are the same, Only model number and colour is different for these model. Applicant : Huizhou Kelin Acoustic co.,Ltd Address : No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Manufacturer : Huizhou Kelin Acoustic co.,Ltd Address : No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: CTA25092801102 Page 3 of 8 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Contents 1 TEST STANDARDS ............................................................................................................ 4 2 SUMMARY .......................................................................................................................... 5 2.1 General Remarks ..................................................................................................... 5 2.2 Product Description ................................................................................................. 5 2.3 Special Accessories ................................................................................................. 5 2.4 Modifications ............................................................................................................ 5 3 TEST ENVIRONMENT ....................................................................................................... 6 3.1 Address of the test laboratory .................................................................................. 6 3.2 Test Facility .............................................................................................................. 6 3.3 Statement of the measurement uncertainty ............................................................. 6 4 Test limit .............................................................................................................................. 7 4.1 Requirement ............................................................................................................ 7 4.2 Conducted Power Results ....................................................................................... 7 4.3 Manufacturing tolerance .......................................................................................... 7 4.4 Evaluation Result ..................................................................................................... 8 4.5 Simultaneous Transmission for SAR Exclusion ...................................................... 8 5 Conclusion ........................................................................................................................... 8 Report No.: CTA25092801102 Page 4 of 8 Shenzhen CTA Testing Technology Co., Ltd. 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1 FCC Appendix RF Test Data for BT FCC ID : 2AONT-BN903A Company : Huizhou Kelin Acoustic co.,Ltd EUT : WIRELESS ANC HEADPHONES Model Number : BN903A Report No. : CTA25092801101 Reviewed By : Eric Wang 2 Appendix A: 20dB Emission Bandwidth Test Result TestMode Antenna Freq(MHz) 20dB EBW[MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.945 2401.553 2402.498 --- --- 2441 0.957 2440.547 2441.504 --- --- 2480 0.951 2479.547 2480.498 --- --- 2DH5 Ant1 2402 1.317 2401.349 2402.666 --- --- 2441 1.278 2440.382 2441.660 --- --- 2480 1.326 2479.349 2480.675 --- --- 3 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 4 2DH5_Ant1_2402 2DH5_Ant1_2441 5 2DH5_Ant1_2480 6 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Freq(MHz) OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.87184 2401.5740 2402.4458 --- --- 2441 0.87164 2440.5727 2441.4444 --- --- 2480 0.86532 2479.5761 2480.4415 --- --- 2DH5 Ant1 2402 1.1885 2401.4167 2402.6052 --- --- 2441 1.1888 2440.4170 2441.6058 --- --- 2480 1.1889 2479.4174 2480.6063 --- --- 7 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 8 2DH5_Ant1_2402 2DH5_Ant1_2441 9 2DH5_Ant1_2480 10 Appendix C: Maximum conducted output power Test Result Peak Test Mode Antenna Freq(MHz) Conducted Peak Powert[dBm] Conducted Limit[dBm] Verdict DH5 Ant1 2402 0.06 ≤20.97 PASS 2441 -0.55 ≤20.97 PASS 2480 -0.90 ≤20.97 PASS 2DH5 Ant1 2402 -0.74 ≤20.97 PASS 2441 -1.37 ≤20.97 PASS 2480 -1.72 ≤20.97 PASS 11 Appendix D: Carrier frequency separation Test Result TestMode Antenna Freq(MHz) Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 1.012 ≥0.957 PASS 2DH5 Ant1 Hop 1.096 ≥0.884 PASS 12 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop 13 Appendix E: Time of occupancy Test Result TestMode Antenna Freq(MHz) BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH1 Ant1 Hop 0.390 319 0.124 ≤0.4 PASS DH3 Ant1 Hop 1.640 159 0.261 ≤0.4 PASS DH5 Ant1 Hop 2.890 94 0.272 ≤0.4 PASS 2DH1 Ant1 Hop 0.390 318 0.124 ≤0.4 PASS 2DH3 Ant1 Hop 1.650 155 0.256 ≤0.4 PASS 2DH5 Ant1 Hop 2.900 108 0.313 ≤0.4 PASS 14 Test Graphs DH1_Ant1_Hop DH3_Ant1_Hop 15 DH5_Ant1_Hop 16 2DH1_Ant1_Hop 2DH3_Ant1_Hop 17 2DH5_Ant1_Hop 18 19 Appendix F: Number of hopping channels Test Result TestMode Antenna Freq(MHz) Result[Num] Limit[Num] Verdict DH5 Ant1 Hop 79 ≥15 PASS 2DH5 Ant1 Hop 79 ≥15 PASS 20 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop 21 Appendix G: Band edge measurements Test Result TestMode Antenna ChName Freq(MHz) RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -0.34 -54.57 ≤-20.34 PASS High 2480 -1.36 -53.33 ≤-21.36 PASS Low Hop_2402 -3.41 -56.89 ≤-23.41 PASS High Hop_2480 -4.90 -64.21 ≤-24.9 PASS 2DH5 Ant1 Low 2402 -4.79 -57.76 ≤-24.79 PASS High 2480 -4.32 -62.44 ≤-24.32 PASS Low Hop_2402 -4.75 -61.5 ≤-24.75 PASS High Hop_2480 -4.44 -64.7 ≤-24.44 PASS 22 Test Graphs DH5_Ant1_Low_2402 DH5_Ant1_High_2480 DH5_Ant1_Low_Hop_2402 23 DH5_Ant1_High_Hop_2480 2DH5_Ant1_Low_2402 24 2DH5_Ant1_High_2480 2DH5_Ant1_Low_Hop_2402 2DH5_Ant1_High_Hop_2480 25 26 Appendix H: Conducted Spurious Emission Test Result TestMode Antenna Freq(MHz) FreqRange [MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 2402 Reference -0.89 -0.89 --- PASS 30~1000 -0.89 -68.05 ≤-20.89 PASS 1000~26500 -0.89 -41.75 ≤-20.89 PASS 2441 Reference -1.65 -1.65 --- PASS 30~1000 -1.65 -67.95 ≤-21.65 PASS 1000~26500 -1.65 -41.25 ≤-21.65 PASS 2480 Reference -1.68 -1.68 --- PASS 30~1000 -1.68 -67.99 ≤-21.68 PASS 1000~26500 -1.68 -42.88 ≤-21.68 PASS 2DH5 Ant1 2402 Reference -4.79 -4.79 --- PASS 30~1000 -4.79 -52.72 ≤-24.79 PASS 1000~26500 -4.79 -50.06 ≤-24.79 PASS 2441 Reference -4.85 -4.85 --- PASS 30~1000 -4.85 -67.45 ≤-24.85 PASS 1000~26500 -4.85 -49.73 ≤-24.85 PASS 2480 Reference -5.15 -5.15 --- PASS 30~1000 -5.15 -68.04 ≤-25.15 PASS 1000~26500 -5.15 -47.13 ≤-25.15 PASS 27 Test Graphs DH5_Ant1_2402_0~Reference DH5_Ant1_2402_30~1000 DH5_Ant1_2402_1000~26500 28 DH5_Ant1_2441_0~Reference DH5_Ant1_2441_30~1000 29 DH5_Ant1_2441_1000~26500 DH5_Ant1_2480_0~Reference DH5_Ant1_2480_30~1000 30 DH5_Ant1_2480_1000~26500 2DH5_Ant1_2402_0~Reference 31 2DH5_Ant1_2402_30~1000 2DH5_Ant1_2402_1000~26500 2DH5_Ant1_2441_0~Reference 32 2DH5_Ant1_2441_30~1000 2DH5_Ant1_2441_1000~26500 33 2DH5_Ant1_2480_0~Reference 2DH5_Ant1_2480_30~1000 2DH5_Ant1_2480_1000~26500 34 35 Appendix I: Duty Cycle Test Result TestMode Antenna Freq(MHz) ON Time [ms] Period [ms] DC [%] xFactor Limit Verdict DH5 Ant1 2402 2.92 3.75 77.87 1.09 --- --- 2441 2.91 3.75 77.60 1.10 --- --- 2480 2.92 3.75 77.87 1.09 --- --- 2DH5 Ant1 2402 2.92 3.75 77.87 1.09 --- --- 2441 2.92 3.75 77.87 1.09 --- --- 2480 2.91 3.75 77.60 1.10 --- --- 36 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 37 2DH5_Ant1_2402 2DH5_Ant1_2441 38 2DH5_Ant1_2480

Type_2 Antenna Design Layout Guidelines & Pattern 1. Antenna Mechanical Dimensions (mm): (Figure.1) Top-Layer PCB picture (Figure.2) 2. The PCB board is set as follows: This antenna type is suitable for A. PCB board thickness is _1.0 mm B. PCB sheet is _FR4 Manufacturer:Huizhou Kelin Acoustic Co., LTD Address:Part of the Second Floor of the Huili Powder Coating Company Factory Building, Dongjiang Village, Chenjiang Street, Zhongkai High Tech Zone, Huizhou City, Guangdong Province, China 3. The antenna measurement and field shape simulation results are as follows: * Return Loss / Standing Wave Ratio (VSWR) measurement: (Figure.3) *2D Radiation Patterns : (Figure.4) *3D Radiation Patterns : (Figure.5) :From the above measurement and simulation, we can know that the gain of this antenna can reach about 1.5dBi. 4.Antenna Radiation Patterns: Summary (Table.1) CenterFrequency_2400MHz DUT_ Horizontal ITEMSPEC. AntennaTypeType_2_SingleWiggleAntenna 2400MHz 2.48dBi CenterFrequency2450MHz 2.82dBi 2500MHz 3.7dBi Max.GAIN3.7dBi Mini.GAIN﹣48.85dBi AVGGAIN﹣4.62dBi DUTPolarizationHorizontal&Vertical TESTOutputPowerLevel10dBm Impedance50 Ω DUT_ Vertical CenterFrequency_2450MHz DUT_ Horizontal DUT_ Vertical CenterFrequency_2500MHz DUT_ Horizontal DUT_ Vertical

Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn FCC PART 15 SUBPART C TEST REPORT FCC PART 15.247 Report Reference No. .................... : FCC ID. ........................................... : CTA25092801101 2AONT-BN903A Compiled by ( position+printed name+signature) . : File administrators Zoey Cao Supervised by ( position+printed name+signature) . : Project Engineer Ace Chai Approved by ( position+printed name+signature) . : RF Manager Eric Wang Date of issue .................................... : Oct. 13, 2025 Testing Laboratory Name .............. : Shenzhen CTA Testing Technology Co., Ltd. Address ............................................ : Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao‘an District, Shenzhen, China Applicant’s name ........................... : Huizhou Kelin Acoustic co.,Ltd Address ............................................ : No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Test specification ........................... : Standard ........................................... : FCC Part 15.247 Shenzhen CTA Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen CTA Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTA Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : WIRELESS ANC HEADPHONES Trade Mark ....................................... : N/A Manufacturer .................................... : Huizhou Kelin Acoustic co.,Ltd Model/Type reference ...................... : BN903A Listed Models ................................... : BN902A, BN901A Modulation ....................................... : GFSK, Π/4DQPSK Frequency ......................................... From 2402MHz to 2480MHz Ratings ............................................. : DC 3.7V From battery and DC 5.0V From external circuit Result ............................................... : PASS Report No.: CTA25092801101 Page 2 of 38 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn T E S T R E P O R T Equipment under Test : WIRELESS ANC HEADPHONES Model /Type : BN903A Listed Models : BN902A, BN901A Model difference : The PCB board, circuit, structure and internal of these models are the same, Only model number and colour is different for these model. Applicant : Huizhou Kelin Acoustic co.,Ltd Address : No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Manufacturer : Huizhou Kelin Acoustic co.,Ltd Address : No.18, Gonglian Dutian Industrial Zone, Longfeng Street, Huicheng District, HuiZhou City, GuangDong Province, China Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: CTA25092801101 Page 3 of 38 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Contents 1 TEST STANDARDS ...................................................................................................................................... 4 2 SUMMARY .................................................................................................................................................... 5 2.1 General Remarks .............................................................................................................................. 5 2.2 Product Description ........................................................................................................................... 5 2.3 Equipment Under Test ....................................................................................................................... 5 2.4 Short description of the Equipment under Test (EUT) ...................................................................... 5 2.5 EUT configuration .............................................................................................................................. 5 2.6 EUT operation mode ......................................................................................................................... 6 2.7 Block Diagram of Test Setup ............................................................................................................. 6 2.8 Related Submittal(s) / Grant (s) ......................................................................................................... 6 2.9 Modifications ...................................................................................................................................... 6 3 TEST ENVIRONMENT ................................................................................................................................. 7 3.1 Address of the test laboratory ........................................................................................................... 7 3.2 Test Facility.....................................................................................................…

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FCC ID: 2AONT-BN903A Test Setup Photos of the EUT FCC ID: 2AONT-BN903A