2A3ULHDR275RS 275 TV Headphones/ RS 255 TV Headphones

Date: 19 th Nov 2025 Sonova Consumer Hearing GmbH Am Labor 1, 30900 Wedemark, Germany Federal Communication Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Attestation Statement according to 2.911(d)(5)(i) and 2.911(d)(5)(ii) FCC ID: 2A3ULHDR275 TO WHOM IT MAY CONCERN: Hereby we confirm that the equipment for which authorization is sought, does not fall under “Prohibition on authorization of equipment on the Covered List”, pursuant to section 2.903 of the FCC rules. Further we clarify that, as of the date of the filing of the application, Sonova Consumer Hearing GmbH is not identified in the Covered List as an entity producing covered communications equipment. For and on behalf of Sonova Consumer Hearing GmbH. Sincerely, Anitha Shankari N.S Director, Regulatory Compliance Tel: +65-69797404 [email protected] Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 SENNHEISER is a brand licensed by Sonova

Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 SENNHEISER is a brand licensed by Sonova Confidentiality Request Date: 19 th Nov 2025 Model No.: HDR 275 FCC ID: 2A3ULHDR275 Attention To: Federal Communications Commission Authorization and Evaluation Division Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, the Applicant hereby requests confidential treatment of information accompanying this Application as outlined below: • Schematics • Block Diagram • Operation Description The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the Applicant and provide unjustified benefits to its competitors. The Applicant understands that pursuant to Rule 0.457, disclosure of this Application and all accompanying documentation will not be made before the date of the Grant for this application. For and on behalf of Sonova Consumer Hearing GmbH. Sincerely, ________________________ Anitha Shankari N.S Director, Regulatory Compliance Tel: +65-69797404 [email protected]

Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 SENNHEISER is a brand licensed by Sonova SHORT-TERM CONFIDENTIALITY REQUEST Date: 19 th Nov 20 25 Model No.: HDR 275 FCC ID: 2A3ULHDR275 Attention To: Federal Communications Commission Authorization and Evaluation Division Pursuant to Paragraphs §0.457 and 0.459 of the Commission's Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we request short term confidentiality for the following documents: 1. External and Internal Photographs 2. Test Setup Photos 3. User Manual We request this confidentiality on the basis of ensuring that business sensitive information remains confidential until the actual marketing of our new device, which is planned for 17 th Feb 2026. If you have any questions, please feel free to contact the undersigned. For and on behalf of Sonova Consumer Hearing GmbH. Sincerely, ________________________ Anitha Shankari N.S Director, Regulatory Compliance Tel: +65-69797404 [email protected]

Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 SENNHEISER is a brand licensed by Sonova Agency Authorization Letter Date: 19 th Nov 2025 FCC ID: 2A3ULHDR275 To whom it may concern: We, the undersigned, hereby authorize Bureau Veritas Consumer Product Services (H.K.) Ltd., Taoyuan Branch of Taiwan to act on our behalf as our agent, related to the FCC approval of our product with the following model number. Model No.: HDR 275 in the following matter: report submittal, related correspondence, the signing of all documents relating to these matters, and any other lawful activity necessary to obtain such certification. Any act carried out by BV Bureau Veritas Consumer Product Services (H.K.) Ltd., Taoyuan Branch of Taiwan within the scope of this authorization shall have the same effects as our own. This authorization is valid for six months from the original date. If you have any questions regarding the authorization, please don’t hesitate to contact us. For and on behalf of Sonova Consumer Hearing GmbH. Sincerely, ________________________ Anitha Shankari N.S Director, Regulatory Compliance Tel: +65-69797404 [email protected]

Label location Brand: SENNHEISER Model name: HDR275 FCC ID: 2A3ULHDR275 IC:28115-HDR275

SAR Exclusion Report Report Format Version 6.0.0 Page No. : 1 of 9 Report No. : SFCFQC-WTW-P25080003 Issued Date : 2025/11/6 SAR Exclusion Report FCC Rule Part : CFR §2.1093 Standards : IEEE Std 1528:2013 KDB 865664 D01 v01r04, KDB 865664 D02 v01r02, FCC-19-126, KDB 447498 D04 Interim General RF Exposure Guidance v01 Report No. : SFCFQC-WTW-P25080003 Applicant : Sonova Consumer Hearing GmbH Address : Am Labor 1, 30900 Wedemark, Germany Product Name : RS 275 TV Headphones / RS 255 TV Headphones FCC ID : 2A3ULHDR275 Brand Name : SENNHEISER Model No. : HDR 275 Sample Received Date : 2025/7/31 Date of Evaluation : 2025/8/28 Lab Address : No. 47-2, 14th Ling, Chia Pau Vil., Lin Kou Dist., New Taipei City, Taiwan Test Location : No. 19, Hwa Ya 2nd Rd., Wen Hwa Vil., Kwei Shan Dist., Taoyuan City, Taiwan FCC Accredited No. : TW0003 CERTIFICATION: The above equipment have been tested by Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch – Lin Kou Laboratories, and found compliance with the requirement of the above standards. The test record, data evaluation & Equipment Under Test (EUT) configurations represented herein are true and accurate accounts of the measurements of the sample’s SAR characteristics under the conditions specified in this report. It should not be reproduced except in full, without the written approval of our laboratory. The client should not use it to claim product certification, approval, or endorsement by TAF or any government agencies. Prepared By : Vera Huang / Specialist Approved By : Gordon Lin / Manager This report is governed by, and incorporates by reference, the Conditions of Testing as posted at the date of issuance of this report at http://www.bureauveritas.com/home/about-us/our-business/cps/about-us/terms-conditions/ and is intended for your exclusive use. Any copying or replication of this report to or for any other person or entity, or use of our name or trademark, is permitted only with our prior written permission. This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or representative of the quality or characteristics of the lot from which a test sample was taken or any similar or identical product unless specifically and expressly noted. Our report includes all of the tests requested by you and the results thereof based upon the information that you provided to us. Measurement uncertainty is only provided upon request for accredited tests. Statements of conformity are based on simple acceptance criteria without taking measurement uncertainty into account, unless otherwise requested in writing. You have 60 days from date of issuance of this report to notify us of any material error or omission caused by our negligence or if you require measurement uncertainty; provided, however, that such notice shall be in writing and shall specifically address the issue you wish to raise. A failure to raise such issue within the prescribed time shall constitute your unqualified acceptance of the completeness of this report, the tests conducted and the correctness of the report contents. SAR Exclusion Report Report Format Version 6.0.0 Page No. : 2 of 9 Report No. : SFCFQC-WTW-P25080003 Issued Date : 2025/11/6 Table of Contents Release Control Record ............................................................................................................................................................... 3 1. Test Reference Guidance ...................................................................................................................................................... 4 2. Summary of Maximum SAR Value ....................................................................................................................................... 4 3. Description of Equipment Under Test ................................................................................................................................. 5 4. SAR Measurement Evaluation .............................................................................................................................................. 6 4.1 Maximum Output Power ............................................................................................................................................... 6 4.1.1 Maximum Target Conducted Power ................................................................................................................... 6 4.2 SAR Testing Exclusions ............................................................................................................................................... 7 5. Construction Photos of EUT ................................................................................................................................................. 8 6. Information on the Testing Laboratories ............................................................................................................................. 9 SAR Exclusion Report Report Format Version 6.0.0 Page No. : 3 of 9 Report No. : SFCFQC-WTW-P25080003 Issued Date : 2025/11/6 Release Control Record Issue No. Reason for Change Date Issued SFCFQC-WTW-P25080003 Initial release 2025/11/6 SAR Exclusion Report Report Format Version 6.0.0 Page No. : 4 of 9 Report No. : SFCFQC-WTW-P25080003 Issued Date : 2025/11/6 1. Test Reference Guidance FCC Rule Part : CFR §2.1093 Measurement procedure : IEEE Std 1528:2013 KDB 865664 D01 v01r04, KDB 865664 D02 v01r02, FCC-19-126, KDB 447498 D04 Interim General RF Exposure Guidance v01 2. Summary of Maximum SAR Value Equipment Class Mode Highest Reported SAR 1g (W/kg) DSS & DTS Bluetooth Not Required Note: 1. The SAR limit (Head & Body: SAR1g 1.6 W/kg) for general population / uncontrolled exposure is specified in FCC 47 CFR part 2 (2.1093) and ANSI/IEEE C95.1-1992. Test Reference Guidance: FCC-19-126 SAR Exclusion Report Report Format Version 6.0.0 Page No. : …

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Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 1 / 15 HDR 275 Antenna Datasheet Customer Name: Sonova Consumer Hearing GmbH Product Model No: HDR 275 Antenna Model No: HDT547-R-MAIN-R2 Antenna Type: PIFA Document Date: 16/06/2025 Document Revision: 2.1 Document Template Revision: 2.1 Test Date: 13/06/2025 Antenna engineer: George Tang Brand: SENNHEISER Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 2 / 15 Contents Index 1. Antenna Specification ............................................................................................................................................ 3 2. Test Setup ............................................................................................................................................................... 7 2.1 Test equipment ................................................................................................................................................. 7 2.2 Antenna Efficiency Measurement Setup ...................................................................................................... 7 2.2.1 Test Description ......................................................................................................................................... 7 2.3 Antenna Radiation Pattern Test Setup .......................................................................................................... 9 2.3.1 Test Description ......................................................................................................................................... 9 2.4 Antenna Gain Test Setup ................................................................................................................................ 9 2.4.1 Test Description ......................................................................................................................................... 9 3. Antenna Performance .......................................................................................................................................... 10 3.1 VSWR, Return Loss, Smith Chart ............................................................................................................... 10 3.2 Antenna Efficiency Results ........................................................................................................................... 12 3.3 Radiation Pattern Results ............................................................................................................................. 13 3.4 Antenna Gain Results ................................................................................................................................... 14 Revision History: Revision No. Release Date Change Description Prepared By 1.1 13/03/2025 Change Matching George Tang 2.1 13/06/2025 Change Matching George Tang Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 3 / 15 1. Antenna Specification Antenna Type: PIFA Antenna Model No.: HDT547-R-MAIN-R2 Max. Antenna Gain: 3.01dBi Antenna position in text: Antenna on PCBA top side RF connector used? ☒ No ☐ Yes (Mfr. Nr.): Antenna position: SoC location: SoC Mfr. Nr.: Qualcomm QCC-3095-0-CSP134ATR-06-0 Matching circuit used: ☒ Yes ☐ No Designator MFR MFR. Nr: Description: C22 N/A L3 MuRata GJM1555C1HR50BB01 0.5p C21 MuRata LQG15HS6N2B02 6.2nH Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 4 / 15 Distance to human ear Min. antenna distance: 11.38mm Min. SoC distance: 10.38mm Matching circuit position: Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 5 / 15 Min. matching circuit distance: 10.83mm Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 6 / 15 Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 7 / 15 2. Test Setup 2.1 Test equipment Tested P/N: ETS-lindgren_AMS-8500 Antenna Measurement System Tested Antenna Model: Horn Antennas Test Equipment (w/ calibration date): E5071C ENA Vector Network Analyzer – Keysight Calibration Date: 2024/09/01 Test Chamber (w/ calibration date): ETS-lindgren_AMS-8500 Antenna Measurement System Calibration Date: 2025/04/16 Testers: Leo Chen 陳偉信 Test Software: ETS-Lindgren EMQuest 2.2 Antenna Efficiency Measurement Setup 2.2.1 Test Description The Antenna Anechoic Chamber Measurement Equipment: Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 8 / 15 Free space: BHR: Antenna Datasheet Sonova Consumer Hearing GmbH Am Labor 1 30900 Wedemark, Germany T +49 5130 9490 0 Sitz 30900 Wedemark, Amtsgericht Hannover HRB 221905 9 / 15 2.3 Antenna Radiation Pattern Test Setup 2.3.1 Test Description The antenna radiation pattern test is performed to characterize the directional distribution of radiated power from the antenna under test (DUT). This test determines how the antenna radiates energy in space, typically measured in an anechoic chamber to minimize reflections and external interference. The DUT is mounted on a positioner that allows for rotation in azimuth and/or elevation. A signal generator feeds the antenna, while a receiving antenna—connected to a spectrum analyzer or receiver— captures the radiated signal strength at different angles. Measurements are taken over a full 360-degree sweep (or as required) to generate a complete 2…

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Report No.: RFCFQC-WTW-P25080003 Page No. 1 / 48 Report Format Version: 7.2.0 TEST REPORT CERTIFICATE OF CONFORMITY Standard: 47 CFR FCC Part 15, Subpart C (Section 15.247) Report No.: RFCFQC-WTW-P25080003 FCC ID: 2A3ULHDR275 Product Name: RS 275 TV Headphones / RS 255 TV Headphones Brand Name: SENNHEISER Model No.: HDR 275 Received Date: 2025/7/31 Test Date: 2025/8/22 ~ 2025/8/27 Issued Date: 2025/11/6 Applicant: Sonova Consumer Hearing GmbH Address: Am Labor 1, 30900 Wedemark, Germany Issued By: Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch Lin Kou Laboratories Lab Address: No. 47-2, 14th Ling, Chia Pau Vil., Lin Kou Dist., New Taipei City, Taiwan Test Location(1): No. 70, Wenming Rd., Guishan Dist., Taoyuan City 333, Taiwan (R.O.C.) Test Location(2): No. 19, Hwa Ya 2nd Rd., Wen Hwa Vil., Kwei Shan Dist., Taoyuan City 33383, Taiwan FCC Registration / Designation Number: Test Location:281270 / TW0032 for Test Location(1) 788550 / TW0003 for Test Location(2) Approved by: , Date: 2025/11/6 Jeremy Lin / Project Engineer This test report consists of 48 pages in total. It may be duplicated completely for legal use with the approval of the applicant. It should not be reproduced except in full, without the written approval of our laboratory. The test results in the report only apply to the tested sample. The test results in this report are traceable to the national or international standards. Prepared by : Gina Liu / Specialist This report is governed by, and incorporates by reference, the Conditions of Testing as posted at the date of issuance of this report at http://www.bureauveritas.com/home/about-us/our- business/cps/about-us/terms-conditions/ and is intended for your exclusive use. Any copying or replication of this report to or for any other person or entity, or use of our name or trademark, is permitted only with our prior written permission. This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or representative of the quality or characteristics of the lot from which a test sample was taken or any similar or identical product unless specifically and expressly noted. Our report includes all of the tests requested by you and the results thereof based upon the information that you provided to us. Measurement uncertainty is only provided upon request for accredited tests. Statements of conformity are based on simple acceptance criteria without taking measurement uncertainty into account, unless otherwise requested in writing. You have 60 days from date of issuance of this report to notify us of any material error or omission caused by our negligence or if you require measurement uncertainty; provided, however, that such notice shall be in writing and shall specifically address the issue you wish to raise. A failure to raise such issue within the prescribed time shall constitute your unqualified acceptance of the completeness of this report, the tests conducted and the correctness of the report contents. Report No.: RFCFQC-WTW-P25080003 Page No. 2 / 48 Report Format Version: 7.2.0 Table of Contents Release Control Record ....................................................................................................................................................... 4 1 Certificate .................................................................................................................................................................... 5 2 Summary of Test Results .......................................................................................................................................... 6 2.1 Measurement Uncertainty ........................................................................................................................................ 6 2.2 Supplementary Information ...................................................................................................................................... 6 3 General Information ................................................................................................................................................... 7 3.1 General Description .................................................................................................................................................. 7 3.2 Antenna Description of EUT ..................................................................................................................................... 8 3.3 Channel List .............................................................................................................................................................. 8 3.4 Test Mode Applicability and Tested Channel Detail .................................................................................................. 9 3.5 Duty Cycle of Test Signal ........................................................................................................................................ 10 3.6 Test Program Used and Operation Descriptions .................................................................................................... 11 3.7 Connection Diagram of EUT and Peripheral Devices ............................................................................................ 11 3.8 Configuration of Peripheral Devices and Cable Connections ................................................................................ 11 4 Test Instruments ...................................................................................................................................................... 12 4.1 RF Output Power .................................................................................................................................................... 12 4.2 Number of Hopping Frequency Used ..................................................................................................................... 12 4.…

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