2BEMR-870FBluetooth receiver

FCC warning statements: 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. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. 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. The device has been evaluated to meet general RF exposure requirement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

1/1 US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company name: HOPEK CORPORATION INC FRN: 0034562900 Contact Name: Peter Davis Address: 16755 Coyote Bush Dr Unit 84, San Diego, CA 92127 United States Telephone No: 561-235-6113 Email: [email protected] Applicant: Company name: Shenzhen Baiyin Technology Co., LTD Grantee Code: 2BEMR FCC ID: 2BEMR-870F FRN: 0034769299 Contact Name: Weibin Tang Address: 8th Floor, No 2 Building, Baoyunda Logistics Center, Bao'an District, Shenzhen, China Telephone No: 19270311927 Fax No: / Email: [email protected] Shenzhen Baiyin Technology Co., LTD certifies that, as of the date of this filing of the application with the TCB, [HOPEK CORPORATION INC] is our designated US agent for service of process for the above referenced FCC ID. Shenzhen Baiyin Technology Co., LTD accepts to 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 equipment. [HOPEK CORPORATION INC] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Date: 2026-01-13 Applicant’s Name: Weibin Tang US Agent’s Name: Peter Davis Title: General Manager Title: Manager Signature: Signature:

Shenzhen Baiyin Technology Co., LTD January 13, 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: 2BEMR-870F [Shenzhen Baiyin 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, Weibin Tang Shenzhen Baiyin Technology Co., LTD January 13, 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: 2BEMR-870F [Shenzhen Baiyin 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, Weibin Tang

Shenzhen Baiyin Technology Co., LTD 1/13/2026 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR Product Name: Bluetooth receiver FCC ID: 2BEMR-870F Model(s): 870F 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: January 13, 2026 Name Weibin Tang Position General Manager Company Name Shenzhen Baiyin Technology Co., LTD Address 8th Floor, No 2 Building, Baoyunda Logistics Center, Bao'an District, Shenzhen, China Tel 19270311927 Fax / Email [email protected]

Shenzhen Baiyin Technology Co., LTD 1/13/2026 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: January 13, 2026 Name Weibin Tang Position General Manager Company Name Shenzhen Baiyin Technology Co., LTD Address 8th Floor, No 2 Building, Baoyunda Logistics Center, Bao'an District, Shenzhen, China Tel 19270311927 Fax / Email [email protected]

Page 1 of 4 Report No.: psi2512216-C01-R12 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: 2BEMR-870F Page 2 of 4 Report No.: psi2512216-C01-R12 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.: psi2512216-C01-R12 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.: psi2512216-C01-R12 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: 1cm*W: 0.4cm Label and Location W FCC ID: 2BEMR-870F Model No.: 870F L

Page 1 of 4 Report No.: psi2512216-C01-R12 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: 2BEMR-870F Page 2 of 4 Report No.: psi2512216-C01-R12 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.: psi2512216-C01-R12 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.: psi2512216-C01-R12 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------ ANT BT

Page 1 of 2 Report No.: psi2512216-C01-R12 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 IV MPE FCC ID: 2BEMR-870F Prediction of MPE at a given distance 1. Limits The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b) KDB Test Methodology: KDB 447498 D01 v06. 2. Test Procedure Equation from page 18 of OET Bulletin 65, Edition 97-01 Where: S = power density P = power input to the antenna G = numeric gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to the centre of radiation of the antenna Page 2 of 2 Report No.: psi2512216-C01-R12 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 3. Result Mode Frequency (MHz) Prediction distance (cm) RF output power(Max) (dBm) Tune-up power (Max) MPE (mW/cm 2 ) Limit (mW/cm 2 ) SAR Test Exclusion dBm mW BT EDR 2402-2480 20 2.75 3 1.9953 0.0007 1 Yes BT Antenna: max gain 2.499dBi, 1.78(numeric) Therefore this device complies with FCC's RF radiation exposure limits for general population without SAR evaluation.

Test report on onboard PIFA antennas for the 2.4G-2.48G frequency band. SPECIFICATIONS Frequency（MHz ）2400-2480 Peak Gain （dBi ）2.499 AverageGain （dBi ）＞-4 VSWR＜3.2 Impedance（Ω）50 Ω AntennaTypePlannarInvertedF Antennaon board PolarizationLinear Test Environment: Zhongke Guojitu Laboratory Testing System Z X Y Physical appearance and physical dimensions of the antenna. Passive antenna S-parameters: Standing wave ratio (VSWR), return loss, and Smith chart. Antenna efficiency and gain Frequency（MHz ）Gain （dBi ）Effciency（%）AverageGain（dBi ）Efficiency（dB ） 2400 1.43359.329%-2.717-2.267 24100.92751.861%-3.416-2.852 24200.82952.112%-3.166-2.831 2430 0.88149.299%-3.258-3.072 24401.19250.672%-3.144-2.952 24501.68853.067%-2.735-2.752 2460 2.19459.423%-2.276-2.260 24702.11856.680%-2.438-2.466 24802.49961.727%-2.112-2.095 Average 1.52954.908%-2.806-2.616 Peak2.49961.727%-2.112-2.095 Antenna 2440MHz 2D-Theta Pattern Antenna 2440MHz 2D-Phi Pattern Antenna 2440MHz 3D-Horizontal Pattern Antenna 2440MHz 3D-Vertical Pattern 2440MHz3D-TotalPattern

Shenzhen PSI Testing Co., Ltd. Tel: 0755-23011775 | E-mail: [email protected] | http://www.psi-lab.com Page 1 of 89 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: 2BEMR-870F On Behalf of Shenzhen Baiyin Technology Co., LTD Bluetooth receiver Model No.: 870F Prepared for : Shenzhen Baiyin Technology Co., LTD Address : 8th Floor, No 2 Building, Baoyunda Logistics Center, Bao'an District, Shenzhen, China 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 : psi2512216-C01-R12 Date of Receipt : December 26, 2025 Date of Test : December 26, 2025–January 8, 2026 Date of Report : January 8, 2026 Version Number : V0 Page 2 of 89 Report No.: psi2512216-C01-R12 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. Maximum Peak Output Power ..................................................................................................... 12 3.1. Limit ....................................................................................................................................... 12 3.2. Test Procedure ...................................................................................................................... 12 3.3. Test Setup .............................................................................................................................. 12 3.4. Test Result ............................................................................................................................. 12 4. Bandwidth ..................................................................................................................................... 18 4.1. Limit ....................................................................................................................................... 18 4.2. Test Procedure ...................................................................................................................... 18 4.3. Test Setup .............................................................................................................................. 19 4.4. Test Result ............................................................................................................................. 19 5. Carrier Frequency Separation ..................................................................................................... 29 5.1. Limit ....................................................................................................................................... 29 5.2. Test Procedure ...................................................................................................................... 29 5.3. Test Setup .............................................................................................................................. 29 5.4. Test Result ............................................................................................................................. 30 6. Number Of Hopping Channel ...................................................................................................... 32 6.1. Limit ....................................................................................................................................... 32 6.2. Test Procedure ...................................................................................................................... 32 6.3. Test Setup .............................................................................................................................. 32 6.4. Test Result ............................................................................................................................. 33 7. Dwell Time ..................................................................................................................................... 35 7.1. Te…

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Page 1 of 2 Report No.: psi2512216-C01-R12 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: 2BEMR-870F Spurious Radiation Emissions Test (<1G) Spurious Radiation Emissions Test (＞1G) Page 2 of 2 Report No.: psi2512216-C01-R12 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------