2A3OORB37Two Way Radio

RB37 Bluetooth Two Way Radio USER’S MANUAL ( US ) 1 Bluetooth earphone Basic Operations and Function Description Power ON / OFF Rotate Volume Switch clockwise until a “Click” sound is heard, that means radio power is on. Rotate Volume Switch anti-clockwise until a “Click” sound is heard, that means radio power is off. Communication Press PTT key to transmit, the indicator turns red, talk to the microphone at the moment, the other side will hear your speaking message. Release PTT key after finishing transmitting and start to receive the other side speaking message, when receiving the other side message the indicator light is green at the same time. Volume Increase / Decrease Rotate Volume Switch clockwise to increase the volume, rotate Volume Switch anti-clockwise to decrease the volume. Channel Adjustment Press PF1 / Channel Increase key, channel will increase in turns, press PF2 / Channel Decrease key, channel will decrease in turns. Low Battery Voltage Warning When you hear a sound “Please charge battery” while the indicator is flashing red light, it means battery voltage is lower than working voltage, please charging radio. Monitor Press the Identify key which stores Monitor function for 2 seconds, Monitor function start. Release the key to turn off the Monitor function. Flashlight Starts Press the Identify key which stores Flashlight function for 2 seconds, Flashlight function is on, and repeat this operation to turn off flashlight. Alarm Function Starts Press the Identify key which stores Alarm function for 2 seconds, Alarm function is starts, and press the PTT key to turn off. VOX ON Keep pressing PF1/PF2 the side key function definition key which stores VOX function for 2 second to turn on the VOX. Repeat operation to adjust the VOX function level. The higher the level, the smaller the voice of the voice activation, and turn off the VOX with a “Beep”. VOX Delay Function Keep pressing PF1/PF2 the side key function definition key which stores VOX delay function for 2 second to turn on the VOX delay. Repeat operation to adjust the VOX delay time. The higher the level,the longer the delay time, and turn off the VOX with a “Beep”. Key Locks Press the Identify key which stores Channel-Lock function for 2 seconds, the radio will give a “Beep” sound to indicator that Channel-Lock function starts, and channel adjustment is unavailable now. Repeat this operation to turn off channel lock function. Scan Starts Press the Identify key which stores Scan function for 2 second, scan function is on, and repeat this operation to turn off scan. Wireless copy 1.Press (no loose) the PF2 key of the receiver radio,and meanwhile turn on the radio which will accept data, it must keep press the PF2 key for 1 second,When see the green light flashing and hear "Beep" 3 times, the radio go into wireless copy receiving mode 2.Then press (no loose) the PF1 key of and meanwhile turn on the other radio which is going to transmit data,and must press the PF2 key for 1 seconds,When see the red light flashing and hear "Beep" 3 times, the radio go into wireless copy replication mode. 2 • Press the PTT key of the transmitter, and the red light flashes to transmit data. Restart the walkie talkie and the radio will automatically exit the mode. • The red light and green light of the receiver flashes crosswise to indicate that the data is being received at this time, and the power will restart after the radio receives the data. Note:The wireless copy frequency and ID code of the transmitter and receiver must be the same to transmit data. The wireless copy frequency and ID code can be changed by programming software. Read-Write Frequency Encryption Use write frequency software Settings. CTCSS/DCS User can set CTCSS/DCS signaling on the transceiver channel by software. Only when receiving same CTCSS/DCS signaling from other transceiver, the squelch will open. If same channels but with different CTCSS/DCS signaling for calling, then squelch will not open, only green light is on. CTCSS/DCS codes are listed below: Bluetooth on/off button Press and hold the PF1/PF2 side key buttons that have defined the Bluetooth on/off button for 2 seconds to turn on, again to turn off the Bluetooth. Press and hold the Bluetooth on/off button, walkie talkie will enter into the Bluetooth mode after a beep and at the same time, the white light will flash quickly The white light flashes slowly when the Bluetooth connection successful Bluetooth Headset After the Bluetooth headset and the walkie talkies are successfully connected, there will have a beep then enter into the receiving state. When Bluetooth Handset hears 3 beeps, then can talk. Press 1 time, the radio will transmit, press again radio will stop transmitting Press and hold, the radio will transmit, release it, the radio will stop transmitting 3 Headphone charging interface/ Auxiliary headphone interface LED indicator Power switch Volume adjustment Knob Press it to let walkie-talkie transmit, then press again to stop transmitting. Press and hold the walkie-talkie to transmit, release the walkie-talkie to stop transmitting. CTCSS (50 Numbers) Technical Specifications Frequency Range Memory Channel Audio Distortion Frequency Stability Maximum Frequency Deviation Remanent Radiation Modulation Mode Reference Sensitivity Noise-free Sensitivity Adjacent Channel Selectivity Spurious Response Rejection Inter-Modulation Electric Current Operating Voltage Operating Temperature FRS 22 5% ±2.5ppm ≤5KHz/≤2.5KHz ≤7uW 1 6KφF3E/ 11KφF3E ≤0.25uV/≤0.3uV ≤0.2uV/≤0.25uV ≥65dB ≥55dB ≥60dB ≤1.3A 3.7V DC -10°C～+50°C 4 Serial number Frequency Sub audio Power 1 4625625 67.0 2W 2 462.5875 118.8 2W 3 462.6125 127.3 2W 4 462.6375 131.8 2W 5 462.6625 136.5 2W 6 462.6875 141.3 2W 7 462.7125 146.2 2W 8 467.5625 D243N 0.5W 9 467.5875 D032N 0.5W 10 467.6125 D047N 0.5W 11 467.6375 D051N 0.5W 12 467.6625 D053N 0.5W 13 467.6875 D065N 0.5W 14 467.7125 D116N 0.5W 15 462.5500 123.0 2W 16 462.5750 D7431 2W 17 462.6000 D3321 2W 18…

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Shenzhen Ysair Technology Co., LTD Room 403, 4th Floor, Building 4, Yunli intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date:2025-10-22 Ref: Attestation Statements, US agent designation FCC ID: 2A3OORB37 FRN：0031641426 Shenzhen Ysair Technology Co., LTD acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment above for which authorization is sought. Contact: Liuye Li Company U.S. agent: RETEVIS INC Physical U.S. address of agent: 1733 E BROOKPORT ST,COVINA,CA 91724,United States FRN of U.S. agent: 0033657701 Email address of U.S. agent: [email protected] Phone of U.S. agent: 626-362-2594 RETEVIS INC acknowledges their obligation to accept service of process on behalf of Shenzhen Ysair Technology Co., LTD Shenzhen Ysair Technology Co., LTD accepts its obligation to maintain an agent for 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. This acceptance will be in effect till the applicant decides to change the agent of service of process. By signing this form, we confirm the above and that we are aware of the application requirements listed under §2.911(d)(7). Sincerely, Signature Signature Name: Dongfang Shen Name: Liuye LI Titel: Manager Title: Directing Manager Shenzhen Ysair Technology Co., LTD RETEVIS INC

Shenzhen Ysair Technology Co., LTD Room 403, 4th Floor, Building 4, Yunli intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Letter of Authorization Company: Shenzhen Ysair Technology Co., LTD Address: Room 403, 4th Floor, Building 4, Yunli intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Product Name: Two Way Radio Model Number(s): RB37 Product Description: Two Way Radio We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: Nov. 10, 2025 Name: Dongfang Shen Title: General Manager Company: Shenzhen Ysair Technology Co., LTD

Shenzhen Ysair Technology Co., LTD Room 403, 4th Floor, Building 4, Yunli Intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Attestation Statements Not Covered Entity Applicant & Not Covered Equipment To: Federal Communications Commission Date: November 10, 2025 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Information Required by Section 2.911(d)(5)(i) & (ii) FCC ID: 2A3OORB37 Shenzhen Ysair 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 § 2.903 of the FCC rules. Sincerely yours, Name: Dongfang Shen Title: General Manager

Shenzhen Ysair Technology Co., LTD Room 403, 4th Floor, Building 4, Yunli Intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Attestation Statements Not Covered Entity Applicant & Not Covered Equipment To: Federal Communications Commission Date: November 10, 2025 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Information Required by Section 2.911(d)(5)(i) & (ii) FCC ID: 2A3OORB37 Shenzhen Ysair 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 § 2.903 of the FCC rules. Sincerely yours, Name: Dongfang Shen Title: General Manager

Shenzhen Ysair Technology Co., LTD Room 403, 4th Floor, Building 4, Yunli Intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2025-11-20 Subject; Request for Confidentiality FCC ID: 2A3OORB37 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. 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. Schematic Diagram Block Diagram Operational Description Parts List Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Dongfang Shen Title: General Manager

Report No.: AGC00319250802AP02 Page 1 of 5 EXTERNAL PHOTOS All View of EUT Top View of EUT Report No.: AGC00319250802AP02 Page 2 of 5 Bottom View of EUT Front View of EUT Report No.: AGC00319250802AP02 Page 3 of 5 Back View of EUT Left View of EUT Report No.: AGC00319250802AP02 Page 4 of 5 Right View of EUT Port-1 View of EUT Report No.: AGC00319250802AP02 Page 5 of 5 Charger View of EUT ****************************************End of Report*************************************

FCC ID Label Location 30mm*40mm FCC ID: 2A3OORB37

Report No.: AGC00319250802AP02 Page 1 of 8 INTERNAL PHOTOS Open View-1 of EUT Open View-2 of EUT Report No.: AGC00319250802AP02 Page 2 of 8 Internal View-1 of EUT Internal View-2 of EUT Report No.: AGC00319250802AP02 Page 3 of 8 Internal View-3 of EUT Internal View-4 of EUT UHF Antenna Report No.: AGC00319250802AP02 Page 4 of 8 Internal View-5 of EUT Internal View-6 of EUT Report No.: AGC00319250802AP02 Page 5 of 8 Internal View-7 of EUT Internal View-8 of EUT Report No.: AGC00319250802AP02 Page 6 of 8 Internal View-9 of EUT Internal View-10 of EUT Report No.: AGC00319250802AP02 Page 7 of 8 Internal View-11 of EUT Internal View-12 of EUT BT Antenna Report No.: AGC00319250802AP02 Page 8 of 8 Battery View of EU ****************************************End of Report*************************************

Page 1 of 22 FCC Test Report Report No.: AGC00319250802FE01 FCC ID : 2A3OORB37 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Two Way Radio BRAND NAME : RETEVIS MODEL NAME : RB37 APPLICANT : Shenzhen Ysair Technology Co., LTD DATE OF ISSUE : Oct. 19, 2025 STANDARD(S) : FCC Part 15 Subpart B REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC00319250802FE01 Page 2 of 22 Report Revise Record Report Version Revise Time Issued Date Valid Version Notes V1.0 / Oct. 19, 2025 Valid Initial Release Report No.: AGC00319250802FE01 Page 3 of 22 Table of Contents 1. General Information ........................................................................................................................................ 4 2. Product Information ........................................................................................................................................ 5 2.1 Product Technical Description ................................................................................................................... 5 2.2 Auxiliary Surrounding Description ............................................................................................................. 5 2.2 Test Methodology ...................................................................................................................................... 6 2.3 Description of Test Modes ......................................................................................................................... 6 3. Test Environment ............................................................................................................................................ 7 3.1 Address of The Test Laboratory ................................................................................................................ 7 3.2 Test Facility ................................................................................................................................................ 7 3.3 Environmental Conditions ......................................................................................................................... 8 3.4 Measurement Uncertainty ......................................................................................................................... 8 3.5 List of Equipment Used ............................................................................................................................. 9 4. Summary of Test Results ............................................................................................................................. 10 5. Radiated Emission Measurements .............................................................................................................. 11 5.1 Provisions Applicable .............................................................................................................................. 11 5.2 Measurement Setup ................................................................................................................................ 11 5.3 Measurement Procedure ......................................................................................................................... 12 5.4 Measurement Resul ................................................................................................................................ 13 6. Conducted Emission Measurements .......................................................................................................... 17 6.1 Provisions Applicable .............................................................................................................................. 17 6.2 Measurement Setup ................................................................................................................................ 17 6.3 Measurement Procedure ......................................................................................................................... 18 6.4 Measurement Result ............................................................................................................................... 19 Appendix I: Photographs of Test Setup .......................................................................................................... 21 Appendix II: Photographs of Test EUT ........................................................................................................... 21 Report No.: AGC00319250802FE01 Page 4 of 22 1. General Information Applicant Shenzhen Ysair Technology Co., LTD Address Room 403, 4th Floor, Building 4, Yunli intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Manufacturer Shenzhen Ysair Technology Co., LTD Address Room 403, 4th Floor, Building 4, Yunli intelligent Park, No. 3 Changfa Middle Road, Yangmei Community, Bantian Street, Longgang District, Shenzhen, China Factory N/A Address N/A Product Designation Two Way Radio Brand Name RETEVIS Test Model RB37 Series Model(s) N/A Difference Description N/A Date of receipt of test item Aug. 27, 2025 Date of Test Aug. 27, 2025~Oct. 11, 2025 Deviation from Standard No any deviation from the test method Condition of Test Sample Normal Test Result Pass Test Report Form No AGCTR-ER-FCC-CSR-V1.0 Note: The test results of this report relate only to the tested sample identified in this report. Prepared By Bibo Zhang (Project Engineer) Oct. 19, 2025 Reviewed By Jack Gui (Reviewer) Oct. 19, 2025 Approved By Angela Li (Authorized Officer) Oct. 19, 2025 Report No.: AGC00319250802FE01 Page 5 of 22 2. Product Information 2.1 Product Technical Description Housing Type Plastic and metal Receive Frequency Range 462.5625 - 462.7125MHz, 467.5625 - 467.7125MHz 462.5500 - 462.7250MHz Equipment Type Table-Top Hardware Version V1.2 Software Version V1_03_02_03_20250703 Power Supply DC 3.7V 2000mAh by battery or DC 5V from charger I/O Port Information (Applicable Not Applicabl…

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Report No.: AGC00319250802AP03 Page 1 of 2 TEST SETUP PHOTOS Radiated Emission Test Setup Below 1GHz Radiated Emission Test Setup Above 1GHz Report No.: AGC00319250802AP03 Page 2 of 2 AC Power Line Conducted Test Setup ****************************************End of Report*************************************

Report No.: AGC00319250802AP01 Page 1 of 3 TEST SETUP PHOTOS RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC00319250802AP01 Page 2 of 3 AC POWER LINE CONDUCTED TEST SETUP BT CONDUCTED TEST SETUP Report No.: AGC00319250802AP01 Page 3 of 3 FRS CONDUCTED TEST SETUP ****************************************End of Report*************************************