SBVRM052Wireless Headphone

Sonos, Inc Confirmation Letter WE, The product: Wireless Headphone And model No: S52A FCC ID: SBVRM052 We declare that the software and associated drivers will not initiate any transmission on DFS frequencies without initiation by a master. This includes restrictions on transmissions for beacons and support for ad-hoc peer-to-peer modes. Best Regards Name: Hogan He Job Title: Senior Compliance Engineering Company Name: Sonos, Inc. Date: 4/27/2026

Sonos, Inc. Date: 8/3/2026 Federal Communications Commissions Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 §2.911 (d)(5) Attestation FCC ID: SBVRM052 Grantee FRN: 0011206661 1. Sonos, Inc. 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. 2. Sonos, Inc. (“the applicant”) certifies that, the device does not have cybersecurity and / or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, identified on the Covered List installed on the device, nor will it be installed by the applicant anytime after certification. 3. Sonos, Inc. (“the applicant”) certifies that the RF device is not a router “produced in a foreign country”. 4. Sonos, Inc.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 and is not an affiliate or subsidiary of an entity identified on the Covered List. Sincerely yours, Name: Hogan He Job Title: Senior Compliance Engineering Company Name:Sonos, Inc.

Sonos, Inc. Date: 4/27/2026 Federal Communications Commissions Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 §2.911 (d)(7) Agent Designation Attestation FCC ID: SBVRM052 Grantee FRN: 0011206661 To whom it may concern: Sonos, Inc. (“the applicant”) as required by section §2.911(d)(7), will also serve as the agent for service of process for the above referenced FCC ID. The applicant acknowledges that they will 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 the equipment. The applicant further acknowledges their responsibility under CFR 47 §2.929(c) to inform the FCC whenever the agent information changes. Contact Person Zibo Nelson Company Name Sonos, Inc. FCC FRN: 0011206661 Company US Address 301 Coromar Dr,Goleta, CA 93117,United States Email [email protected] Sincerely yours, Name: Hogan He Job Title: Senior Compliance Engineering Company Name:Sonos, Inc.

Sonos, Inc. Date: 4/27/2026 Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 To whom it may concern: I, the undersigned, hereby authorize UL Verification Services Inc. to act on our behalf in all manners relating to application for equipment authorization, including signing of all documents relating to these matters. Any and all acts carried out by UL Verification Services Inc. on our behalf shall have the same effect as acts of our own. I, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). In authorizing UL Verification Services Inc. as our representative, we still recognize that we are responsible to: a) comply with the relevant provisions of the certification program; b) make all necessary arrangements for the conduct of the evaluation, including provision for examining documentation and access to all areas, records (including internal audit reports) and personnel for the purposes of evaluation (e.g. testing, inspection, assessment, surveillance, reassessment) and resolution of complaints; c) make claims regarding certification only in respect of the scope for which certification has been granted; d) do not use our product certification in such a manner as to bring the Certification Division into disrepute and not make any statement regarding our product certification which the Certification Division may consider misleading or unauthorized; e) upon suspension or cancellation of certification, discontinue use of all advertising matter that contains any reference thereto and return any certification documents as required by the Certification Division; f) use certification only to indicate the products are certified as being in conformity with specified standards; g) endeavor to ensure that no certificate or report nor any part thereof is used in a misleading manner; h) ensure that any reference to our product certification in communication media such as documents, brochures or advertising, complies with the requirements of the Certification Division; i) keep a record of all complaints made known to us relating to the product’s compliance with requirements of the relevant standard and to make these records available to the when requested; j) take appropriate action with respect to such complaints and any deficiencies found in products or services that affect compliance with the requirements for certification; k) document the actions taken. This authorization is valid until further written notice from the applicant. Sincerely Yours, Signed by: Company Name: Sonos, Inc. Contact Name: Hogan He Title of Person: Senior Compliance Engineering Address: 301 Coromar Dr,Goleta, CA 93117,United States

Docusign Envelope ID: EF5CFE20-8407-89E6-83FA-DA31CAD3FC15 CC STC 00211728 2026 TR Amazon.com Services LLC Date: 6/11/2026 Attn: FCC Office of Engineering and Technology / UL Verification Services TCB Subject: Request for Confidentiality FCC ID: 2A4DH-2763 To Whom It May Concern: Pursuant to the provisions of Sections 0.457 and 0.459 of the Commission’s rules (47 CFR §§ 0.457, 0.459), we are requesting the Commission to withhold the following attachments as confidential document from public disclosure indefinitely. • Schematic Diagram • Block Diagram • Theory of Operation • Part List • Tune up procedure 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. In additional to above mentioned documents, pursuant to Public Notice DA 04-1705 of the Commission’s policy, in order to comply with the marketing regulations in 47 CFR §2.803 and the importation rules in 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices. We are requesting the commission to grant short-term confidentiality request on the following attachments until 180 days after the grant date • External Photos • Internal Photos • Test Setup Photos • User Manual • Antenna Test Setup Photos It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Docusign Envelope ID: EF5CFE20-8407-89E6-83FA-DA31CAD3FC15 CC STC 00211728 2026 TR Best Regards Contact Name: Tunji Yusuf Title of Person: Authorized Signatory Company Name: Amazon.com Services LLC

301 Coromar Drive, Goleta, CA 93117 T (+1) 805 965 3001 F (+1) 805 965 3010 www.sonos.com Date: March 31 st , 2026 Federal Communications commission 7435 Okland Mills Road Columbia MD 21046 Subject: Signature Authorization Letter FCC Manufacturer designation: SBV To whom it may concern: I, Zibo Nelson, hereby authorize Hogan He to sign FCC related documents for Sonos, Inc. Sincerely, Name: Zibo Nelson Position: Sr. Manager, Compliance Engineering Place of issue: 301 Coromar Drive, Goleta, CA 93117 USA Date: March 31 st , 2026 Email: [email protected]

. MeasurementReportforDevice,,,UID0-,Channel0(2450.000MHz) DeviceunderTestProperties Model,ManufacturerDimensions[mm]IMEIDUTType Device,50.0x10.0x8.0Dipole ExposureConditions PhantomSection, TSL Position,Test Distance[mm] BandGroup, UID Frequency[MHz], ChannelNumber ConversionFactorTSLConductivity [S/m] TSLPermittivity Flat, HeadSimulating Liquid ,CW, 0-- 2450.000, 0 7.841.8840.4 HardwareSetup PhantomTSL,MeasuredDateProbe,CalibrationDateDAE,CalibrationDate Twin-SAMV8.0(30degprobetilt)- 2100 HBBL-600-10000Charge:xxxx,2026-04- 07 EX3DV4-SN7733,2025-09-08DAE4Sn1739,2025-09-08 ScanSetup AreaScanZoomScan GridExtents[mm]40.0x80.030.0x30.0x30.0 GridSteps[mm]10.0x10.05.0x5.0x1.5 SensorSurface[mm]3.01.4 GradedGridN/AYes GradingRatioN/A1.5 MAIAN/AN/A SurfaceDetectionVMS+6pVMS+6p ScanMethodMeasuredMeasured MeasurementResults AreaScanZoomScan Date2026-04-07,08:272026-04-07,08:33 psSAR1g[W/kg]5.025.04 psSAR10g[W/kg]2.312.36 PowerDrift[dB]-0.020.01 PowerScalingDisabledDisabled ScalingFactor[dB] TSLCorrectionNocorrectionNocorrection M2/M1[%]81.0 Dist3dBPeak[mm]9.0 Warning(s)/Error(s) DetailsAreaScanZoomScan Warning(s) Error(s) . MeasurementReportforDevice,,,UID0-,Channel0(2450.000MHz) DeviceunderTestProperties Model,ManufacturerDimensions[mm]IMEIDUTType Device,50.0x10.0x8.0Dipole ExposureConditions PhantomSection, TSL Position,Test Distance[mm] BandGroup, UID Frequency[MHz], ChannelNumber ConversionFactorTSLConductivity [S/m] TSLPermittivity Flat, HeadSimulating Liquid ,CW, 0-- 2450.000, 0 7.841.8640.4 HardwareSetup PhantomTSL,MeasuredDateProbe,CalibrationDateDAE,CalibrationDate Twin-SAMV8.0(30degprobetilt)- 2100 HBBL-600-10000Charge:xxxx,2026-04- 13 EX3DV4-SN7733,2025-09-08DAE4Sn1739,2025-09-08 ScanSetup AreaScanZoomScan GridExtents[mm]40.0x80.030.0x30.0x30.0 GridSteps[mm]10.0x10.05.0x5.0x1.5 SensorSurface[mm]3.01.4 GradedGridN/AYes GradingRatioN/A1.5 MAIAN/AN/A SurfaceDetectionVMS+6pVMS+6p ScanMethodMeasuredMeasured MeasurementResults AreaScanZoomScan Date2026-04-13,09:062026-04-13,09:12 psSAR1g[W/kg]5.265.32 psSAR10g[W/kg]2.422.49 PowerDrift[dB]0.010.03 PowerScalingDisabledDisabled ScalingFactor[dB] TSLCorrectionNocorrectionNocorrection M2/M1[%]81.0 Dist3dBPeak[mm]9.0 Warning(s)/Error(s) DetailsAreaScanZoomScan Warning(s) Error(s) . MeasurementReportforDevice,,,UID0-,Channel0(5250.000MHz) DeviceunderTestProperties Model,ManufacturerDimensions[mm]IMEIDUTType Device,50.0x10.0x8.0Dipole ExposureConditions PhantomSection, TSL Position,Test Distance[mm] BandGroup, UID Frequency[MHz], ChannelNumber ConversionFactorTSLConductivity [S/m] TSLPermittivity Flat, HeadSimulating Liquid ,CW, 0-- 5250.000, 0 5.574.6835.7 HardwareSetup PhantomTSL,MeasuredDateProbe,CalibrationDateDAE,CalibrationDate Twin-SAMV8.0(30degprobetilt)- 2100 HBBL-600-10000Charge:xxxx,2026-04- 14 EX3DV4-SN7733,2025-09-08DAE4Sn1739,2025-09-08 ScanSetup AreaScanZoomScan GridExtents[mm]40.0x80.022.0x22.0x22.0 GridSteps[mm]10.0x10.04.0x4.0x1.4 SensorSurface[mm]3.01.4 GradedGridN/AYes GradingRatioN/A1.4 MAIAN/AN/A SurfaceDetectionVMS+6pVMS+6p ScanMethodMeasuredMeasured MeasurementResults AreaScanZoomScan Date2026-04-14,09:492026-04-14,09:57 psSAR1g[W/kg]6.887.63 psSAR10g[W/kg]2.022.21 PowerDrift[dB]0.010.07 PowerScalingDisabledDisabled ScalingFactor[dB] TSLCorrectionNocorrectionNocorrection M2/M1[%]63.5 Dist3dBPeak[mm]7.3 Warning(s)/Error(s) DetailsAreaScanZoomScan Warning(s) Error(s) . MeasurementReportforDevice,,,UID0-,Channel0(5600.000MHz) DeviceunderTestProperties Model,ManufacturerDimensions[mm]IMEIDUTType Device,50.0x10.0x8.0Dipole ExposureConditions PhantomSection, TSL Position,Test Distance[mm] BandGroup, UID Frequency[MHz], ChannelNumber ConversionFactorTSLConductivity [S/m] TSLPermittivity Flat, HeadSimulating Liquid ,CW, 0-- 5600.000, 0 5.015.0435.2 HardwareSetup PhantomTSL,MeasuredDateProbe,CalibrationDateDAE,CalibrationDate Twin-SAMV8.0(30degprobetilt)- 2100 HBBL-600-10000Charge:xxxx,2026-04- 15 EX3DV4-SN7733,2025-09-08DAE4Sn1739,2025-09-08 ScanSetup AreaScanZoomScan GridExtents[mm]40.0x80.022.0x22.0x22.0 GridSteps[mm]10.0x10.04.0x4.0x1.4 SensorSurface[mm]3.01.4 GradedGridN/AYes GradingRatioN/A1.4 MAIAN/AN/A SurfaceDetectionVMS+6pVMS+6p ScanMethodMeasuredMeasured MeasurementResults AreaScanZoomScan Date2026-04-15,09:542026-04-15,10:01 psSAR1g[W/kg]7.287.98 psSAR10g[W/kg]2.112.27 PowerDrift[dB]-0.010.11 PowerScalingDisabledDisabled ScalingFactor[dB] TSLCorrectionNocorrectionNocorrection M2/M1[%]61.4 Dist3dBPeak[mm]7.4 Warning(s)/Error(s) DetailsAreaScanZoomScan Warning(s) Error(s) . MeasurementReportforDevice,,,UID0-,Channel0(5750.000MHz) DeviceunderTestProperties Model,ManufacturerDimensions[mm]IMEIDUTType Device,50.0x10.0x8.0Dipole ExposureConditions PhantomSection, TSL Position,Test Distance[mm] BandGroup, UID Frequency[MHz], ChannelNumber ConversionFactorTSLConductivity [S/m] TSLPermittivity Flat, HeadSimulating Liquid ,, 0-- 5750.000, 0 5.085.0134.5 HardwareSetup PhantomTSL,MeasuredDateProbe,CalibrationDateDAE,CalibrationDate Twin-SAMV8.0(30degprobetilt)- 2100 HBBL-600-10000Charge:xxxx,2026-05- 07 EX3DV4-SN7733,2025-09-08DAE4Sn1739,2025-09-08 ScanSetup AreaScanZoomScan GridExtents[mm]40.0x80.022.0x22.0x22.0 GridSteps[mm]10.0x10.04.0x4.0x1.4 SensorSurface[mm]3.01.4 GradedGridN/AYes GradingRatioN/A1.4 MAIAN/AN/A SurfaceDetectionVMS+6pVMS+6p ScanMethodMeasuredMeasured MeasurementResults AreaScanZoomScan Date2026-05-07,08:562026-05-07,09:04 psSAR1g[W/kg]7.127.76 psSAR10g[W/kg]2.032.23 PowerDrift[dB]0.000.03 PowerScalingDisabledDisabled ScalingFactor[dB] TSLCorrectionNocorrectionNocorrection M2/M1[%]60.7 Dist3dBPeak[mm]7.6 Warning(s)/Error(s) DetailsAreaScanZoomScan Warning(s) Error(s)

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Measurement Report for Device, BACK, WLAN 2.4GHz, UID 10012 CAB, Channel 11 (2462.000MHz) Device under Test Properties Model, Manufacturer Dimensions [mm] IMEI DUT Type Device, 103.0 x 85.0 x 30.0 Wireless Headphone Exposure Conditions Phantom Section, TSL Position, Test Distance [mm] Band Group, UID Frequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid BACK, 0.00 WLAN 2.4GHz WLAN, 10012-CAB 2462.000, 11 7.91 1.86 40.4 Hardware Setup Phantom TSL, Measured Date Probe, Calibration Date DAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2100 HBBL-600-10000 Charge:xxxx, 2026-04- 13 EX3DV4 - SN7733, 2025-09-08 DAE4 Sn1739, 2025-09-08 Scan Setup Area Scan Zoom Scan Grid Extents [mm] 120.0 x 140.0 30.0 x 30.0 x 30.0 Grid Steps [mm] 10.0 x 10.0 5.0 x 5.0 x 1.5 Sensor Surface [mm] 3.0 1.4 Graded Grid N/A Yes Grading Ratio N/A 1.5 MAIA N/A N/A Surface Detection VMS + 6p VMS + 6p Scan Method Measured Measured Measurement Results Area Scan Zoom Scan Date 2026-04-13, 10:08 2026-04-13, 10:23 psSAR1g [W/kg] 1.06 1.07 psSAR10g [W/kg] 0.498 0.515 Power Drift [dB] 0.23 -0.03 Power Scaling Disabled Disabled Scaling Factor [dB] TSL Correction No correction No correction M2/M1 [%] 78.6 Dist 3dB Peak [mm] 9.0 Warning(s) / Error(s) Details Area Scan Zoom Scan Warning(s) Error(s) . Measurement Report for Device, BACK, WLAN 5GHz, UID 10062 CAE, Channel 40 (5200.000MHz) Device under Test Properties Model, Manufacturer Dimensions [mm] IMEI DUT Type Device, 103.0 x 85.0 x 30.0 Wireless Headphone Exposure Conditions Phantom Section, TSL Position, Test Distance [mm] Band Group, UID Frequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid BACK, 0.00 WLAN 5GHz WLAN, 10062-CAE 5200.000, 40 5.57 4.56 35.7 Hardware Setup Phantom TSL, Measured Date Probe, Calibration Date DAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2100 HBBL-600-10000 Charge:xxxx, 2026-06- 01 EX3DV4 - SN7733, 2025-09-08 DAE4 Sn1739, 2025-09-08 Scan Setup Area Scan Zoom Scan Grid Extents [mm] 120.0 x 140.0 22.0 x 22.0 x 22.0 Grid Steps [mm] 10.0 x 10.0 4.0 x 4.0 x 1.4 Sensor Surface [mm] 3.0 1.4 Graded Grid N/A Yes Grading Ratio N/A 1.4 MAIA Y Y Surface Detection VMS + 6p VMS + 6p Scan Method Measured Measured Measurement Results Area Scan Zoom Scan Date 2026-06-01, 20:06 2026-06-01, 20:18 psSAR1g [W/kg] 0.182 0.209 psSAR10g [W/kg] 0.065 0.053 Power Drift [dB] -0.01 -0.08 Power Scaling Disabled Disabled Scaling Factor [dB] TSL Correction No correction No correction M2/M1 [%] 65.0 Dist 3dB Peak [mm] 4.8 Warning(s) / Error(s) Details Area Scan Zoom Scan Warning(s) Error(s) . Measurement Report for Device, BACK, WLAN 5GHz, UID 10062 CAE, Channel 56 (5280.000MHz) Device under Test Properties Model, Manufacturer Dimensions [mm] IMEI DUT Type Device, 103.0 x 85.0 x 30.0 Wireless Headphone Exposure Conditions Phantom Section, TSL Position, Test Distance [mm] Band Group, UID Frequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid BACK, 0.00 WLAN 5GHz WLAN, 10062-CAE 5280.000, 56 5.57 4.66 35.5 Hardware Setup Phantom TSL, Measured Date Probe, Calibration Date DAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2100 HBBL-600-10000 Charge:xxxx, 2026-04- 14 EX3DV4 - SN7733, 2025-09-08 DAE4 Sn1739, 2025-09-08 Scan Setup Area Scan Zoom Scan Grid Extents [mm] 120.0 x 140.0 22.0 x 22.0 x 22.0 Grid Steps [mm] 10.0 x 10.0 4.0 x 4.0 x 1.4 Sensor Surface [mm] 3.0 1.4 Graded Grid N/A Yes Grading Ratio N/A 1.4 MAIA Y Y Surface Detection VMS + 6p VMS + 6p Scan Method Measured Measured Measurement Results Area Scan Zoom Scan Date 2026-04-14, 10:17 2026-04-14, 10:26 psSAR1g [W/kg] 0.307 0.320 psSAR10g [W/kg] 0.111 0.104 Power Drift [dB] -0.08 -0.06 Power Scaling Disabled Disabled Scaling Factor [dB] TSL Correction No correction No correction M2/M1 [%] 61.2 Dist 3dB Peak [mm] 6.8 Warning(s) / Error(s) Details Area Scan Zoom Scan Warning(s) Error(s) . Measurement Report for Device, EDGE BOTTOM, WLAN 5GHz, UID 10062 CAE, Channel 64 (5320.000MHz) Device under Test Properties Model, Manufacturer Dimensions [mm] IMEI DUT Type Device, 103.0 x 85.0 x 30.0 Wireless Headphone Exposure Conditions Phantom Section, TSL Position, Test Distance [mm] Band Group, UID Frequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid EDGE BOTTOM, 0.00 WLAN 5GHz WLAN, 10062-CAE 5320.000, 64 5.57 4.66 35.5 Hardware Setup Phantom TSL, Measured Date Probe, Calibration Date DAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2100 HBBL-600-10000 Charge:xxxx, 2026-06- 01 EX3DV4 - SN7733, 2025-09-08 DAE4 Sn1739, 2025-09-08 Scan Setup Area Scan Zoom Scan Grid Extents [mm] 60.0 x 120.0 22.0 x 22.0 x 22.0 Grid Steps [mm] 10.0 x 10.0 4.0 x 4.0 x 1.4 Sensor Surface [mm] 3.0 1.4 Graded Grid N/A Yes Grading Ratio N/A 1.4 MAIA Y N/A Surface Detection VMS + 6p VMS + 6p Scan Method Measured Measured Measurement Results Area Scan Zoom Scan Date 2026-06-01, 15:27 2026-06-01, 15:38 psSAR1g [W/kg] 0.676 0.870 psSAR10g [W/kg] 0.233 0.253 Power Drift [dB] 0.03 0.07 Power Scaling Disabled Disabled Scaling Factor [dB] TSL Correction No correction No correction M2/M1 [%] 64.2 Dist 3dB Peak [mm] 6.5 Warning(s) / Error(s) Details Area Scan Zoom Scan Warning(s) Error(s) . Measurement Report for Device, BACK, WLAN 5GHz, UID 10062 CAE, Channel 100 (5500.000MHz) Device under Test Properties Model, Manufacturer Dimensions [mm] IMEI DUT Type Device, 103.0 x 85.0 x 30.0 Wireless Headphone Exposure Conditions Phantom Section, TSL Position, Test Distance [mm] Band Group, UID Frequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid BACK, 0.00 WLAN 5GHz WLAN, 10062-CAE 5500.000, 100 4.97 4.97 35.3 Hardware Setup Phantom TSL, Measured Date Probe, Calibration Date DAE, Calibration Date Twin-SAM V8.0 (30deg probe…

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Annual Verification Result Dipole2450 Head TSL Target Value Measure Value Difference R（Ω） X（jΩ） R（Ω） X（jΩ） R（Ω） X（jΩ） Impedance 52.71 4.199 51.24 -4.500 -1.47 -8.70 Return loss(dB) -26.266 -26.73 1.8% Measure Date 15-Dec-25 Annual Verification Result Dipole5250 Head TSL Target Value Measure Value Difference R（Ω） X（jΩ） R（Ω） X（jΩ） R（Ω） X（jΩ） Impedance 50.47 -4.638 45.49 0.897 -4.98 5.53 Return loss(dB) -26.679 -26.35 -1.2% Measure Date 16-Dec-25 Annual Verification Result Dipole5600 Head TSL Target Value Measure Value Difference R（Ω） X（jΩ） R（Ω） X（jΩ） R（Ω） X（jΩ） Impedance 52.46 1.477 50.60 -3.070 -1.86 -4.55 Return loss(dB) -31.049 -30.16 -2.9% Measure Date 16-Dec-25 Annual Verification Result Dipole5750 Head TSL Target Value Measure Value Difference R（Ω） X（jΩ） R（Ω） X（jΩ） R（Ω） X（jΩ） Impedance 56.34 1.643 55.58 -0.446 -0.76 -2.09 Return loss(dB) -24.215 -25.51 5.3% Measure Date 16-Dec-25

The results reported herein have been performed in accordance with the laboratory’s terms of accreditation. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report apply to the test sample(s) mentioned above at the time of the testing period only and are not to be used to indicate applicability to other similar products. SAR EVALUATION REPORT FCC 47 CFR § 2.1093 IEEE Std. 1528-2013 For Wireless Headphone MODEL NUMBER: S52A REPORT NUMBER: 4792176316-1-SAR-1 ISSUE DATE: June 2, 2026 FCC ID: SBVRM052 Prepared for SONOS, INC. 301 COROMAR DR. GOLETA, CA 93117, USA Prepared by UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch Room 101, Building 2, No.4, Information Road, Songshan Lake, Dongguan, Guangdong, China Tel: +86 769 22038881 Fax: +86 769 33244054 Website: www.ul.com Website: www.ul.com REPORT NO.: 4792176316-1-SAR-1 Page 2 of 37 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0036 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. Revision History Rev. Issue Date Revisions Revised By V0 June 2, 2026 Initial Issue \ Note: 1) This test report is only published to and used by the applicant, and it is not for evidence purpose in China. 2) The measurement result for the sample received is <Pass> according to < IEEE Std. 1528>when <Simple Acceptance> decision rule is applied. REPORT NO.: 4792176316-1-SAR-1 Page 3 of 37 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0036 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. Table of Contents 1. Attestation of Test Results .......................................................................................................... 5 2. Test Specification, Methods and Procedures ............................................................................ 6 3. Facilities and Accreditation ......................................................................................................... 7 4. SAR Measurement System & Test Equipment ........................................................................... 8 4.1. SAR Measurement System .............................................................................................................. 8 4.2. SAR Scan Procedures ..................................................................................................................... 9 4.3. Test Equipment .............................................................................................................................. 11 5. Measurement Uncertainty ......................................................................................................... 12 6. Device Under Test (DUT) Information ....................................................................................... 13 6.1. DUT Description............................................................................................................................. 13 6.2. Wireless Technology ...................................................................................................................... 13 7. Conducted Output Power Measurement and tune-up tolerance ............................................ 14 7.1. Test Results of 2.4GHz Wi-Fi ......................................................................................................... 14 7.2. Test Results of 5GHz Wi-Fi ............................................................................................................ 15 7.3. Test Results of BT ......................................................................................................................... 17 7.4. Duty Cycle ..................................................................................................................................... 18 8. Test Configuration ..................................................................................................................... 20 8.1. Wi-Fi Test Configuration .................................................................................................................... 20 8.1.1. Initial Test Position Procedure .................................................................................................... 20 8.1.2. Initial Test Configuration Procedure ............................................................................................ 20 8.1.3. Sub Test Configuration Procedure.............................................................................................. 20 8.1.4. 2.4GHz Wi-Fi SAR Test Procedures ........................................................................................... 20 8.1.5. 5GHz Wi-Fi SAR Test Procedures .............................................................................................. 21 8.2. 2.4GHz BT SAR Test Requirements ................................................................................................. 22 8.3. Repeated measurements .................................................................................................................. 22 9. RF Exposure Conditions ........................................................................................................... 23 10. Dielectric Property Measurements & System Check ............................................................... 24 10.1. Dielectric Property Measurements ................................................................................................. 24 10.2. System Check ................................................................................................................................ 26 11. Measured and Reported (Scaled) SAR Results ....................................................................... 28 11.1. SAR Test…

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REPORT NO.: 4792176316-1-RF-1 Page 112 of 129 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0035 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. BLE_2M_Ant1_High_2478 QHS_2M_Ant1_Low_2404 QHS_2M_Ant1_High_2478 REPORT NO.: 4792176316-1-RF-1 Page 113 of 129 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0035 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. QHS_6M_Ant1_Low_2404 QHS_6M_Ant1_High_2478 REPORT NO.: 4792176316-1-RF-1 Page 114 of 129 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0035 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. 11.6. APPENDIX F: CONDUCTED SPURIOUS EMISSION 11.6.1. Test Result Test Mode Antenna Frequency[MHz] FreqRange [MHz] Result[dBm] Limit[dBm] Verdict BLE_1M Ant1 2402 Reference 5.15 --- PASS 30~1000 -49.92 ≤-14.85 PASS 1000~26500 -40.29 ≤-14.85 PASS 2440 Reference 6.06 --- PASS 30~1000 -50.2 ≤-13.94 PASS 1000~26500 -41.29 ≤-13.94 PASS 2480 Reference 6.06 --- PASS 30~1000 -50.47 ≤-13.94 PASS 1000~26500 -40.96 ≤-13.94 PASS BLE_2M Ant1 2404 Reference 5.40 --- PASS 30~1000 -49.89 ≤-14.6 PASS 1000~26500 -40.72 ≤-14.6 PASS 2440 Reference 6.20 --- PASS 30~1000 -50.09 ≤-13.8 PASS 1000~26500 -41.48 ≤-13.8 PASS 2478 Reference 6.04 --- PASS 30~1000 -50.29 ≤-13.96 PASS 1000~26500 -39.15 ≤-13.96 PASS QHS_2M Ant1 2404 Reference 8.97 --- PASS 30~1000 -51.09 ≤-11.03 PASS 1000~26500 -40.02 ≤-11.03 PASS 2440 Reference 9.80 --- PASS 30~1000 -50.65 ≤-10.2 PASS 1000~26500 -40.24 ≤-10.2 PASS 2478 Reference 10.44 --- PASS 30~1000 -50.06 ≤-9.56 PASS 1000~26500 -41.07 ≤-9.56 PASS QHS_6M Ant1 2404 Reference 10.24 --- PASS 30~1000 -48.99 ≤-9.76 PASS 1000~26500 -39.99 ≤-9.76 PASS 2440 Reference 11.06 --- PASS 30~1000 -50.83 ≤-8.94 PASS 1000~26500 -41.18 ≤-8.94 PASS 2478 Reference 9.89 --- PASS 30~1000 -50.66 ≤-10.11 PASS 1000~26500 -41.08 ≤-10.11 PASS REPORT NO.: 4792176316-1-RF-1 Page 115 of 129 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0035 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. 11.6.2. Test Graphs BLE_1M_Ant1_2402_0~Reference BLE_1M_Ant1_2402_30~1000 BLE_1M_Ant1_2402_1000~26500 REPORT NO.: 4792176316-1-RF-1 Page 116 of 129 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0035 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. BLE_1M_Ant1_2440_0~Reference BLE_1M_Ant1_2440_30~1000 BLE_1M_Ant1_2440_1000~26500 REPORT NO.: 4792176316-1-RF-1 Page 117 of 129 UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch FORM NO: 10-SL-F0035 This report shall not be reproduced except in full, without the written approval of UL Verification Services (Guangzhou) Co., Ltd, Song Shan Lake Branch. BLE_1M_Ant1_2480_0~Reference BLE_1M_Ant1_2480_30~1000 BLE_1M_Ant1_2480_1000~26500 REPORT NO.: 4792176316-1-RF-1 Page 118 of 129 UL Verificati…

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