2BSRV-Y9MUSIC PLAYER

Shenzhen Lingke Technology Co., Ltd. Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 [November 19, 2025] U.S. Agent Designation [Shenzhen Lingke Technology 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: 2BSRV-Y9 Name and company of U.S. agent: [GLOCERTS TECHNOLOGY INC] Physical U.S. address of agent: [19784 SUNKISSED RIDGE DR, RIVERSIDE, CA 92507] FRN of U.S. agent: [0036339737] Email address of U.S. agent: [[email protected]] Telephone of U.S.agent: (626) 588-8039 [GLOCERTS TECHNOLOGY INC] acknowledges their obligation to accept service of process on behalf of [Shenzhen Lingke Technology Co., Ltd.]. [Shenzhen Lingke Technology Co., Ltd.] with the FRN [0037613775] accepts its obligation to maintain an agent for service of process in the United States for no less than 1 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. Sincerely, Signature Signature [Cuimei Rao] [Huiying Fan] [General Manager] [Director] [Shenzhen Lingke Technology Co., Ltd.] [GLOCERTS TECHNOLOGY INC]

Shenzhen Lingke Technology Co., Ltd. (November 19, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: 2BSRV-Y9 [Shenzhen Lingke Technology 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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, (Applicant signature) (Applicant printed name) Cuimei Rao Shenzhen Lingke Technology Co., Ltd. (November 19, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: 2BSRV-Y9 [Shenzhen Lingke Technology 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. Sincerely, (Applicant signature) (Applicant printed name) Cuimei Rao

Shenzhen Lingke Technology Co., Ltd. Model Difference Data：November 19, 2025 Product description: MUSIC PLAYER Model name: Y9, Y3, Y5, Y6, Y7 Trade Name: HIFIFEEU FCC ID: 2BSRV-Y9 All models have the same circuit and RF module, only the model names and product memory versions are different. Regards Sincerely Client’s signature : Client’s name / title : Cuimei Rao（General Manager） Contact information / address：Suite 2001, Building 3, Tangdong Optoelectronics R & D Tower, Guxing Community, Xixiang Sub-district Bao'an District, Shenzhen Guangdong, China

Shenzhen Lingke Technology Co., Ltd. (November 19, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (MUSIC PLAYER / Y9, Y3, Y5, Y6, Y7/ FCC ID: 2BSRV-Y9) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: Cuimei Rao Title: General Manager

Shenzhen Lingke Technology Co., Ltd. (November 13, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) 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). This agreement expires one year from the current date. Sincerely, Signature: Name: Cuimei Rao Title: General Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 20 External Photos Model: Y9 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 5 of 20 Model: Y3 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 6 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 7 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 8 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 9 of 20 Model: Y5 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 10 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 11 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 12 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 13 of 20 Model: Y6 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 14 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 15 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 16 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 17 of 20 Model: Y7 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 18 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 19 of 20 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 20 of 20

Shenzhen CTB Testing Co., Ltd. FCC ID:2BSRV-Y9 Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. EDR: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -0.385 0.92 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 1.147 1.30 1±1 2.00 1.58 <5 0.49524 3.00 YES 2.480 -0.016 1.00 0±1 1.00 1.26 <5 0.39651 3.00 YES 2.402 -1.337 0.74 -1±1 0.00 1.00 <5 0.30997 3.00 YES 2.441 -0.729 0.85 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -1.118 0.77 -1±1 0.00 1.00 <5 0.31496 3.00 YES 2.402 1.083 1.28 1±1 2.00 1.58 <5 0.49127 3.00 YES 2.441 1.277 1.34 1±1 2.00 1.58 <5 0.49524 3.00 YES 2.480 -0.591 0.87 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK π /4DQPSK 8DQPSK BLE: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 1.557 1.43 1±1 2.00 1.58 <5 0.49127 3.00 YES 2.44 0.781 1.20 0±1 1.00 1.26 <5 0.39330 3.00 YES 2.480 -0.502 0.89 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK Conclusion: For the max result : 0.49524≤ FCC Limit 3.0 for 1g SAR.

Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 1 Approval Sheet 客户名称 天音 (Customer Name） 产品名称 TY245 Antenna (Specification) 客户料号 (Customer P/N) 产品料号 (O/I) 送样日期 2025-10-21 Frequency band 2.4GBT Version A RF Chenmushao Confirm Structural Engineer Yangyuzhen Customer confirmation Date Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 2 Catalogue 1. Project image 2. Test fixture 3.Matching circuit 4. S11Test electrical performance 4.1 S11Test Method Description Specification Standards 4.2 S11Parameter 4.3 S11Parameter image 5.Power and sensitivity testing 5.1 Test data 6.Structural drawings Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 3 1.Project image (for reference only) BTAntenna 2. Passive Test Purpose: To test the passive parameters of the antenna as accurately as possible. Method: This fixture uses a 50 ohm coaxial cable, with one end connected to the test point at the back end of the matching circuit (RF test hole front section) of the mobile phone motherboard, and the other end connected to the SMA connector. As shown in the following figure: Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 4 The following table shows the performance test indicators for TY245mass-produced antennas： TY245 - Antenna Frequency (MHz) VSWR Frequency (MHz) VSWR Frequency band Transmitting end Receiving end 2.4G BT 2400-2480 ≤3.0 2400-2480 ≤3.0 3.Matching circuit 4. S11Test 4.1 S11Test Method Description Specification Standards VSWR The testing devices are sequentially connected as follows： E5071BNetwork analyzer→50Ω Coaxial line→120mm Copper tube→Test fixture。 Treatment of testing fixture: Use a hard cable to lead out the SMA-J connector from the 50 ohm test point of the antenna on the mobile phone PCB, connect it to a copper pipe with a choke ring, and then connect other devices in sequence. Element Matching Value E1 E2 0 E3 Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 5 Test diagram 4.2 S11Parameter The following table shows the standing wave ratio values at the edge frequency points of the ME61 antenna operating frequency band. The waveform diagrams of Return Loss and VSWR obtained from the test are shown in the attachment. 4.3 S11 Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 6 5. Power and sensitivity testing Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 7 5.1 Antenna gain 5.2 -2D /3DPhi 2.4G-BT Freq Effi Gain (MHz) (%) (DBi) 2400 25.89 -1.05 2420 26.87 -0.76 2440 28.69 -0.45 2460 29.58 -0.35 2480 29.67 -0.2 Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Shenzhen Deshiqin Technology Co., Ltd. - Recognition Letter Dosking MicroElectronics Co.,Ltd Address: Building 2, Private Enterprise Technology Park, Xili University City, Nanshan District, Shenzhen (Hongji Building), West Block 403TEL:0755-88602767 FAX:0755-82793883 8 6.Structural drawings

Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 100 TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objec tion to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: MUSIC PLAYER FCC ID: 2BSRV-Y9 Trademark:HIFIFEEU Model Number: Y9, Y3, Y5, Y6, Y7 Prepared For: Shenzhen Lingke Technology Co., Ltd. Address: Suite 2001, Building 3, Tangdong Optoelectronics R & D Tower, Guxing Community, Xixiang Sub-district Bao'an District, Shenzhen Guangdong, China Manufacturer: Shenzhen Lingke Technology Co., Ltd. Address: Suite 2001, Building 3, Tangdong Optoelectronics R & D Tower, Guxing Community, Xixiang Sub-district Bao'an District, Shenzhen Guangdong, China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Oct. 15, 2025 Sample tested Date: Oct. 15, 2025 to Nov. 26, 2025 Issue Date: Nov. 26, 2025 Report No.: CTB25101501705RF02 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Te chnology Co., Ltd. Report No.:CTB25101501705RF02 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 100 TABLE OF CONT ENT Test Report Declaration Page 1.VERSION .......................................................................... 4 2.TEST SUMMARY ................................................................... 5 3.MEASUREMENT UNCERTAINTY ..................................................... 6 4.PRODUCT INFORMATION AND TEST SETUP .......................................... 7 4.1 Product Information ................................................................... 7 4.2 Test Setup Configuration ............................................................... 7 4.3 Support Equipment ................................................................... 7 4.4 Channel List ......................................................................... 8 4.5 Test Mode ........................................................................... 8 4.6 Test Environment ..................................................................... 8 5.TEST FACILITY AND TEST INSTRUMENT USED ....................................... 9 5.1 Test Facility .......................................................................... 9 5.2 Test Instrument Used .................................................................. 9 6.AC POWER LINE CONDUCTED EMISSION ............................................ 12 6.1 Block Diagram Of Test Setup .......................................................... 12 6.2 Limit ............................................................................... 12 6.3 Test procedure ...................................................................... 12 6.4 Test Result ......................................................................... 14 7.RADIATED SPURIOUS EMISSION ................................................... 24 7.1 Block Di agram Of Test Setup .......................................................... 24 7.2 Limit ............................................................................... 24 7.3 Test procedure ...................................................................... 25 7.4 Test Result ......................................................................... 26 8.BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 71 8.1 Block Diagram Of Test Setup .......................................................... 71 8.2 Limit ............................................................................... 71 8.3 Test procedure ...................................................................... 71 8.4 Test Result ......................................................................... 72 9.COUDUCTED PEAK OUTPUT POWER ............................................... 79 9.1 Block Diagram Of Test Setup .......................................................... 79 9.2 Limit ............................................................................... 79 9.3 Test procedure ...................................................................... 79 9.4 Test Result ......................................................................... 79 10.20DB OCCUPIED BANDWIDTH ..................................................... 83 10.1 Block Diagram Of Test Setup ......................................................... 83 10.2 Limit .............................................................................. 83 10.3 Test procedure ..................................................................... 83 10.4 Test Result ........................................................................ 83 11.CARRIER FREQUENCIES SEPARATION ............................................. 87 11.1 Block Diagram Of Test Setup ......................................................... 87 11.2 Limit .............................................................................. 87 11.3 Test procedure ..................................................................... 87 11.4 Test Result ........................................................................ 87 12.HOPPING CHANNEL NUMBER ...................................................... 91 12.1 Block Diagram Of Test Setup ...........................…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: Y9 Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions