2A5PQ-AS203Wireless Microphone

Beijing Viisan Technology Co., Ltd. U.S. Agent Designation for Service of Process (Applicant and U.S. Agent are Separate Parties) TO: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 ATTENTION: FCC Certification – Section 2.911(d)(7) Information Designated U.S. Agent Company Name: Baihetian Innovative Solutions FRN: 0033401605 Contact Name: Kenneth Young Street Address: 6837 Chase Rd City/Province/Zip: Dearborn, MI 48126 Telephone No: 313-395-3113 Email: [email protected] This letter is to confirm that we (“Baihetian Innovative Solutions) have accepted the responsibility to act as the Designated U.S. Agent for Service of Process as required by section 47 CFR 2.911(d)(7) on behalf of the Applicant noted below. U.S. Agent Signature: Date: Aug 13, 2025 Signed by (Printed Name/Title): Kenneth Young/Manager The Applicant acknowledges that they must maintain an agent for no less than one year after terminating all marketing and importation OR the conclusion of any Commission-related proceeding involving the equipment. The applicant further acknowledges their responsibility to inform the FCC whenever the Designated U.S. Agent information above changes. Applicant Company name: Beijing Viisan Technology Co., Ltd. Grantee Code: 2A5PQ FRN: 0032100448 Contact Name: Nicky Huang Street Address: Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District City/Province/Zip: Beijing, 100193 China Telephone No: +86-10-82826362 Email: [email protected] Applicant Signature: Date:2025-08-13 Signed by (Printed Name/Title): Nicky Huang / Product Manager FCC ID：2A5PQ-AS203 Aug 2025

Beijing Viisan Technology Co., Ltd. Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China Attestation Statements Not Covered EntityApplicant &Not Covered Equipment To: Federal Communications CommissionDate: Aug. 13, 25 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Information Required by Section 2.911(d)(5)(i)& (ii) FCC ID: 2A5PQ-AS203 Beijing Viisan 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, established pursuant to § 1.50002 of reference chapter, as an entity producing “covered” communication equipment. The equipment for which authorization is sought is not “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List that prohibited from receiving an equipment authorization pursuant to section § 2.903of the FCC rules. Sincerely yours, Applicant Signature Printed Name: Nicky Huang Title: Product Manager Address: Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China Tel.: +86-10-82826362 Email: [email protected]

Beijing Viisan Technology Co., Ltd. Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China 1| Page Attestation Statements To: Federal Communications Commission Date: Aug. 13, 25 7435 Oakland Mills Road, Columbia, MD 21046, USA Subject: Attestation of Compliance with FCC Covered List Software Requirements FCC ID: 2A5PQ-AS203 Product Name: Wireless Microphone This letter serves as an attestation that the equipment identified above ☐ is / ☒ is not (select one) "covered" software as defined under the Federal Communications Commission (FCC) Covered List requirements, as outlined in FCC 22-84 and KDB 986446. Specifically, the undersigned certifies that the equipment for which authorization is sought: 1. Does not contain cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors, assignees, parents, subsidiaries, affiliates, or any entity that has rebranded or relabeled software produced by the aforementioned entities. 2. Does not have the capability to store, run, or deliver any software identified on the FCC Covered List, including but not limited to cybersecurity and anti-virus software. To support this attestation, the appendixevaluation documentation has been prepared and is included in the certification filing. This attestation is based on a thorough evaluation of the device's design, functionality, and software environment. The undersigned affirms that the information provided is accurate and complete to the best of their knowledge. Sincerely yours, Applicant Signature Printed Name: Nicky Huang Title: Product Manager Address: Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China Tel.: +86-10-82826362 Email: [email protected] Beijing Viisan Technology Co., Ltd. Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China 2| Page Evaluation regarding to the Covered List Software: Compliance Methodology Evaluation Process Results Device is Inherent compliance ☒ The Chipset(s) used is limited to run the Cybersecurity or anti-virus software. Compliance ☒ The Memory used is limited to run the Cybersecurity or anti-virus software. Compliance ☒ There is storage capacitylimitation for store or install the Cybersecurity or anti-virus software. Compliance ☒ Operatingsystem used is limited to run, install or deliver the Cybersecurity or anti-virus software. Compliance Device is not Inherent compliance □ Evaluation Based on Software Bill of Materials (SBoM) See attached “SBoM“ Note:The SBoM content is limited to the scope of covered list software (e.g. antivirus and cybersecurity software). ☐ Evaluation Based on Scan for Software on the device ☐ Evaluation Based on Filesystem scan ☐ Evaluation Based on Running software check

Beijing Viisan Technology Co., Ltd. Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China 08.13.2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request for: FCC ID: 2A5PQ-AS203 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby requestpermanent confidential treatment of the exhibits accompanying thiscertification application as outlined below :  Block Diagram  Schematics  Operational Description The above exhibits contain trade secrets and/or proprietary information that are not publicly available and materials that the Applicant has spent considerable efforts in developing. Public disclosure of these may be harmful to the Applicant and give an unfair advantage to competitors on the market. Pursuant to DA 04-1705, the applicant also requests temporary confidential treatment of the exhibits outlined below for a period of (up to 180)days from the date of equipment authorization and prior to marketing in the United States to prevent the premature release of any sensitive information. Applicant is aware of their responsibility to notify DERYCOM in the event information regarding the product or the product is made available to the public before the requested period has expired.  User Manual  Internal Photos  External Photos  Test Setup Photos Sincerely, (Signature) Printed Name: Nicky Huang Title: Product Manager Address: Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China Tel.: +86-10-82826362 Email: [email protected]

Beijing Viisan Technology Co., Ltd. Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China (08.13.2025) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization for FCC ID: 2A5PQ-AS203 I, the undersigned, hereby authorize (SHENZHEN TONGCE TESTING LAB) to act on our behalfin all matters relating to this application for equipment certification. Any act carried out by (SHENZHEN TONGCE TESTING LAB) shall have the same effect as our own and I acknowledge that all responsibility for complying with the terms and conditions of certification, as specified by DERYCOM CERTIFICATION SERVICES, INC., still resides with (Beijing Viisan Technology Co., Ltd.). We certify that we are not subject to a denial of federal benefits that includes FCC benefitspursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. §862, and that no partyto the application, as defined in 47 CFR §1.2002(b), is subject to a denial of federal benefits that includes FCC benefits pursuant to that section. Sincerely, (Signature) Name: Nicky Huang Title: Product Manager Tel: +86-10-82826362 Fax: +86-10-82826362 Email: [email protected]

Label Artwork and Location Model: AS203 Label: Size: L*W=31*16 mm Location

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : 2A5PQ-AS203 Test Report No. ............... : TCT250725E032 Date of issue ................... : Aug. 11, 2025 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: 2101 & 2201, Zhenchang Factory, Renshan Industrial Zone, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : Beijing Viisan Technology Co., Ltd. Address ........................... : Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China Manufacturer's name ... : Beijing Mysher Technology Co., Ltd. Address ........................... : Room 106, 1st Floor, Building 1, No. 20 Tongji South Road, Beijing Economic-Technological Development Area, Beijing 100176, China Standard(s) ..................... : KDB 447498 D01 General RF Exposure Guidance v06 Product Name ................. : Wireless Microphone Trade Mark ...................... : Viisan Model/Type reference..... : AS203 Rating(s).......................... : Rechargeable Li-ion Battery DC 3.7V Date of receipt of test item ......................................... : Jul. 25, 2025 Date (s) of performance of test ................................... : Jul. 25, 2025 ~ Aug. 11, 2025 Tested by (+signature) ... : Ronaldo LUO Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT250725E032 Page 2 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 2. General Information ................................................................................. 4 2.1. Test environment and mode ................................................................................. 4 2.2. Description of Support Units ................................................................................ 4 3. Facilities and Accreditations .................................................................. 5 3.1. Facilities ................................................................................................................. 5 3.2. Location ................................................................................................................. 5 4. Test Results and Measurement Data ..................................................... 6 Report No.: TCT250725E032 Page 3 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Product Name ....................... : Wireless Microphone Model/Type reference........... : AS203 Sample Number....................: TCT250725E031-0101 Operation Frequency ........... : 570.0MHz-590.0MHz Modulation Type ................... : pi/4 DQPSK Antenna Type ........................ : Internal Antenna Antenna Gain ........................ : -2.2dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 3.7V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list None. Report No.: TCT250725E032 Page 4 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 2. General Information 2.1. Test environment and mode Item Normal condition Temperature +25ºC Voltage DC 3.7V Humidity 56% Atmospheric Pressure: 1008 mbar Test Mode: Engineering mode: Keep the EUT in continuous transmitting by select channel 2.2. Description of Support Units The EUT has been tested as an independent unit together with other necessary accessories or support units. The following support units or accessories were used to form a representative test configuration during the tests. Equipment Model No. Serial No. FCC ID Trade Name / / / / / Note: 1. All the equipment/cables were placed in the worst-case configuration to maximize the emission during the test. 2. Grounding was established in accordance with the manufacturer’s requirements and conditions for the intended use. 3. For conducted measurements (Output Power, 20dB Occupied Bandwidth, Carrier Frequencies Separation, Hopping Channel Number, Dwell Time, Spurious Emissions), the antenna of EUT is connected to the test equipment via temporary antenna connector, the antenna connector is soldered on the antenna port of EUT, and the temporary antenna connector is listed in the Test Instruments. Report No.: TCT250725E032 Page 5 of 6 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. Facilities and Accreditations 3.1. Facilities The test facility is recognized, certified, or accredited by the following organizations: ● FCC - Registration No.: 645098 SHENZHEN TONGCE TESTING LAB Designation Number: CN1205 The testing lab has been registered and fully described in a report with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. ●A2LA-No.: 4320.01 SHENZHEN TONGCE TESTING LAB The testing lab has been accredited in accordance with the recognized International Standard ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratori…

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Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID. ............................ : 2A5PQ-AS203 Test Report No. ............... : TCT250725E031 Date of issue ................... : Aug. 11, 2025 Testing laboratory .......... : SHENZHEN TONGCE TESTING LAB Testing location/ address: 2101 & 2201, Zhenchang Factory, Renshan Industrial Zone, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, 518103, People's Republic of China Applicant's name ............ : Beijing Viisan Technology Co., Ltd. Address ........................... : Unit A309 third floor, Information Center, Zhongguancun Software Park, Haidian District, Beijing, 100193 China Manufacturer's name ... : Beijing Mysher Technology Co., Ltd. Address ........................... : Room 106, 1st Floor, Building 1, No. 20 Tongji South Road, Beijing Economic-Technological Development Area, Beijing 100176, China Standard(s) ..................... : FCC CFR Title 47 Part 15 Subpart C Section 15.236 Product Name ................. : Wireless Microphone Trade Mark ...................... : Viisan Model/Type reference..... : AS203 Rating(s).......................... : Rechargeable Li-ion Battery DC 3.7V Date of receipt of test item ......................................... : Jul. 25, 2025 Date (s) of performance of test ................................... : Jul. 25, 2025 ~ Aug. 11, 2025 Tested by (+signature) ... : Ronaldo LUO Check by (+signature) .... : Beryl ZHAO Approved by (+signature): Tomsin General disclaimer: This report shall not be reproduced except in full, without the written approval of SHENZHEN TONGCE TESTING LAB. This document may be altered or revised by SHENZHEN TONGCE TESTING LAB personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT250725E031 Page 2 of 29 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Table of Contents 1. General Product Information .................................................................. 3 1.1. EUT description ..................................................................................................... 3 1.2. Model(s) list ............................................................................................................ 3 1.3. Operation Frequency ............................................................................................ 3 2. General Information ................................................................................. 4 2.1. Test environment and mode ................................................................................. 4 2.2. Description of Support Units ................................................................................ 4 3. Facilities and Accreditations .................................................................. 5 3.1. Facilities ................................................................................................................. 5 3.2. Location ................................................................................................................. 5 3.3. Measurement Uncertainty ..................................................................................... 5 4. Test Results and Measurement Data ..................................................... 6 4.1. Antenna requirement ............................................................................................ 6 4.2. Conducted Emission ............................................................................................. 7 4.3. Maximum Radiated Output Power ..................................................................... 11 4.4. Occupied Bandwidth ........................................................................................... 13 4.5. Necessary Bandwidth Spurious Emissions ...................................................... 16 4.6. Radiated Spurious Emission Measurement ...................................................... 19 4.7. Frequency Stability Measurement ..................................................................... 26 Appendix A: Photographs of Test Setup Appendix B: Photographs of EUT Report No.: TCT250725E031 Page 3 of 29 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. General Product Information 1.1. EUT description Product Name ....................... : Wireless Microphone Model/Type reference........... : AS203 Sample Number....................: TCT250725E031-0101 Operation Frequency ........... : 570.0MHz-590.0MHz Modulation Technology ....... : pi/4 DQPSK Antenna Type ........................ : Internal Antenna Antenna Gain ........................ : -2.2dBi Rating(s)................................ : Rechargeable Li-ion Battery DC 3.7V Note: The antenna gain listed in this report is provided by applicant, and the test laboratory is not responsible for this parameter. 1.2. Model(s) list None. 1.3. Operation Frequency 570.0MHz-590.0MHz Channel Frequency Channel Frequency Channel Frequency Channel Frequency 1 570.0MHz 11 575.0MHz 21 581.5MHz 31 586.5MHz 2 570.5MHz 12 575.5MHz 22 582.0MHz 32 587.0MHz 3 571.0MHz 13 577.5MHz 23 582.5MHz 33 587.5MHz 4 571.5MHz 14 578.0MHz 24 583.0MHz 34 588.0MHz 5 572.0MHz 15 578.5MHz 25 583.5MHz 35 588.5MHz 6 572.5MHz 16 579.0MHz 26 584.0MHz 36 589.0MHz 7 573.0MHz 17 579.5MHz 27 584.5MHz 37 589.5MHz 8 573.5MHz 18 580.0MHz 28 585.0MHz 38 590.0MHz 9 574.0MHz 19 580.5MHz 29 585.5MHz 10 574.5MHz 20 581.0MHz 30 586.0MHz Remark: Channel 1, 18 & 38 have been tested for pi/4 DQPSK modulation mode. Report No.: TCT250725E031 Page 4 of 29 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 2. General Information 2.1. Test environment and mode Operating Environment: Condition Conducted Emission Radiated Emission Temperature: 24.7 C 25.7 C Humidity: 52 % RH 51 % RH Atmospheric Pressure: 1010 mbar 1010 mb…

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