2AKMBYH-L500AHEADPHONES

Kingstate Electronics(DongGuan)Co.,Ltd. Covered Equipment Certification Attestation Letter 2024-09-09 Nemko North America, Inc. 303 River Road Ottawa K1V 1H2 Canada ATTN.: Reviewing Engineer FCC ID:2AKMBYH-L500A Kingstate Electronics(DongGuan)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. Kingstate Electronics(DongGuan)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 an entity producing “covered” equipment. Signed: Printed name: Jason Guo Title: Engineer Company Name: Kingstate Electronics(DongGuan)Co.,Ltd. Address: No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Phone: 86-769-89212688 E-Mail: [email protected] Date: 2024-09-09

1/1 US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: Yamaha Corporation of America FRN: 0034098087 Contact Name: Daniel Chung Address: 6600 Orangethorpe Ave, Buena Park, CA 90620 Telephone No: (714)-522-9144 Email: [email protected] Applicant: Company name: Kingstate Electronics(DongGuan)Co.,Ltd. Product Description: HEADPHONES Grantee code: 2AKMB FCC ID: 2AKMBYH-L500A FRN：0026103820 Contact Name: Jason Guo Address: No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Telephone No: 86-769-89212688 Email: [email protected] Kingstate Electronics(DongGuan)Co.,Ltd. certifies that, as of the date of this filing of the application with the TCB, [Yamaha Corporation of America] is our designated US agent for service of process for the above referenced FCC ID. Kingstate Electronics(DongGuan)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 equipment. [Yamaha Corporation of America] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Date: 2024-09-09 Applicant’s Name: Jason Guo US Agent’s Name: Daniel Chung Title: Engineer Title: Product Compliance Manager Signature： Signature Docusign Envelope ID: 37F55432-208B-4A52-B6C0-EF1DB32AFFCD

Kingstate Electronics(DongGuan)Co.,Ltd. 2024-09-09 Nemko North America, Inc. 303 River Road Ottawa, Ontario, Canada K1V 1H2 AUTHORITY TO ACT AS AGENT - FCC On our behalf, I appoint Damon Hu, Guangdong Dongdian Testing Service Co.,Ltd.( Unit 2, Building 1, No.17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808), 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 FCC regulations will have affixed to it a label identical to that submitted for approval with this application. In signing this letter, Applicant certifies that neither the applicant nor any party to the application is not subject to a denial of Federal benefits, that include FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. § 862 because of a conviction for possession or distribution of a controlled substance. See 47 CFR 1.2002(b) for the definition of a "party" for these purposes. 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, as specified by Nemko North America Inc., still resides still resides with us. Sincerely, Printed name: Jason Guo Title: Engineer Company Name: Kingstate Electronics(DongGuan)Co.,Ltd. Address: No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Phone: 86-769-89212688 E-Mail: [email protected] Date: 2024-09-09

Kingstate Electronics(DongGuan)Co.,Ltd. 2024-09-09 Nemko North America, Inc. 303 River Road Ottawa, Ontario, Canada K1V 1H2 REQUEST FOR CONFIDENTIALITY – FCC FCC ID: 2AKMBYH-L500A Pursuant to Sections 0.457(d) and 0.459 of the Commission’s Rules and FCC Guidance document 726920, we hereby request permanent confidential treatment of exhibits identified as such in the table below and request they are permanently withheld from public review based on the documents containing trade secrets and proprietary information not customarily released to the public. The public disclosure of this information might be harmful to the applicant and provide unjustified benefits to its competitors. We also request short-term confidentiality on certain exhibits until the intended date of marketing as outlined below. We request the exhibits be withheld from public view for a period of insert number of 180 days (cannot exceed 180 days) days. We attest marketing of the product will only commence after the period of short-term confidentiality expires, or if marketing is to commence before the requested number of days listed above, the grantee will inform Nemko to release the Short-Term Confidentiality information withheld on the FCC equipment authorization website. Exhibit Type of Confidentiality Requested Block Diagrams ☒ Permanent ☐ Short Term External Photos ------------------ ☒ Short Term Internal Photos ☐ Permanent* ☒ Short Term Operation Description ☒ Permanent ☐ Short Term Parts List & Placement/BOM ☐ Permanent ☐ Short Term Tune-Up Procedure ☒ Permanent ☐ Short Term Schematic Diagrams ☒ Permanent ☐ Short Term Test Setup Photos ------------------ ☒ Short Term User’s Manual ☐ Permanent* ☒ Short Term The asterisked items (*) require further information to be provided in this justification letter before permanent confidentiality will be extended to these exhibits. Please refer to FCC KDB 726920 D01 found at: https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41731 and review section II, 3) regarding specific information that must accompany these requests. Note: any documents held under the Short-Term confidentiality will automatically become public after the requested time if an appropriate extension request has not been received. Any exhibits (i.e., schematic diagrams) that may have already been requested to have “Permanent” confidentiality as shown above need not be repeated under Short-Term confidentiality request. Sincerely, Signed: Printed name: Jason Guo Title: Engineer Company Name: Kingstate Electronics(DongGuan)Co.,Ltd. Address: No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Phone: 86-769-89212688 E-Mail: [email protected] Date: 2024-09-09

(For European Countries) Importer, Yamaha Music Europe GmbH : Siemensstrasse 22-34, 25462 Rellingen, Germany. (For United Kingdom) Importer, Yamaha Music Europe GmbH (UK): Sherbourne Drive Tilbrook, Milton Keynes, MK7 8BL, United Kingdom. Designed By Yamaha Corporation : 10-1 Nakazawa-cho, Chuo-ku, Hamamatsu, Shizuoka 430-8650, Japan MADE IN CHINA/ 2068 Headphne print data 2024.7.25 Yamaha Orui

Gereral Specifications 1. Antenna type: PCB Antenna 2. Antenna range: HS5536 PCB Antenna 3. Frequency range: 2400-2500 MHz 4. Company Name: Dongguan Jiashi communication 5. Company Address: Room 301, Building 27, Changping Jewelry Cultural Industr Center, N o. 568 Huanchang North Road, Shangkeng Village,Changping Town,D ongguan City, Guangdong Province, PRC. Antenna size 3 Antenna S parameters Item Value 2402 （ MHz ） 2441(MHz)2480(MHz) Smith(Ω) 57.8047.7239.69 Return loss(dB) -16.52-16.99 -15.71 VSWR 1.351.321.39 Antenna Passive parameter 5 Frequency (MHz) Efficiency (%)Mean gain (dBi) Peak Gain (dBi) 2400 44.98-3.472.72 2440 43.72-3.592.54 2480 45.83-3.392.34 OTA Test data—— 自由场 6 Channel03978 TRP （ dBm ） 5.475.896.53 TIS （ dBm ） -91.24-90.05-90.6 Antenna Passive parameter——头模 7 Frequency (MHz)Efficiency (%)Mean gain (dBi) Peak Gain (dBi) 2400 36.63-4.361.18 2440 36.5-4.381.29 2480 38.26-4.171.77 OTA Test data——头模 8 Channel03978 TRP （ dBm ） 4.915.516.29 TIS （ dBm ） -89.07-88.37-88.89

BOM list BOM part number 800-000645 Project:JS-HS5536 Main_V01Bdata:2024/05/29 JS Part NOSpecunit Qty Req Circuit Ref. 0010 200-011025Cap/Walsin/0402/1.5PF/+-0.25PF/50V/NPOPCS 1C11 0020 200-011005Cap/Walsin/0402/10PF/+-5%/50V/NPOPCS 1C78 0030 200-011008Cap/Walsin0402/15PF/+-5%/50V/NPOPCS 3C39,C51,C57 0040 200-011009Cap/Walsin/0402/22NF/+-10%/16V/X5RPCS 2C14,C47 0050 200-011038Cap/Walsin/0402/100NF/+-10%/16V/X7RPCS 15 C1,C12,C13,C16,C26,C27,C31,C33,C36,C38,C40,C6 4,C65,C88,C102 0060 200-011028Cap/Walsin/0402/220NF/+-10%/16V/X5RPCS 1C48 0070 200-011023Cap/Walsin/0402/470NF/+-10%/10V/X5RPCS 5C7,C8,C9,C10,C77 0080 200-011020Cap/Walsin/0402/1UF/+-10%/6.3V/X5RPCS 6C4,C15,C42,C46,C52,C58 0090 200-011040Cap/Walsin/0402/1UF/+-10%/16V/X5RPCS 2C34,C66 0100 200-011017Cap/Walsin/0402/2.2UF/+-20%/6.3V/X5RPCS 19 C5,C18,C19,C21,C22,C23,C24,C25,C28,C29,C30,C3 7,C43,C44,C45,C60,C68,C69,C70 0110 200-011049Cap/Walsin/0402/2.2UF/+-10%/10V/X5R PCS 2C2,C6 0120 200-011053Cap/Walsin/0402/4.7UF/+-20%/10V/X5R PCS 3C3,C17,C106 0130 200-011068Cap/Walsin/0402/10UF/+-20%/10V/X5RPCS 9C20,C35,C41,C53,C59,C61,C62,C63,C67 0140 201-011000Res/Walsin/0402/0R/5%PCS 14 L3,L4,L7,L8,L15,L16,L17,R11,R15,R16,R23,R47,R 63,R44 0150 201-012000Res/Walsin/0603/0R/5%PCS 4L6,L11,L12,L18 0160 201-012084Res/Walsin/0603/0.3R/1%PCS 1R50 0180 201-011026Res/Walsin/0402/22R/5%PCS 8L5,L14,R28,R33,R39,R40,R69,R72 0190 201-011002Res/Walsin/0402/100R/5%PCS 4R7,R8,R9,R10 0200 201-011142Res/Walsin/0402/470R/1%PCS 3R20,C49,C50 0210 201-011003Res/Walsin/0402/1K/5%PCS 9R2,R3,R4,R12,R19,R25,R110,R111,R43 0220 201-011020Res/Walsin/0402/4.7K/5%PCS 2R53,R60 0230 201-011093Res/Walsin/0402/5.1K/5%PCS 2R18,R22 0240 201-011014Res/Walsin/0402/10K/5%PCS 5R17,R31,R35,R37,R38 0250 201-011128Res/Walsin/0402/43K/1%PCS 1R14 0260 201-011023Res/Walsin/0402/47K/5%PCS 4R5,R13,R21,R109 0270 201-011001Res/Walsin/0402/100K/5%PCS 9R1,R26,R30,R34,R64,R65,R66,R112,R27 0280 201-011117Res/Walsin/0402/470K/1%PCS 2R41,R68 0290 208-2E0012ESD/RS/0402/RSD6325FTPCS 20 T1,T2,T3,T4,T6,T7,T8,T9,T10,T11,T13,T14,T15,T 16,T17,T21,T22,T5,T24,T25 0300 203-2O0000LRC Filter/B-TRON/0402/BTREF1005A07R601PCS 1L13 0310 206-000031LED/Yiliangsheng/0402/Red/YLS-0402RED/F-04APCS 1RED 0320 206-000032LED/Yiliangsheng/0402/Blue/YLS-0402QBC/F-04APCS 1BLUE 0330 204-070033Cry/Huiyuan/17JX32000004/3225/32M/8PF/10PPMPCS 1Y1 0340 204-070036Cry/Huiyuan/OSC3225/3225/1.8V/12MPCS 1Y2 0350 203-3G0000Filter/HEK/BPF1608R24004K02PCS 1U1 0360 202-041003Ind/Sunlord/0402/15NH/+-5%/SDCL1005C15NJTDFPCS 2L19,L20 0370 202-022004Ind/Taiyo/0603/4.7UH/+-20%/MBKK1608T4R7MPCS 2L1,L2 0380 301-000061switch/ALPS/3P/SKRTLAE010PCS 4PWR,V+,V-,SF 0390 208-500001Transistor/SOT-23/MMBT3904PCS 2Q1,Q6 0400 208-860000Transistor/CHANGJINGSOT23/CJ2301PCS 1Q7 0410 208-790002Transistor/SOT523/BAT54CT-7-FPCS 1D2 0420 208-860005Transistor/CHANGJING/SOT-89/BCX51-16PCS 1Q2 0430 205-240005IC/WILL/SOT23-5/WL2828E18-5/TR(LDO,1.8V,300mA)PCS2U3,U6 0440 205-770022IC/Qualcomm/VFBGA 134/QCC-3084-0-CSP134A/6.7*7.7*1.0 PCS 1U4 0450 205-210005IC/Macronix/SOP-8/MX25U6435FM2I-10GPCS 1U5 0460 205-5O0000IC/DSP/YAMAHA/YMU831-CZE2PCS 1U2 0470 205-3Z0001OVP/Tkplusemi/DFN-2x2-8L/SY5320-DBFRSPCS 1U8 0480 305-000261Type_C/16pin/ACF016-1E1H1A102-0HRPCS 1USB 0490 202-021047Int/Murata/0402/3.0NH/+-0.3NH/LQG15HS3N0S02DPCS 2M3,M5 0500 200-012004Cap/Walsin/0603/22UF/+-20%/6.3V/X5RPCS 1C32 0510 100-5N0030PCB/SANDEYING/JS-HS5536_V01B/4 Layer/55.12*53.37*1.0m mPCS 1 BOM List BOM part number 800-000646 Project:JS-HS5536-AUX_V01BData: 2024/04/08 JS Part NOSpecunit Qty Req Circuit Ref. 0010 200-012037Cap/Walsin/0603/10UF/+-20%/10V/X5RPCS 1C1 0020 201-011000Res/Walsin/0402/0R/5%PCS 6L1,L2,L3,L4,L5,R1 0030 201-012000Res/Walsin/0603/0R/5%PCS 1L6 0040 305-000284HAOYU/PJ-3106A 6-20NPCS 1J1 0050 208-2E0012ESD/RS/0402/RSD6325FTPCS 3T1,T2,T3 0060 100-5N0031PCB/SANDEYING/JS-HS5536-AUX_V01B/2 Layer/27*12.1*1.0mmPCS 1 BOM List BOM part nu800-000647 Project: JS-HS5536-Mic_V01Adata: 2024/04/08 页码: JS Part NO Specunit Qty ReqCircuit Ref. 0010 303-000057 MIC/瑞勤/SM2718T381QNA-01/2.75x1.85x1.1mmPCS 1MIC 0020 100-ZZ0143 PCB/SANDEYING/JS-HS5536-Mic_V01A/2 layer/8.8*3.8*1.0mmPCS 1

Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE24052920-1E07 TRF No.: RT-4-E-02-601 FCC SAR Test Report Ver.1.1 Page 1 of 27 FCC SAR TEST REPORT Applicant : Kingstate Electronics(Dongguan)Co., Ltd Address of Applicant : No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Manufacturer : Kingstate Electronics(Dongguan)Co., Ltd Address of Manufacturer : No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Equipment under Test : HEADPHONES Model No. : YH-L500A FCC ID : 2AKMBYH-L500A Test Standard(s) : Test Standard Used: IEEE Std. 1528-2013; IEC/IEEE 62209-1528:2020 FCC Rules and Regulations: 47 CFR § 2.1093 Test Procedure Used: KDB447498 D04 v01, KDB 865664 D01 v01r04, KDB 865664 D02 v01r02 Report No. : DDT-RE24052920-1E07 Issue Date : 2024/08/15 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Address of Laboratory : Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE24052920-1E07 TRF No.: RT-4-E-02-601 FCC SAR Test Report Ver.1.1 Page 2 of 27 Table of Contents 1. General test information ...................................................................................................... 6 1.1. Description of EUT .............................................................................................................. 6 1.2. Accessories of EUT ............................................................................................................. 6 1.3. Assistant equipment used for test ....................................................................................... 6 1.4. Block diagram of EUT configuration for test ....................................................................... 6 1.5. Test environment conditions ............................................................................................... 6 1.6. Test laboratory .................................................................................................................... 7 2. Summary of test results ...................................................................................................... 8 2.1. Report SAR results ............................................................................................................. 8 2.2. RF exposure limits .............................................................................................................. 8 3. SAR measurements system configuration .......................................................................... 9 3.1. The SAR measurement system .......................................................................................... 9 3.2. Isotropic E-field probe EX3DV4 ........................................................................................ 10 3.3. SAM twin phantom ............................................................................................................ 10 3.4. ELI phantom ...................................................................................................................... 11 3.5. Data acquisition electronics (DAE) ................................................................................... 11 3.6. Device holder for transmitters ........................................................................................... 12 4. Measurement procedure ................................................................................................... 13 4.1. Scanning procedure .......................................................................................................... 13 5. Description of test position ................................................................................................ 15 5.1. Body-worn accessory configurations ................................................................................ 15 5.2. Extremity exposure configurations .................................................................................... 16 6. RF exposure conditions .................................................................................................... 17 6.1. EUT Test sides .................................................................................................................. 17 6.2. Standalone SAR test exclusion considerations ................................................................ 17 7. SAR system verification procedure ................................................................................... 18 7.1. Tissue simulate liquid ........................................................................................................ 18 7.1.1. Target dielectric properties of head tissue-equivalent material ........................................ 18 7.1.2. Measurement for tissue simulate liquid ............................................................................ 18 7.2. SAR system validation ...................................................................................................... 19 7.2.1. Justification for extended SAR dipole calibrations ............................................................ 20 7.2.2. Validation test setup photograph ...................................................................................... 21 7.2.3. Summary system validation results .................................................................................. 22 7.2.4. Detailed system validation results ..................................................................................... 22 8. Equipment list .................................................................................................................... 23 9. Measurement uncertainty .................................................................................................. 24 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE24052920-1E07 TRF No.: RT-4-E-02-601 FCC SAR Test Report Ver.1.1 Page 3 of 27 10. Test re…

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Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 1 of 3 Appendix A System Validation Plots Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 2 of 3 Table of Contents 1. D2450V2-SN: 904 Validation Plot ..................................................................................... 3 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 3 of 3 1. D2450V2-SN: 904 Validation Plot

Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 1 of 3 Appendix B Highest Test Plots Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 2 of 3 Table of Contents 1. BT Head-worn 0mm SAR ....................................................................................................... 3 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 3 of 3 1. BT Head-worn 0mm SAR

Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 1 of 30 Appendix C Calibration Certification Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 2 of 30 Table of Contents 1. D2450V2-SN: 904 Calibration certification ............................................................................. 3 2. D5GHzV2-SN: 1148 Calibration certification .......................................................................... 9 3. DAE4-SN: 1366 Calibration certification............................................................................... 19 4. EX3DV4-SN: 3906 Calibration certification .......................................................................... 22 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 3 of 30 1. D2450V2-SN: 904 Calibration certification Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 4 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 5 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 6 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 7 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 8 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 9 of 30 2. D5GHzV2-SN: 1148 Calibration certification Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 10 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 11 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 12 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 13 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 14 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 15 of 30

Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 16 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 17 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 18 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 19 of 30 3. DAE4-SN: 1366 Calibration certification Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 20 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 21 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 22 of 30 4. EX3DV4-SN: 3906 Calibration certification Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 23 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 24 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 25 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 26 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 27 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 28 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 29 of 30 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 30 of 30

Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 1 of 5 Appendix D Test setup photograph Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 2 of 5 Table of Contents 1. 2.4G Tissue Head-worn Photograph ...................................................................................... 3 Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 3 of 5 1. 2.4G Tissue Head-worn Photograph Top Side-0mm Bottom Side-0mm Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 4 of 5 Left Side-0mm Right Side-0mm Guangdong Dongdian Testing ServiceCo.,Ltd. Report No.: DDT-RE24052920-1E07 Page 5 of 5 Front side-0mm Back Side-0mm

Guangdong Dongdian Testing ServiceCo.,Ltd. Page 1 of 5 Appendix E Dipole Antenna self-calibration Guangdong Dongdian Testing ServiceCo.,Ltd. Page 2 of 5 Table of Contents 1. Calibration Date ...................................................................................................................... 3 2. Calibration Items ..................................................................................................................... 3 3. Standards ................................................................................................................................ 5 4. Laboratory ............................................................................................................................... 5 5. Calibration Results .................................................................................................................. 5 Guangdong Dongdian Testing ServiceCo.,Ltd. Page 3 of 5 1. Calibration Date Calibration Date Oct.20,2023, Due to Oct.19,2024 2. Calibration Items Dipole Antenna self-calibration 1、 Calibration Method Immediate re-calibration is required for the following conditions. 1) According to KDB 865664 D01, When the most recent return-loss result, measured at least annually, deviates by more than 20% from the previous measurement (i.e. value in dB  0.2) or not meeting the required 20 dB minimum return-loss requirement. 2) When the most recent measurement of the real or imaginary parts of the impedance, measured at least annually, deviates by more than 5 Ω from the previous measurement. 3）When the measured SAR deviates from the calibrated SAR value by more than 10% due to changes in physical, mechanical, electrical or other relevant dipole conditions; i.e., the error is not introduced by incorrect measurement procedures or other issues relating to the SAR measurement system. 2、 Calibration Purpose Demonstrate that SAR target, the impedance and return loss of the dipole remain stable as required 3、 Test The Product Manufacturer Speag Name 2450MHz Dipole antenna Model number D2450V2 Environment temperature 20.8°C Look pictures As shown in figure 1 Manufacturer Speag Name 5GHz Dipole antenna Model numbe D5GHZV2 Environment temperature 20.8°C Look pictures As shown in figure 2 Guangdong Dongdian Testing ServiceCo.,Ltd. Page 4 of 5 Figure 1 Test signal source Figure 2 Test signal source Guangdong Dongdian Testing ServiceCo.,Ltd. Page 5 of 5 3. Standards This antenna calibration is conducted according to KDB 865664 D01 4. Laboratory The following personnel participated in this laboratory: Table 1： Participate in the measurement laboratory Laboratory Name Temp°C Test person Guangdong Dongdian Testing Service Co., Ltd. 20.8°C Johnson Huang 5. Calibration Results The quality control test results are shown in Table 2 and Table 3, and the detailed test data is in the attachment Table 2 Calibrated Antenna Target Return loss Test Return loss Deviation Result 2450 -28.825 -28.394 1.50% OK 5200 -24.780 -20.041 19.12% OK 5300 -24.151 -27.179 12.54% OK 5500 -23.082 -25.183 9.10% OK 5600 -22.239 -23.471 5.54% OK Table 3 Calibrated Antenna Target Impedance （Real） Target Impedance （Imaginary Test Impedance （Real） Test Impedance （Imaginary） Deviation （Real） Deviation （Imaginary） Result 2450 53.391 1.586 50.607 2.878 2.784 1.292 OK 5200 49.477 -8.009 52.310 -8.448 2.833 0.439 OK 5300 54.645 -5.723 49.946 -3.293 4.699 2.43 OK 5500 56.887 -4.538 52.061 -5.591 4.826 1.053 OK 5600 56.214 -5.378 52.520 -4.505 3.694 0.873 OK

Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE24052920-1E02 TRF No.: RT-4-E-02-001 RF test report Ver. 1.0 Page 1 of 80 FCC CERTIFICATION TEST REPORT Applicant : Kingstate Electronics(Dongguan)Co., Ltd Address of Applicant : No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Manufacturer : Kingstate Electronics(Dongguan)Co., Ltd Address of Manufacturer : No 11 Chong Tian Avenue, Shi Pai Town, Dong Guan City, Guang Dong Province, China. Equipment under Test : HEADPHONES Model No. : YH-L500A FCC ID : 2AKMBYH-L500A Test Standard(s) : FCC Rules and Regulations Part 15 Subpart C, ANSI C63.10:2013 Report No. : DDT-RE24052920-1E02 Issue Date : 2024/08/13 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE24052920-1E02 TRF No.: RT-4-E-02-001 RF test report Ver. 1.0 Page 2 of 80 Table of Contents 1. Summary of Test Results ............................................................................................. 7 2. General Test Information .............................................................................................. 8 2.1. Description of EUT ........................................................................................................ 8 2.2. Accessories of EUT ...................................................................................................... 9 2.3. Block diagram of EUT configuration for test ................................................................. 9 2.4. Decision of final test mode ........................................................................................... 9 2.5. Deviations of test standard ......................................................................................... 10 2.6. Test environment conditions ....................................................................................... 10 2.7. Test laboratory ............................................................................................................ 10 2.8. Measurement uncertainty ........................................................................................... 11 3. Equipment Used During Conductive Test .................…

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