2BVC8-U37Bmicrophone

3, Interface Function Charging reminder Power (D Microphone light1� @Battery Holder Microphone light2@ @ Charging part (D Power:Long press to turn on,activate the microphone power, and then long press again lo turn off. �@Microphone connection light:The microphone indicator lights up when connected and flashes when not connected. @Charging reminder:When charging the red light is on;when fully charged the red light goes out. @ Battery Holder: Open the battery compartment correctly insert the 14500 ballery,and then close the compartment cover to complete the battery insertion. @ Charging part: TYPEC Charging part DC 5V/1A (!) 6.35Audio head It has an interface a 6.35 audio socket. Once turned on and the microphone is activated ,it can be used. 4 $ 4, Specification Name: Wireless microphone Bandwidth: 2MHz Sensitivity: -85dBm Frequency: 2402-2480MHz SNR: ►92dB Reference input: DC5V/1A Wireless microphone Main Singing karaoke Function: Two-microphone duet Supply current:Type-C USB 5V Operation Charging time:3-4 hours Parameter: Utility time:7-8 hours The above data were obtained through production testing.However, there may be slight discrepancies in actual usage due to differences in the objective environment and tool factors. $ 5, Product Display and 0 I 1iili l.J Wireless Mirophones*2 Ill · --1 H User Manual*1 Anti-slip Rings•2 6 Receiver*1 Type-C USB cabIe•1 Adapter•1

1/1 USAgentforServiceofProcessLETTEROFATTESTATION TO: OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USAgentforServiceofProcess: Companyname:HOPEKCORPORATIONINC FRN:0034562900 ContactName:YangyangXu Address:16755CoyoteBushDrUnit84,SanDiego,CA92127UnitedStates TelephoneNo:561-875-9826 Email:[email protected] Applicant: Companyname:Jin&ChengTechnologyCo.,Ltd. GranteeCode:2BVC8 FCCID:2BVC8-U37B FRN:0038197935 ContactName:QinLin Address:No.97,XihuRoad,ShaqiaoCommunity,HumenTown,DongguanCity, GuangdongProvince,China TelephoneNo:13410574900 FaxNo:/ Email:[email protected] Jin&ChengTechnologyCo.,Ltd.certifiesthat,asofthedateofthisfilingoftheapplication withtheTCB,[HOPEKCORPORATIONINC]isourdesignatedUSagentforserviceofprocess fortheabovereferencedFCCID.Jin&ChengTechnologyCo.,Ltd.acceptstomaintainan agentfornolessthanoneyearafterthegranteehasterminatedallmarketingandimportation ortheconclusionofanycommissionrelatedproceedinginvolvingequipment.[HOPEK CORPORATIONINC]accepts,asofthedateofthefilingoftheapplication,theobligationofthe designatedUSagentforserviceofprocessfortheabovereferenceFCCID. TheUSAgentforServiceofProcessisawareofandagreestocomplywiththerequirements outlinedintheFCCEquipmentAuthorizationProgram,ReportandOrderFCC22-84,and clause§2.911. TheApplicantisawareofandagreestocomplywiththerequirementsoutlinedintheFCC EquipmentAuthorizationProgram,ReportandOrderFCC22-84,andclause§2.911. Date:2026-03-24 Applicant’sName:QinLinUSAgent’sName:YangyangXu Title:EngineeringTitle:Manager Signature:Signature:

Jin & Cheng Technology Co., Ltd. March 24, 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: 2BVC8-U37B [Jin & Cheng 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, Qin Lin Jin & Cheng Technology Co., Ltd. March 24, 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: 2BVC8-U37B [Jin & Cheng 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, Qin Lin

Jin & Cheng Technology Co., Ltd. 3/24/2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR Product Name: microphone FCC ID: 2BVC8-U37B Model(s): U37B To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the (Schematic Diagram, Block Diagram, Operational Description) required to be submitted with this application be permanently withheld from public review. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market Please contact me if there is any information you may need. Sincerely, Signature: March 24, 2026 Name Qin Lin Position Engineering Company Name Jin & Cheng Technology Co., Ltd. Address No. 97, Xihu Road, Shaqiao Community, Humen Town, Dongguan City, Guangdong Province Tel 13410574900 Fax / Email [email protected]

Jin & Cheng Technology Co., Ltd. 3/24/2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen PSI Testing Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). This agreement expires one year from the current date. Sincerely, Signature: March 24, 2026 Name Qin Lin Position Engineering Company Name Jin & Cheng Technology Co., Ltd. Address No. 97, Xihu Road, Shaqiao Community, Humen Town, Dongguan City, Guangdong Province Tel 13410574900 Fax / Email [email protected]

Page 1 of 4 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix II external photos FCC ID: 2BVC8-U37B Page 2 of 4 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 3 of 4 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 4 of 4 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China ------End------

Label and Location Material: Silk-screen Font color: White Size: L: 4cm*W: 1cm Label and Location W FCC ID: 2BVC8-U37B Model No.: U37B L

Page 1 of 6 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix III internal photos FCC ID: 2BVC8-U37B Page 2 of 6 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 3 of 6 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 4 of 6 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China TX ANT Page 5 of 6 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Page 6 of 6 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China ------End------

Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China RF Exposure evaluation FCC ID: 2BVC8-U37B According to 447498 D01 General RF Exposure Guidance v06 The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison According to FCC Part 2.1093, this device is classified as a Portable Device. A portable device is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. 2.4G SRD: Worse case output power is as below: [2402MHz: 0.80dBm] Maximum output power is 0.80dBm (1.20 mW). (1.20 mW /5mm)·[√2.480(GHz)]= 0.38 <3.0 for 1-g SAR. Then SAR evaluation is not required.

Inverted F Antenna Specification Summary ITEMANT SPEC Model Name 2.4G ANT HorizontalVertical 2400MHz 2400MHz2500MHz2400MHz2400MHz 2500MHz Center Frequency -1.26-0.76-0.58-5.25-2.46-1.86 MAX. Gain -0.58dBi PolarizationHorizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance50 Ohm Antenna Length 38.20mm Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm) Horizontal: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -40 Scale: 5/div Gain(dBi) Frequency (MHz) MaxMinAvg 2400-1.26174-30.0801-7.18716 2450-0.765802-36.5604-7.48023 2500-0.585582-22.0315-6.59127 Vertical: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Gain(dBi) Frequency (MHz) MaxMinAvg 2400-5.2537-22.1424-12.4294 2450-2.4652-24.5837-10.4702 2500-1.86120-29.5214-9.20432 ANT Test Labs：Attestation of Global Compliance Co., Ltd.

Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Page 1 of 42 Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China FCC TEST REPORT FCC ID: 2BVC8-U37B On Behalf of Jin & Cheng Technology Co., Ltd. microphone Model No.: U37B Prepared for : Jin & Cheng Technology Co., Ltd. Address : No. 97, Xihu Road, Shaqiao Community, Humen Town, Dongguan City, Guangdong Province Prepared By : Shenzhen PSI Testing Co., Ltd. Address : 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Report Number : psi2601192-C01-R08 Date of Receipt : February 2, 2026 Date of Test : February 3, 2026 –February 12, 2026 Date of Report : February 12, 2026 Version Number : V0 Page 2 of 42 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China TABLE OF CONTENTS Description Page 1. Summary Of Standards And Results ------------------------------------------------------------- 6 1.1. Description of Standards and Results ------------------------------------------------------- 6 2. General Information ------------------------------------------------------------------------------------ 7 2.1. Description of Device (EUT) ------------------------------------------------------------------- 7 2.2. Accessories of Device (EUT) ------------------------------------------------------------------ 8 2.3. Tested Supporting System Details------------------------------------------------------------ 8 2.4. Block Diagram of Connection Between EUT and Simulators ------------------------- 8 2.5. Test Mode Description --------------------------------------------------------------------------- 9 2.6. Software test version and power setting information ------------------------------------ 9 2.7. Test Conditions ---------------------------------------------------------------------------------- 10 2.8. Test Facility --------------------------------------------------------------------------------------- 10 2.9. Measurement Uncertainty -------------------------------------------------------------------- 10 2.10. Test Equipment List----------------------------------------------------------------------------- 11 3. Spurious Emission ------------------------------------------------------------------------------------ 12 3.1. Test Limits ----------------------------------------------------------------------------------------- 12 3.2. Block Diagram of Test setup ----------------------------------------------------------------- 13 3.3. Test Procedure ----------------------------------------------------------------------------------- 14 3.4. Test Results--------------------------------------------------------------------------------------- 15 4. Power Line Conducted Emission ---------------------------------------------------------------- 20 4.1. Test Limits ----------------------------------------------------------------------------------------- 20 4.2. Test Procedure ----------------------------------------------------------------------------------- 20 4.3. Test Setup ----------------------------------------------------------------------------------------- 20 4.4. Test Results--------------------------------------------------------------------------------------- 21 5. Out-of-band Emissions ------------------------------------------------------------------------------ 24 5.1. Test Limits ----------------------------------------------------------------------------------------- 24 5.2. Test Procedure ----------------------------------------------------------------------------------- 24 5.3. Test Setup ----------------------------------------------------------------------------------------- 24 5.4. Test Results--------------------------------------------------------------------------------------- 24 6. Conducted Maximum Output Power ------------------------------------------------------------ 30 6.1. Test limits ------------------------------------------------------------------------------------------ 30 6.2. Test Procedure ----------------------------------------------------------------------------------- 30 6.3. Test Setup ----------------------------------------------------------------------------------------- 30 6.4. Test Results--------------------------------------------------------------------------------------- 30 7. Peak Power Spectral Density --------------------------------------------------------------------- 31 7.1. Test limits ------------------------------------------------------------------------------------------ 31 7.2. Test Procedure ----------------------------------------------------------------------------------- 31 7.3. Test Setup ----------------------------------------------------------------------------------------- 31 7.4. Test Results--------------------------------------------------------------------------------------- 31 8. Occupied Bandwidth --------------------------------------------------------------------------------- 34 8.1. Test limits ------------------------------------------------------------------------------------------ 34 8.2. Test Procedure ----------------------------------------------------------------------------------- 34 8.3. Test Setup ----------------------------------------------------------------------------------------- 34 8.4. Test Results--------------------------------------------------------------------------------------- 34 Page 3 of 42 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an Dis…

Text truncated - open the document above for the full version.

Page 1 of 2 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Appendix I Test Setup Photo FCC ID: 2BVC8-U37B Spurious Radiation Emissions Test (<1G) Spurious Radiation Emissions Test (＞1G) Page 2 of 2 Report No.: psi2601192-C01-R08 Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Add: 1-2/F., Building 5, Yudafu Industrial Park, No.10, Xingye West Road, Shajing Subdistrict, Bao'an District, Shenzhen, Guangdong, China Conducted emission Test ------End------