2BOBD-G912Bluetooth Headphone

shenzhenshihongyineryuekejiyouxiangongsi Covered Equipment Certification Attestation Letter 2026-09-09 Nemko North America, Inc. 303 River Road Ottawa K1V 1H2 Canada ATTN.: Reviewing Engineer FCC ID: 2BOBD-G912 shenzhenshihongyineryuekejiyouxiangongsi (“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. shenzhenshihongyineryuekejiyouxiangongsi (“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. shenzhenshihongyineryuekejiyouxiangongsi (“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: Zelin Zhang Title: CEO Company Name: shenzhenshihongyineryuekejiyouxiangongsi Address: No. 208-28, Longhua Jianshe Road, Jinglong Community, Longhua Street, Longhua District, Shenzhen N/A China 518000 Phone: 13549499969 E-Mail: [email protected] Date: 2026-09-09

shenzhenshihongyineryuekejiyouxiangongsi 2026-09-09 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: Zelin Zhang Title: CEO Company Name: shenzhenshihongyineryuekejiyouxiangongsi Address: No. 208-28, Longhua Jianshe Road, Jinglong Community, Longhua Street, Longhua District, Shenzhen N/A China 518000 Phone: 13549499969 E-Mail: [email protected] Date: 2026-09-09

shenzhenshihongyineryuekejiyouxiangongsi 2026-09-09 Nemko North America, Inc. 303 River Road Ottawa, Ontario, Canada K1V 1H2 REQUEST FOR CONFIDENTIALITY – FCC FCC ID: 2BOBD-G912 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 180 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: Zelin Zhang Title: CEO Company Name: shenzhenshihongyineryuekejiyouxiangongsi Address: No. 208-28, Longhua Jianshe Road, Jinglong Community, Longhua Street, Longhua District, Shenzhen N/A China 518000 Phone: 13549499969 E-Mail: [email protected] Date: 2026-09-09

Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E02 TRF No.: RT-4-E-006Page 1 of 6 RF EXPOSURE REPORT Applicant : shenzhenshihongyineryuekejiyouxiangongsi Address of Applicant : No. 208-28, Longhua Jianshe Road, Jinglong Community, Longhua Street, Longhua District, Shenzhen N/A China 518000 Manufacturer : Dongguan Jin wen hua digital technology Co., LTD Address of Manufacturer : NO.1 hua Da Road, Long Bei Ling Village,Tangxia Town, Dongguan City, Guangdong, china Equipment under Test : Bluetooth Headphone Model No. : G912, DB G912 FCC ID : 2BOBD-G912 Test Standard(s) : KDB447498 D01 General RF Exposure Guidance v06 Report No. : DDT-RE26082016-2E02 Issue Date : 2026/09/20 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-RE26082016-2E02 TRF No.: RT-4-E-006Page 2 of 6 Table of Contents 1.General Test Information..............................................................................................5 1.1.Description of EUT .......................................................................................................5 1.2.Accessories of EUT......................................................................................................5 1.3.Test laboratory .............................................................................................................5 2.RF Exposure evaluation for FCC .................................................................................6 2.1.Assessment procedure.................................................................................................6 2.2.Assess result ................................................................................................................6 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E02 TRF:RT-4-E-006Page 3 of 6 $!CeMetaLims!digital$ Test Report Declare Applicant : shenzhenshihongyineryuekejiyouxiangongsi Address of Applicant : No. 208-28, Longhua Jianshe Road, Jinglong Community, Longhua Street, Longhua District, Shenzhen N/A China 518000 Equipment under Test : Bluetooth Headphone Model No. : G912, DB G912 Manufacturer : Dongguan Jin wen hua digital technology Co., LTD Address of Manufacturer : NO.1 hua Da Road, Long Bei Ling Village,Tangxia Town, Dongguan City, Guangdong, china Test Standard Used: KDB447498 D01 General RF Exposure Guidance v06 We Declare: The equipment described above is tested by Guangdong Dongdian Testing Service Co., Ltd. and in the configuration tested the equipment complied with the standards specified above. The test results are contained in this test report and Guangdong Dongdian Testing Service Co., Ltd. is assumed of full responsibility for the accuracy and completeness of these tests. Report No.:DDT-RE26082016-2E02 Date of Receipt:2026/08/25Date of Test:2026/08/25~2026/09/09 Note: This report applies to above tested sample only. This report shall not be reproduced in parts without written approval of Guangdong Dongdian Testing Service Co., Ltd. Created: Zeng ZhongyaoReviewed: Zoe PengApproved: Ella Gong 2026/09/092026/09/202026/09/20 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E02 TRF:RT-4-E-006Page 4 of 6 Revision History VersionRevision ContentIssue DateApproved V0Initial issue2026/09/20Ella Gong Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E02 TRF:RT-4-E-006Page 5 of 6 1. General Test Information 1.1. Description of EUT EUT Name:Bluetooth Headphone Model Number:G912, DB G912 Difference of model number ： Only the model numbers are different. Unless specified, all the tests were conducted on model G912. EUT Function Description:Please reference user manual of this device Power Supply: Input: 5V⎓0.8A Battery: 3.7V, 8000mAh, 2.96Wh Hardware Version: V020_20260905_(AC3EA997_18DC751B） Software Version:PCB antenna Note: The above EUT information is declared by manufacturer and for more detailed features description please refer to the manufacturer's specifications or User's Manual. 1.2. Accessories of EUT AccessoriesManufacturerModel numberDescription //// 1.3. Test laboratory Guangdong Dongdian Testing Service Co., Ltd. Add.: Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808. Tel.: +86-0769-38826678, http://www.dgddt.com, Email: [email protected]. CNAS Accreditation No. L6451; A2LA Accreditation Number: 3870.01 FCC Designation Number: CN1182, Test Firm Registration Number: 540522 Innovation, Science and Economic Development Canada Site Registration Number: 10288A Conformity Assessment Body identifier: CN0048 VCCI facility registration number: C-20087, T-20088, R-20123, R-20240, G-20118 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E02 TRF:RT-4-E-006Page 6 of 6 2. RF Exposure evaluation for FCC 2.1. Assessment procedure According to 447498 D01 General RF Exposure Guidance v06 The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(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 2.2. Assess result Manufacturing Tolerance: Bluetooth: ModeAntenna Frequency [MHz] Target (dBm)Tolerance ±(dB) 2402-31 2441-31 GFSK (Peak)Ant1 2480-31 2402-31 2441-31 π/4DQPSK (Peak)Ant1 2480-31 2402-31 2441-31 8DPSK (Peak)Ant1 2480-31 Estimation Result: Worse case is as below: [2402 MHz, -3 dBm, (0.50 mW) output power] (0.50/5) ·[√2.480(GHz)] = 0.157< 3.0 for 1-g SAR Then SAR evaluation is not required. -----------------------End Report----------------------

ThistestreportbelongstoShenZhenNQInetworkcommunicationltd. andrelatedclientsto f i l e , p l e a s e k e e p i n g i t p r o p e l y , w i t h o u t o u r c o m p a n y a n d r e l a t e d c l i e n t s a l l o w e d , a n y b o d y h a s n o rightstorevalittopublic. . A n t e n n a T e s t R e p o r t F o r P r o j e c t G 9 1 2 V e r s i o n ： C u s t o m e r 金 文 华 P r o j e c t G 9 1 2 B a n d BT C o l o r I s s u e d b y W W L C h e c k e d b y C o n f i r m e d b y D a t e 2 0 2 6 . 0 9 . 1 2 Manufacturer: Dongguan Jinwenhua Digital Technology Co., Ltd. Address:No.1 Huada Road, Longbeiling Industry Zone,Tangxia Town, Dongguan City, China 523700 Jinwenhua ThistestreportbelongstoShenZhenNQInetworkcommunicationltd.andrelatedclientsto file,pleasekeepingitpropely,withoutourcompanyandrelatedclientsallowed,anybodyhasno rightstorevalittopublic. 一．TestInstrumentationanditem(测试设备及项目) 类别（Class）测试项目（Testitem）设备（Equipment） 1.Sparameter 1.回波损耗(RL) 2.驻波比（VSWR） 3.斯密斯原图（Smithchart） 网分（VNA）:AgilentE5071B R&S ZVB8 ProtekA333 2.耦合测试（ Coupling testing） 1.发射功率（MAXPower） 2.接收灵敏度（MINSens） 1.2G/3GTester：Agilent8960 2.Thecouplingbox：TESCOM TC-5060A 3.3DChamber：ETS3DChamber（5x3x3） 3.3D无源测试 （PassiveTest） 1.效率（Effeciency） 2.增益（Gain） 3.辐射方向图 （radiationpattern） 1.3DChamber：TEM243DChamber（5x5x5） ETS3DChamber（5x3x3） 2.网分（VNA）：AgilentE5071B R&SZVB8 4.3D有源测试 （ActiveTest） 1.3D功率（TRP） 2.3D灵敏度（TIS） 3.吞吐率（Throughputrate） 1.3DChamber：TEM243DChamber（5x5x5） ETS3DChamber（5x3x3） 2.2G/3GTester:Agilent8960 3.4GTester：MT8820C/CMW500 4.WIFI/BT/NB-iotTester：CMW500 5.5GTester：SP9500-CTS 6.Head：HEAD-P10（FACE-P10） ThistestreportbelongstoShenZhenNQInetworkcommunicationltd.andrelatedclientsto file,pleasekeepingitpropely,withoutourcompanyandrelatedclientsallowed,anybodyhasno rightstorevalittopublic. 二．Chambercoordinateaxis （暗室坐标） ThistestreportbelongstoShenZhenNQInetworkcommunicationltd. andrelatedclientsto f i l e , p l e a s e k e e p i n g i t p r o p e l y , w i t h o u t o u r c o m p a n y a n d r e l a t e d c l i e n t s a l l o w e d , a n y b o d y h a s n o rightstorevalittopublic. 三．Definitions（定义） VSWR：Voltage Standing Wave Rate RL：Return loss TRP：total radiated power TIS：total istropic sensitivity 四．Cell-Phone Photo and Dealing Methord（手机图片及环境处理） 五．Matching Circuit Description （匹配描述） 原版匹配 ThistestreportbelongstoShenZhenNQInetworkcommunicationltd.andrelatedclientsto file,pleasekeepingitpropely,withoutourcompanyandrelatedclientsallowed,anybodyhasno rightstorevalittopublic. 六．PassiveTest（无源测试） 6.1.RL/VSWR（回波损耗/驻波比） 6.2.增益及效率(Gainandefficiency) ThistestreportbelongstoShenZhenNQInetworkcommunicationltd.andrelatedclientsto file,pleasekeepingitpropely,withoutourcompanyandrelatedclientsallowed,anybodyhasno rightstorevalittopublic. 6.3.天线方向图（3D图） ThistestreportbelongstoShenZhenNQInetworkcommunicationltd. andrelatedclientsto f i l e , p l e a s e k e e p i n g i t p r o p e l y , w i t h o u t o u r c o m p a n y a n d r e l a t e d c l i e n t s a l l o w e d , a n y b o d y h a s n o rightstorevalittopublic. 七．TRP&TIS N Q I A N T T R P & T I S p a r a m e t e r S u m m a r y o f G 9 1 2 TestBluetoothTRP Result03978 头 模 TRP(dBm) 6.196.135.06 T I S ( d B m ) -91.08-92.02-90.94 T e s t B l u e t o o t h T R P R e s u l t 03 9 7 8 自 由 T R P ( d B m ) 6 . 6 7 6 . 4 9 5 . 4 2 T I S ( d B m ) - 9 2 . 3 7 - 9 3 . 3 1 - 9 1 . 6 5 主板传导 C h a n n e l 功 率 灵 敏 度 C H 0 1 1 . 4 3 - 9 5 C H 3 9 1 1 . 2 5 - 9 6 . 9 C H 7 8 1 0 . 9 5 - 9 5 . 9 八 . 天 线 尺 寸 （ 2 D 尺 寸 ） head phantom Free space Power Sensitivity Antenna size (2D dimension)

Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E01 TRF: RT-4-E-005Page 1 of 107 RADIO TEST REPORT Applicant : shenzhenshihongyineryuekejiyouxiangongsi Address of Applicant : No. 208-28, Longhua Jianshe Road, Jinglong Community, Longhua Street, Longhua District, Shenzhen N/A China 518000 Manufacturer : Dongguan Jin wen hua digital technology Co., LTD Address of Manufacturer : NO.1 hua Da Road, Long Bei Ling Village,Tangxia Town, Dongguan City, Guangdong, china Equipment under Test : Bluetooth Headphone Model No. : G912, DB G912 FCC ID : 2BOBD-G912 Test Standard(s) : FCC Rules and Regulations Part 15 Subpart C, ANSI C63.10-2020+Cor.1-2023+C63.10a- 2024+Errata to C63.10a-2024 Report No. : DDT-RE26082016-2E01 Issue Date : 2026/09/20 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-RE26082016-2E01 TRF: RT-4-E-005Page 2 of 107 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 ..................................................................12 4.20 dB Bandwidth ........................................................................................................13 4.1.Block diagram of test setup ........................................................................................13 4.2.Limits ..........................................................................................................................13 4.3.Test procedure ...........................................................................................................13 4.4.Test result...................................................................................................................14 4.5.Test graphs ................................................................................................................15 5.99% Bandwidth ..........................................................................................................19 5.1.Block diagram of test setup ........................................................................................19 5.2.Limits ..........................................................................................................................19 5.3.Test procedure ...........................................................................................................19 5.4.Test result...................................................................................................................20 5.5.Test graphs ................................................................................................................21 6.Maximum Peak Output Power....................................................................................25 6.1.Block diagram of test setup ........................................................................................25 6.2.Limits ..........................................................................................................................25 6.3.Test procedure ...........................................................................................................25 6.4.Test result...................................................................................................................26 6.5.Test graphs ................................................................................................................27 7.Carrier Frequency Separation ....................................................................................31 7.1.Block diagram of test setup ........................................................................................31 7.2.Limits ..........................................................................................................................31 7.3.Test procedure ...........................................................................................................31 7.4.Test result...................................................................................................................32 7.5.Test graphs ................................................................................................................33 8.Dwell Time..................................................................................................................35 Guangdong Dongdian Testing Service Co., Ltd. Report No.:DDT-RE26082016-2E01 TRF: RT-4-E-005Page 3 of 107 8.1.Block diagram of test setup ........................................................................................35 8.2.Limits ..........................................................................................................................35 8.3.Test procedure ...............…

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