C3K2152Wireless Accessory

Date: 2026-07-14 FCC ID: C3K2152 To the attention of Federal Communications Commission Authorization and Evaluation Division Declaration letter for label requirement The label is permanent affixed in the battery compartment, and the EUT will be selling to market without the battery installed. The users can see the label during the battery installation process. The battery cover can be opened without any special tools. Sincerely yours, ----------------------------------- Albert Huang, EMC/Safety Engineer Microsoft Corporation Tel: (86-755)8611 8676 Fax: (86-755)2655 1121 E- mail: [email protected]

Date: 2026-07-14 FCC ID: C3K2152 To the attention of Federal Communications Commission Authorization and Evaluation Division Attestation Statements Attestation Statements Part 2.911(d)(5)(i) Filing Microsoft Corporation certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receivingan equipment authorization pursuant to section 2.903 of the FCC rules. Attestation Statements Part 2.911(d)(5)(ii) Filing Microsoft Corporation 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 yours, ----------------------------------------------- Albert Huang Compliance Engineer, Microsoft Corporation

Date: March 23, 2026 FederalCommunicationsCommissions Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 RE: CFR 47 §2.911 (d)(7) Agent Designation Attestation Grantee Code: C3K To whom it may concern: Microsoft Corporation (“the applicant”)as required by section §2.911(d)(7), will also serve as the agent for service of process. The applicant acknowledges that they will maintain an agent for no less than one year after thegranteehas terminatedall marketing andimportationortheconclusion ofanyCommission- 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. Company Name:MicrosoftCorporation Contact Person: Hasnain Syed FCC FRN: 0006275291 CompanyUSAddress:OneMicrosoftWay,RedmondWA98052 Email: [email protected] Sincerely, Name: Hasnain Syed Title/Company: Sr. Director EMC/SI/RF Compliance, Microsoft Corporation

Microsoft Corporation is an equal opportunity employer. 2026-7-14 Federal Communications Commission 7435 Oakland Mills Road Columbia MD 21046 Subject: Request for Confidentiality for FCC ID: C3K2152 To Whom It May Concern: Pursuant to the provisions of the Commission’s rules 47 CFR sections 0.457(d) and 0.459, we are requesting the Commission to withhold the following attachments as confidential document from public disclosure indefinitely. • Block Diagram • Schematics • Operational Description The above mentioned documents contain detailed system and equipment descriptions that are considered as proprietary information in the operation of the equipment. Public disclosure of the above documents might be harmful to our company and would give competitors 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 on the following attachments until 2027-1-10. Microsoft Corporation is an equal opportunity employer. • External Photos • Test Setup Photos • User’s Manual • Internal Photos It is our understanding that all measurement test reports, FCC ID label format and correspondence during certification review process cannot be granted as confidential documents and the information will be available for public review once the grant of equipment authorization is issued. Sincerely, Albert Huang Compliance Engineer, Microsoft Corporation.

Microsoft Corporation is an equal opportunity employer. 2026-7-14 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 Agency Authorization Letter To whom it may concern: We, the undersigned Microsoft ® Corporation hereby authorize Vikki Hsu, Specialist of Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch (“BV CPS Taoyuan”) to act on our behalf in all matters relating to all processes required in the FCC Part 15C approval and any communication needed with the national authority. Any and all acts carried out by Vikki Hsu / Specialist of BV CPS Taoyuan on our behalf shall have the same effects as acts of our own. This authorization is limited to the following products： Microsoft Model No ：2152 If you have any questions regarding the authorization, please don’t hesitate to contact us. Thank you! Sincerely, Albert Huang Compliance Engineer, Microsoft Corporation.

Microsoft Corporation is an equal opportunity employer. Subject: Authorized signatories February 26, 2019 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 AGENCY AUTHORIZATION LETTER FOR MICROSOFT EMPLOYEES To whom it may concern, I, the undersigned hereby authorize the following, to act on my behalf, as the agent(s), in all matters relating to all processes for FCC equipment authorization for Microsoft® Corporation (Grantee Code: C3K). Hasnain Syed Anindita Mitra David Johnson Michael Boucher Kyle Chen Chaitrali Limaye Wei Sun Zachary Gray Daniel Salinas Vishwas Varadanahalli Narayan Albert Huang Mengni Yin Choon Sian Ooi Nisha Nandakumar If you have any questions regarding the authorization, please don’t hesitate to contact me. Sincerely, Hasnain Syed Sr. Director, EMC/SI & RF Compliance Microsoft Corporation Email: [email protected]

Label aƯixed in the battery compartment Model: 2152 FCC ID: C3K2152 IC: 3048A-2152 CAN ICES-3(B)/NMB-3(B)

Report No.: MFBEMX-WTW-P26030419 R1 Page No. 1 / 8 Report Format Version: 7.1.0 Reference No.: BEMX-WTW-P26030419 Cancels and replaces the report No.: MFBEMX-WTW-P26030419 dated 2026/7/6 RF EXPOSURE REPORT CERTIFICATE OF CONFORMITY FCC Rule Part: FCC Part 2 (Section 2.1093) Report No.: MFBEMX-WTW-P26030419 R1 FCC ID: C3K2152 Product: Wireless Accessory Brand: Microsoft Model No.: 2152 Received Date: 2026/6/2 Test Date: 2026/6/11 Issued Date: 2026/7/29 Applicant: MICROSOFT CORPORATION Address: ONE MICROSOFT WAY REDMOND, WA 98052-6399, U.S.A 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: No. 47-2, 14th Ling, Chia Pau Vil., Lin Kou Dist., New Taipei City, Taiwan FCC Registration / Designation Number: 198487 / TW2021 Approved by: , Date: 2026/7/29 Jeremy Lin / Project Engineer This test report consists of 8 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 : Vivian Chen / Senior 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.: MFBEMX-WTW-P26030419 R1 Page No. 2 / 8 Report Format Version: 7.1.0 Reference No.: BEMX-WTW-P26030419 Cancels and replaces the report No.: MFBEMX-WTW-P26030419 dated 2026/7/6 Table of Contents Release Control Record ....................................................................................................................................................... 3 1 Certificate .................................................................................................................................................................... 4 2 Applicable RF Exposure Limit .................................................................................................................................. 5 3 Test Results ................................................................................................................................................................ 6 4 Conclusion .................................................................................................................................................................. 7 5 Information of the Testing Laboratories .................................................................................................................. 8 Report No.: MFBEMX-WTW-P26030419 R1 Page No. 3 / 8 Report Format Version: 7.1.0 Reference No.: BEMX-WTW-P26030419 Cancels and replaces the report No.: MFBEMX-WTW-P26030419 dated 2026/7/6 Release Control Record Issue No. Description Date Issued MFBEMX-WTW-P26030419 Original release. 2026/7/6 MFBEMX-WTW-P26030419 R1 Modify product name. 2026/7/29 Report No.: MFBEMX-WTW-P26030419 R1 Page No. 4 / 8 Report Format Version: 7.1.0 Reference No.: BEMX-WTW-P26030419 Cancels and replaces the report No.: MFBEMX-WTW-P26030419 dated 2026/7/6 1 Certificate Product: Wireless Accessory Brand: Microsoft Test Model: 2152 Sample Status: Engineering sample Applicant: MICROSOFT CORPORATION Test Date: 2026/6/11 FCC Rule Part: FCC Part 2 (Section 2.1093) Standard: KDB 447498 D04 Interim General RF Exposure Guidance v01 The above equipment has been tested by Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch, 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 RF characteristics under the conditions specified in this report. Report No.: MFBEMX-WTW-P26030419 R1 Page No. 5 / 8 Report Format Version: 7.1.0 Reference No.: BEMX-WTW-P26030419 Cancels and replaces the report No.: MFBEMX-WTW-P26030419 dated 2026/7/6 2 Applicable RF Exposure Limit § 1.1310 Radiofrequency radiation exposure limits. (a) Specific absorption rate (SAR) shall be used to evaluate the environmental impact of human exposure to radiofrequency (RF) radiation as specified in § 1.1307(b) of this part within the frequency range of 100 kHz to 6 GHz (inclusive). (b) The SAR limits for occupational/controlled exposure are 0.4 W/kg,…

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RF Technology Center 1 Foxlink Confidential & Proprietary Cheng Uei Precision Industry Co., LTD. RF Technology Center No. 18, Chung Shan Rd., Tu Cheng City, New Taipei City, 23680, Taiwan, R. O. C. Tel: 886-2-2269-9888 Fax: 886-2-2267-3672 Ferguson EV2 phase Antenna Report Test date: 2026/06/25 Test person: Nick Lu RF Technology Center 2 Foxlink Confidential & Proprietary Contents FreeSpace Characteristics Testing Setup(Passive Testing)------------------------------------------3 Antenna S Parameter(Config. A( 石墨黑 )-2)----------------------4 Antenna Gain Table & 3D Pattern-------------------------------------5 Conclusion---------------------------------------------------------------------6 RF Technology Center 3 Foxlink Confidential & Proprietary Testing Setup 1. 1.Equipment Setup - S parameter •Test Procedure 1.1 Set start and stop frequency and Calibrate the NA with 50 ohm calibration kit 1.2 Connect the NA cable to DUT antenna via SMA or I-PAX connector. 1.3 Measure the DUT antenna performance in the free space and record the s11. 2. Testing Environment - Passive Testing DUT Lab standard ： 3D Chamber for CTIA standard Chamber size ： 7.2 * 3.6 * 3.6(meter) Chamber type: Fully anechoic Chamber Chamber usable frequency range ： 700~6000MHz Measurement instrument ： Network Analyzer Measurement Software ： EMQuest (ETS-Lindgren) Calibration Date:2026/03/20 DUT ： Ferguson EV2 phase Sample DUT Antenna type ： PIFA ETS-Lindgren AMS-8500 Horn Antenna DUT Area X Z Y RF Technology Center 4 Foxlink Confidential & Proprietary FreeSpace (Config. A( 石墨黑 )-2) Return LossVSWR Smith Chart RF Technology Center 5 Foxlink Confidential & Proprietary Antenna Gain table&3DPattern 2480 MHz2441 MHz2402 MHzFrequency (MHz) 2.4GHz 250024802450244124022400Frequency (MHz) -3.73-3.66-3.13 -2.63-3.71 -3.81 Average Gain (dBi) 2.352.413.043.202.392.27 Peak Gain (dBi) 42.3143.0348.5854.4942.4841.56Efficiency(%) 45.40 Average Efficiency (%) RF Technology Center 6 Foxlink Confidential & Proprietary Conclusion This experiment tested four black and white accessory using an EV2 stage prototype. Antenna testing was conducted in free space, and the measured average antenna efficiency ranged from 44% to 46%.

Report No.: RFBEMX-WTW-P26030419 R1 Page No. 1 / 33 Report Format Version: 7.2.0 Reference No.: BWIN-WTW-P26030419 Cancels and replaces the report No.: RFBEMX-WTW-P26030419 dated 2026/7/6 TEST REPORT CERTIFICATE OF CONFORMITY Standard: 47 CFR FCC Part 15, Subpart C (Section 15.247) Report No.: RFBEMX-WTW-P26030419 R1 FCC ID: C3K2152 Product: Wireless Accessory Brand: Microsoft Model No.: 2152 Received Date: 2026/6/2 Test Date: 2026/6/10 ~ 2026/6/11 Issued Date: 2026/7/29 Applicant: MICROSOFT CORPORATION Address: ONE MICROSOFT WAY REDMOND, WA 98052-6399, U.S.A 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: No. 47-2, 14th Ling, Chia Pau Vil., Lin Kou Dist., New Taipei City, Taiwan FCC Registration / Designation Number: 198487 / TW2021 Approved by: , Date: 2026/7/29 Jeremy Lin / Project Engineer This test report consists of 33 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 : Vivian Chen / Senior 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.: RFBEMX-WTW-P26030419 R1 Page No. 2 / 33 Report Format Version: 7.2.0 Reference No.: BWIN-WTW-P26030419 Cancels and replaces the report No.: RFBEMX-WTW-P26030419 dated 2026/7/6 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 ..................................................................................................................................... 7 3.3 Channel List .............................................................................................................................................................. 8 3.4 Test Mode Applicability and Tested Channel Detail .................................................................................................. 8 3.5 Duty Cycle of Test Signal .......................................................................................................................................... 8 3.6 Test Program Used and Operation Descriptions ...................................................................................................... 9 3.7 Connection Diagram of EUT and Peripheral Devices .............................................................................................. 9 4 Test Instruments ...................................................................................................................................................... 10 4.1 RF Output Power .................................................................................................................................................... 10 4.2 Power Spectral Density .......................................................................................................................................... 10 4.3 6 dB Bandwidth ...........................................................................................…

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