2BU3H-M1Microphone

FCC Warning This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: —Reorient or relocate the receiving antenna. —Increase the separation between the equipment and receiver. —Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. —Consult the dealer or an experienced radio/TV technician for help. Note: The Grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. such modifications could void the user's authority to operate the equipment. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Shenzhen Fixed Star Technology Co., Ltd. No. 21, Tiankuo Road, Tianliao Community, Yutang Sub-district, Guangming District, Shenzhen City, Guangdong Province China Date: 03-30-2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2BU3H-M1 FRN: 0038112348 US Agent – Attestation Statement / Part 2.911(d)(7) Shenzhen Fixed Star Technology Co., Ltd. certifies, that as of 03-30-2026, we have designated FCC US Agent, LLC to accept service of process on our behalf for FCC ID: 2BU3H-M1 Shenzhen Fixed Star Technology Co., Ltd. accepts to maintain an agent of service of process in the United States for no less than one 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. FCC US Agent, LLC, accepts as of the date of the filing of this application, the obligation of being the designated agent for the purpose of accepting service of process on behalf of Shenzhen Fixed Star Technology Co., Ltd. for FCC ID: 2BU3H-M1 Designated Agent Information: Company Name: FCC US Agent, LLC FRN: 0033402884 Address: 3722 Illinois Avenue, Saint Charles, IL, 60174, USA Contact Person: Tim Payne Phone: 708-571-3148 Email: [email protected] Sincerely, Company: Shenzhen Fixed Star Technology Co., Ltd. Designated Agent: FCC US Agent, LLC Company Representative: liu Bing hua Designated Agent Representative: Tim Payne Signature: Signature:

Shenzhen Fixed Star Technology Co., Ltd. Date: 03‐18‐2026 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: 2BU3H‐M1) [Shenzhen Fixe d Star 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) liu Bing hua Shenzhen Fixed Star Technology Co., Ltd. Date: 03‐18‐2026 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: 2BU3H‐M1) [Shenzhen Fixe d Star 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) liu Bing hua

Shenzhen Fixed Star Technology Co., Ltd. Date: Ma r. 18, 2026 Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2BU3H-M1 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Long-term confidentiality: Schematics Block Diagram O perational Description Schematics.pdf Block Diagram.pdf O perational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Shenzhen Fixed Star Technology Co., Ltd. Signature Bing hua liu / Project Manager Typed name and Title

Shenzhen Fixed Star Technology Co., Ltd. FCC ID: 2BU3H-M1 POWER OF ATTORNEY Date: Mar. 18, 2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern: We, the undersigned, hereby authorize Waltek Testing Group Co., Ltd. (Deval Qin) on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Waltek Testing Group Co., Ltd. (Deval Qin) on our behalf shall have the same effect as acts of our own. This authorization expires on Mar. 17, 2027. Sincerely, Shenzhen Fixed Star Technology Co., Ltd. Signature Bing hua liu / Project Manager Typed name and Title

Appendix-M1-Photos Page 3 of 9 2. Photographs –Constructional Details 2.1. EUT – External View Model M1 FCC ID: 2BU3H-M1 Appendix-M1-Photos Page 4 of 9 Appendix-M1-Photos Page 5 of 9 Appendix-M1-Photos Page 6 of 9

Label and Label Location

Appendix-M1-Photos Page 7 of 9 2.2. EUT – Internal View Model M1 FCC ID: 2BU3H-M1 Appendix-M1-Photos Page 8 of 9 Appendix-M1-Photos Page 9 of 9 ======End======

Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Page 1 of 8 TEST REPORT Referen ce No. .................... : WTH26D01015648W003 FCC ID ................................ : 2BU3H-M1 Applicant ............................ : Shenzhen Fixed Star Technology Co.,Ltd. Address .............................. : No. 21, Tiankuo Road, Tianliao Community, Yutang Sub-district, Guangming District, Shenzhen City, Guangdong Province, P.R.China Manufacturer ..................... : Shenzhen Zhengfangxin Technology Co., Ltd. Address .............................. : Room 307, Building 3, Xifa Zone B, No. 149 Gonghe Industrial Road, Bao'an District, Shenzhen City Product ............................... : Microphone Model(s). ............................ : M1 Standards........................... : 47CFR FCC Part 2 Subpart J Section 2.1093 Date of Receipt Sample .... : 2026-01-28 Date of Test ....................... : 2026-02-05 to 2026-02-25 Date of Issue ...................... : 2026-03-31 Test Result ......................... : Pass Remarks: The res ults shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Estel Qian / Pro ject Engineer Deval Qin/ Designated Reviewer Reference No.: WTH26D01015648W003 Page 2 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 2. Contents Page 1 COVER PAGE ........................................................................................................................................... 1 2. CONTENTS ............................................................................................................................................... 2 3. REVISION HISTORY ................................................................................................................................. 3 4. GENERAL INFORMATION ....................................................................................................................... 4 4.1. GENERAL DESCRIPTION OF E.U.T.................................................................................................... 4 4.2. DETAILS OF E.U.T. ......................................................................................................................... 4 4.3. TEST FACILITY ................................................................................................................................ 5 4.4. SUBCONTRACTED ........................................................................................................................... 5 4.5. ABNORMALITIES FROM STANDARD CONDITIONS ................................................................................ 5 5. TEST SUMMARY ...................................................................................................................................... 6 6. RF EXPOSURE ......................................................................................................................................... 7 6.1. PROCEDURES AND REQUIREMENTS ................................................................................................. 7 6.2. CALCULATION METHOD ................................................................................................................... 7 6.3. TEST RESULT ................................................................................................................................. 8 Reference No.: WTH26D01015648W003 Page 3 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 3. Revision History Test Report No. Date of Receipt Sample Date of Test Date of Issue Purpose CommentApproved WTH26D01015648W003 2026-01-28 2026-02-05 to 2026-02-25 2026-03-31 Original - Valid Reference No.: WTH26D01015648W003 Page 4 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 4. General Information 4.1. General Description of E.U.T. Product: Microphone Model(s): M1 Model Description: N/A Test Sample No.: 1-1/1 Bluetooth Version: 5.3 Hardware Version: ZFX-K12-MIC-B-V1.3 Software Version: S2423TX04 4.2. Details of E.U.T. Operation Frequency: 2402~2480MHz Max. RF output power: 0.09dBm Modulation Technology: GFSK Antenna installation: PCB antenna Antenna Gain: 5.3dBi Note: #: The antenna gain is provided by the applicant, and the applicant should be responsible for its authenticit y, WALTEK lab has not verified the authenticity of its information. Ratings: Charging Voltage is DC 5V 3.7V 18650 battery 800mAh Reference No.: WTH26D01015648W003 Page 5 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 4.3. Test Facility The test facility has a test site registered with the following organizations: ISED CAB identifier: CN0013. Test Firm Registration No.: 7760A. Waltek Testing Group Co., Ltd. Has been registered and fully described in a report filed with the Industry Canada. The acceptance letter from the Industry Canada is maintained in our files. Registration number 7760A, October 15, 2016. FCC Designation No.: CN1201. Test Firm Registration No.: 523476. Waltek Testing Group Co., Ltd. EMC Laboratory has been registered and fully described in a report filed with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. Registration number 523476, September 10, 2019. 4.4. Subcontracted Whether parts of tests for the product have been subcontracted to other labs: Yes No If Yes, list the related test items and lab information: Test Lab: N/A Lab address: N/A Test items: N/A 4.5. Abnormalities from Standard Conditions None. Reference No.: WTH26D01015648W003 Page 6 of 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 5…

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Summary ITEMANT SPEC Model Name2.4GANT Antenna platePCB antenna Center Frequency 2400MHz2450MHz2500MHz 4.4dBi5.3dBi 3.7dBi MAX. Gain 5.3dBi PolarizationHorizontal and Vertical Impedance50Ohm Manufacture AntennaPhoto&Length(mm) Shenzhen Zhengfangxin Technology Co., Ltd. Frequency （MHz） Gain(dBi) HorizontalVertical MAXMINMAXMIN 2400 3.7-22.54.4-6.4 2450 5.0-19.75.3-5.8 25003.7-19.23.7-8.0

Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Pa ge 1 of 33 TEST REPORT Referen ce No. .................... : WTH26D01015648W002 FCC ID ................................ : 2BU3H-M1 Applicant ............................ : Shenzhen Fixed Star Technology Co.,Ltd. Address .............................. : No. 21, Tiankuo Road, Tianliao Community, Yutang Sub-district, Guangming District, Shenzhen City, Guangdong Province, P.R.China Manufacturer .................... : Shenzhen Zhengfangxin Technology Co., Ltd. Address .............................. : Room 307, Building 3, Xifa Zone B, No. 149 Gonghe Industrial Road, Bao'an District, Shenzhen Cit y Product ............................... : Microphone Model(s). ............................ : M1 Standards........................... : FCC 47CFR Part 15.247 Date of Receipt Sample .... : 2026-01-28 Date of Test ....................... : 2026-02-05 to 2026-02-25 Date of Issue ...................... : 2026-03-31 Test Result ......................... : Pass Remarks: The res ults shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Estel Qian / Project Engineer Dev al Qin / Designated Reviewer Reference No.: WTH26D01015648W002 Page 2 of 33 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 2 Contents Page 1 COVER PAGE ........................................................................................................................................... 1 2 CONTENTS ............................................................................................................................................... 2 3 REVISION HISTORY ................................................................................................................................. 4 4 GENERAL INFORMATION ....................................................................................................................... 5 4.1 General Description of E.U.T. ....................................................................................................... 5 4.2 Details of E.U.T. ............................................................................................................................ 5 4.3 Channel List .................................................................................................................................. 5 4.4 Test Facility ................................................................................................................................... 6 4.5 Subcontracted ............................................................................................................................... 6 4.6 Abnormalities from Standard Conditions ...................................................................................... 6 4.7 Test Mode ..................................................................................................................................... 6 5 TEST SUMMARY ...................................................................................................................................... 7 6 EQUIPMENT USED DURING TEST ......................................................................................................... 8 6.1 Equipments List ............................................................................................................................ 8 6.2 Description of Support Units ......................................................................................................... 9 6.3 Measurement Uncertainty ............................................................................................................ 9 6.4 Test Equipment Calibration .......................................................................................................... 9 7 DUTY CYCLE .......................................................................................................................................... 10 8 CONDUCTED EMISSION ....................................................................................................................... 11 8.1 E.U.T. Operation ......................................................................................................................... 11 8.2 EUT Setup .................................................................................................................................. 11 8.3 Measurement Description ........................................................................................................... 11 8.4 Conducted Emission Test Result ............................................................................................... 1 2 9 RADIATED EMISSIONS ......................................................................................................................... 14 9.1 EUT Operation ............................................................................................................................ 14 9.2 Test Setup .................................................................................................................................. 15 9.3 Spectrum Analyzer Setup ........................................................................................................... 16 9.4 Test Procedure ........................................................................................................................... 17 9.5 Corrected Amplitude & Margin Calculation ................................................................................ 17 9.6 Summary of Test Results .........................................................…

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Appendix-M1-Photos Page 1 of 9 1. Test Setup photos Model M1 FCC ID: 2BU3H-M1 1.1 Photograph – Conducted Emission For Conducted Emission Test Site 1# 1.2 Photograph – Radiated Emissions For 9kHz-30MHz Test Site 2# Appendix-M1-Photos Page 2 of 9 For 30MHz-1000MHz Test Site 2# For Above 1GHz Test Site 1#