2ASNSRT21HTWO WAY RADIO

RT21H USER’S MANUAL Contents Warnings 01 Get Familiar with The Device Basic Operations Facto Frequencies CAUTION 02 02 05 06 12 Guarantee For downloading fuher resources: Brochures, Software/Firmware, Manual etc, Please contact your direct reseller rst OR go to website retevis.com and check “suppo”in the each product link to download it. Warnings Before using this radio, please read this manual carefully. Do not charge the radio in ammable, explosive, or radio-restricted areas (e.g., gas stations, airpos). Do not operate this radio without authorization in areas restricted by government regulations. Keep the radio away from direct sunlight and heat sources. Avoid exposing the radio to dust, moisture, or splashing water. If you notice smoke or an unusual odor, immediately remove the batte pack and contact your dealer. Repairs must be carried out by qualied technicians. Do not disassemble the radio. Charging Notes： ● Use only the supplied charger for this model. ● Turn o the radio before charging. ● For best peormance, charge the batte at least 5 hours before rst use. ● Do not charge for more than 12 hours continuously; overcharging shoens batte life. If charging time exceeds 12 hours without a full charge, disconnect immediately. ● This charger is only for the specied batte pack. Do not charge other batteries. ● Store fully charged batteries in a cool, d place. Keep away from re or direct sunlight. ● Do not transmit while charging. ● Slight heating of the batte during charging is normal. 1 Get Familiar with The Device 2 1. Antenna 2. Speaker 3. Microphone 4. Channel Knob 5. Power/Volume Knob 6. Status Indicator 7. Hidden Display 8. PTT 9. Side Key 10. Batte 11. Audio/Data Po 12. Type-C Po 1 2 3 4 5 6 7 8 9 10 11 12 Basic Operations 1. Status Indicator Red light for transmit, green light for receive. 2. Channel Knob Rotate the knob clockwise to increase or counterclockwise to decrease the channel. A total of 16 channels are available. 3. Power/Volume Knob Rotate the knob clockwise to turn on the radio and adjust the audio level. Rotate counterclockwise until a click is heard to power o. 3 4. PTT Hold down the PTT button and speak into the microphone to transmit; the red indicator will light up. If the channel has no transmit frequency, a warning tone will sound. Release the PTT to switch to receiving; if there is an incoming signal, the green indicator lights and the speaker activates. 5. Squelch Level Squelch sets the signal strength required to unmute the speaker. Lower levels allow longer range but admit more noise, while higher levels reduce background noise but limit range. The facto default is level 5, and it can be adjusted between 0 and 9 via CPS software. 6. TOT TOT prevents prolonged transmissions and protects the radio from overheating. If transmission exceeds the preset limit (0–180 seconds, set in CPS), the radio stops transmitting and emits a warning tone. Releasing the PTT resets the function. 7. Power-Saving Mode The radio can be set to Batte Save mode via CPS software. Note：a、Unchecked: Batte Save mode is o. b、Checked: Batte Save mode is on. 8. Monitor The monitor function, programmable to a side key, opens the squelch so that weak or background signals can be heard. 9. Scan Channel 16 is used for scanning. When selected, the radio automatically scans through programmed channels to detect activity. 10. Channel Lock This function locks or unlocks the channel selector to prevent accidental operation. It can be assigned to a side key in CPS. 11. Roger Beep An optional tone can be sent at the roger beep. The feature is o by default and can be enabled through CPS. 12. Busy Channel Lock When enabled, it prevents transmission on a busy channel. Pressing the PTT under this condition will only trigger a warning beep until released. 13. VOX VOX feature enables transmission without pressing the PTT button—just speak into the mic to transmit, and it stops automatically when you stop talking. By default, long-press the side button to activate VOX, with voice 4 prompts ("VOX ON"/"VOX OFF") for status changes. This feature is o by default. a. When VOX is enabled on your radio's channel, speaking into the mic stas transmission automatically, and it stops when you're silent, waiting for incoming signals. b. When using a headset mic, adjust the VOX gain for proper sound level detection. Overly sensitive settings may trigger transmission with ambient noise, while insucient sensitivity may miss your voice. Fine-tune the gain for smooth communication. Note: With high VOX sensitivity and a connected speaker/mic, amplied received signals may unintentionally trigger transmission. 14. One-Key Emergency Ale Dene side-button long-press via CPS for emergency ales. Hold for 2s to activate; press PTT to exit. 15. One-Key CTCSS/DCS O On Channel 3, long-press side + PTT at staup: "On" enables CTCSS/DCS; "O" disables it. 16. CTCSS/DCS Suppos 260 CTCSS/DCS codes: 50 analog CTCSS & 105*2 digital DCS (N/I- phase), set via software. 17. Batte Level Ale Sho-press side button for level announcement: batte voltage one/two/three，"One" (0-30%), "Two" (40-60%), "Three" (70-100%). 5 Facto Frequencies FRS Channel Frequency (MHz) CTCSS/DCSMax Power Output 1 462.562567.0 2W 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 462.5875 462.6125 462.6375 462.6625 462.6250 462.7250 462.6875 462.7125 462.5500 462.5750 462.6000 462.6500 462.6750 462.7000 462.7250 118.8 127.3 131.8 136.5 127.3 136.5 141.3 146.2 123.0 D743I D332I D243I D606N D731I D462I 2W 2W 2W 2W 2W 2W 2W 2W 2W 2W 2W 2W 2W 2W 2W 6 CAUTION Changes or modications not expressly approved by the pay responsible for compliance may void the user’s authority granted by the local government radio management depaments to operate this radio and should not be made. To comply with the corresponding requirements, transmitter adjustments should be made only by or under the supeision of a person ceied as technically qualied to peorm tra…

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Covered Equipment Attestation Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Section 2.911(d)(5)(i)-(ii) of the Commission’s Rules (47 C.F.R.) we attest as follows for the product listed below: FCC ID Model name 2ASNSRT21H RT21H, RT21 We, Applicant Company Name: Shenzhen Retevis Technology Co., Ltd. Address: 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Phone: +86-755-23481953 certify 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. This includes the cybersecurity and anti-virus software produced or provided by Kaspersky Lab, Inc. or any of ist successors and assignees. We certify 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. If you have any questions, please feel free to contact us at the address shown below. Sincerely, 2025-11-19 Signature Date Name / Title: Dongfang Shen / Manager Company: Shenzhen Retevis Technology Co., Ltd. Address: 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Phone: +86-755-23481953 Fax: N/A E-Mail: [email protected]

Due Diligence Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern FCC ID Model name 2ASNSRT21H RT21H, RT21 Pursuant to KDB 986446 D01 Covered Equipment Guidance the evaluation of the product above shows compliance for the following reasons: Compliance Evaluation process Results Inherent compliance The chipset(s) used is not capable of running the cybersecurity and/or anti-virus software Compliance The memory used does not allow the running the cybersecurity and/or anti-virus software Compliance The storage capacity does not allow the running the cybersecurity and/or anti-virus software Compliance The operating system used is not capable of running the cybersecurity and/or anti-virus software Compliance No inherent compliance Based on software bill of material Based on scan for running software on the device Based on filesystem scan for cybersecurity and/or anti-virus software The equipment for which authorization is sought complies with the rules and fulfils the requirements as detailed in the above mentioned KDB. Evaluation performed by Company Name: Shenzhen LCS Compliance Testing Laboratory Ltd. Contact Name: Martion Lee Address: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China Phone: +86-755-82591330 Email: [email protected] Signature: Date: 2025-11-13

Confidentiality Request Letter For Certification Service in the USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Paragraphs §0.457 and 0.459 of the Commission’s Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we request confidentiality for the documentation of the following products: FCC ID Model name 2ASNSRT21H RT21H, RT21 For the products listed above, we request permanent confidentiality for all applicable exhibits as there are: • the Operational Description • the Block Diagram • the Schematics • the Part List • the Tune up Information The above listed exhibits contain trade secrets and proprietary information that could be of benefit to our competitors. If you have any questions, please feel free to contact us at the address shown below. Sincerely, 2025-11-19 Signature Date Name / Title: Dongfang Shen / Manager Company: Shenzhen Retevis Technology Co., Ltd. Address: 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Phone: +86-755-23481953 Fax: N/A E-Mail: [email protected]

Shenzhen Retevis Technology Co., Ltd. 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Date: November 19, 2025 FCC ID: 2ASNSRT21H Model Number: RT21H, RT21 To: Federal Communication Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21048 To Whom It May Concern, We, Shenzhen Retevis Technology Co., Ltd. hereby declare that our product (TWO WAY RADIO) Model Number: RT21H, RT21 board, Schematic, Hardware version, Software version, structure and internal photos are same, named differently due to marketing purposes. Should you have any questions or comments regarding this matter, please have my best attention. Sincerely, (Signed) Name / Title: Dongfang Shen / Manager Company: Shenzhen Retevis Technology Co., Ltd. Address: 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Phone: +86-755-23481953 Fax: N/A E-Mail: [email protected]

Page1of5FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. ExternalPhotosoftheEUT Fig.1 Fig.2 Page2of5FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.3 Fig.4 Page3of5FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.5 Fig.6 Page4of5FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.7 Fig.8 Page5of5FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.9

Page1of2FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. LABELANDLOCATION (Size:L5.0cmxW2.5cm) LabelLocation TWOWAYRADIO Model:RT21H FCCID:2ASNSRT21H Page2of2FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China.

Page1of6FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. InternalPhotosoftheEUT Fig.1 Fig.2 Page2of6FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.3 Fig.4 Page3of6FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.5 Fig.6 Antenna Page4of6FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.7 Fig.8 Page5of6FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.9 Fig.10 Page6of6FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. Fig.11 Fig.12

Page 1 of 66 Report No.: AiTSZ-251022053FW1 FCC SAR EVALUATION REPORT In accordance with the requirements of FCC 47 CFR Part 2(2.1093) and IEEE Std 1528-2013 Product Name: TWO WAY RADIO Model No.: RT21H Serial Model: RT21 Brand Name: RETEVIS Report No.: AiTSZ-251022053FW1 FCC ID: 2ASNSRT21H Prepared for Shenzhen Retevis Technology Co., Ltd. 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Prepared by Guangdong Asia Hongke Test Technology Limited B1/F, Building 11, Junfeng Industrial Park, Chongqing Road, Heping Community, Fuhai Street, Bao'an District, Shenzhen, Guangdong, China Tel.: +86 0755-230967639 Fax.: +86 0755-230967639 Page 2 of 66 Report No.: AiTSZ-251022053FW1 TEST RESULT CERTIFICATION Applicant’s name ................. : Shenzhen Retevis Technology Co., Ltd. Address ................................. : 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Manufacturer's Name .......... : Shenzhen Retevis Technology Co., Ltd. Address ................................. : 7/F, 13-C, Zhonghaixin Science&Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China Product description Product name ........................ : TWO WAY RADIO Trademark ........................... : RETEVIS Model and/or type reference : RT21H Serial Model........................... : RT21 Standards ............................. : FCC 47 CFR Part 2(2.1093) IEEE Std 1528-2013 Published RF exposure KDB procedures This device described above has been tested by Guangdong Asia Hongke Test Technology Limited. In accordance with the measurement methods and procedures specified in IEEE Std 1528-2013 and KDB 865664 D01.Testing has shown that this device is capable of compliance with localized specific absorption rate (SAR) specified in FCC 47 CFR Part 2(2.1093). The test results in this report apply only to the tested sample of the stated device/equipment. Other similar device/equipment will not necessarily produce the same results due to production tolerance and measurement uncertainties. This report shall not be reproduced except in full, without the written approval of Guangdong Asia Hongke Test Technology Limited, this document may be altered or revised by Guangdong Asia Hongke Test Technology Limited, personal only, and shall be noted in the revision of the document. Test Sample Number .............................. : AiTSZ-251022053-1 Date of Test Date (s) of performance of tests ............. : Oct. 30, 2025 Date of Issue .......................................... : Nov. 14, 2025 Test Result.............................................. : Pass Reviewed by: Approved by: Ken Zou Jack Li Page 3 of 66 Report No.: AiTSZ-251022053FW1 ※ ※ Revision History ※ ※ REV. DESCRIPTION ISSUED DATE REMARK Rev.1.0 Initial Test Report Release Nov. 14, 2025 Jack Li Page 4 of 66 Report No.: AiTSZ-251022053FW1 TABLE OF CONTENTS 1. General Information .......................................................................................... 6 1.1. RF exposure limits .................................................................................. 6 1.2. Statement of Compliance ....................................................................... 7 1.3. EUT Description ..................................................................................... 8 1.4. Test specification(s) ................................................................................ 8 1.5. Ambient Condition ................................................................................. 8 1.6. Test Facility ............................................................................................. 9 2. SAR Measurement System ............................................................................... 10 2.1. SATIMO SAR Measurement Set-up Diagram ......................................... 10 2.2. Robot ................................................................................................... 11 2.3. Probe ................................................................................................... 12 2.3.1. E-Field Probe Calibration ................................................................ 12 2.4. Phantoms ............................................................................................. 13 2.5. Technical Data ...................................................................................... 14 2.6. Device Holder ...................................................................................... 15 2.7. Test Equipment List .............................................................................. 17 3. SAR Measurement Procedures ........................................................................ 20 3.1. Power Reference.................................................................................. 20 3.2. Area scan & Zoom scan ........................................................................ 20 3.3. Description of interpolation/extrapolation scheme ............................. 21 3.4. Volumetric Scan ................................................................................... 22 3.5. Power Drift .......................................................................................... 22 4. System Verification Procedure ......................................................................... 23 4.1. Tissue Verification ................................................................................ 23 4.1.1. Tissue Dielectric Parameter Check Results ..................................... 24 4.2. System Verification Procedure ............................................................. 25 4.2.1. System Verification Results ............................................................ 26 5. SAR measurement variabilit ............................................................................. 27 6. SAR Measurement Uncertainty…

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Page1of24FCCID:2ASNSRT21HReportNo.:AiTSZ-251112028FW1 Note:Thisdevicehasbeentestedandfoundtocomplywiththestandard(s)listed,thistestreportmerelycorrespondstothetestsample.Itis notpermittedtocopyextractsofthesetestresultwithoutthewrittenpermissionofthetestlaboratory.Thisreportshallnotbereproduced exceptinfull,withoutthewrittenapprovalofGuangdongAsiaHongkeTestTechnologyLimited.Ifthereisaneedtoalterorrevisethis document,therightbelongstoGuangdongAsiaHongkeTestTechnologyLimited,anditshouldgiveapriorwrittennoticeoftherevision document.Thistestreportmustnotbeusedbytheclienttoclaimproductendorsement. GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. TESTREPORT ProductName: TWOWAYRADIO BrandName: RETEVIS Model: RT21H SeriesModel: RT21 Applicant: ShenzhenRetevisTechnologyCo.,Ltd. Address: 7/F,13-C,ZhonghaixinScience&TechnologyPark,No.12 Ganli6thRoad,JihuaStreet,LonggangDistrict,Shenzhen, China Manufacturer: ShenzhenRetevisTechnologyCo.,Ltd. Address: 7/F,13-C,ZhonghaixinScience&TechnologyPark,No.12 Ganli6thRoad,JihuaStreet,LonggangDistrict,Shenzhen, China Standard(s): FCCCFR47PART95 DateofReceipt: October29,2025 DateofTest: October29,2025~November13,2025 IssuedDate: November13,2025 IssuedBy: GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'an District,Shenzhen,Guangdong,China Tel.:+860755-230967639Fax.:+860755-230967639 Reviewedby:Approvedby: Aalen.YeAllenWang Page2of24FCCID:2ASNSRT21HReportNo.:AiTSZ-251112028FW1 ReportReviseRecord ReportVersionIssuedDateNotes M1November13,2025InitialRelease Page3of24FCCID:2ASNSRT21HReportNo.:AiTSZ-251112028FW1 TABLEOFCONTENTS Description................................................................................................................................................Page 1.GENERALINFORMATION.....................................................................................................................................................4 1.1.DESCRIPTIONOFDEVICE(EUT)........................................................................................................................................4 1.2.SUPPORTEQUIPMENTLIST.................................................................................................................................................5 1.3.EXTERNALI/OCABLE..........................................................................................................................................................5 1.4.DESCRIPTIONOFTESTFACILITY........................................................................................................................................5 1.5.STATEMENTOFTHEMEASUREMENTUNCERTAINTY..........................................................................................................5 1.6.MEASUREMENTUNCERTAINTY............................................................................................................................................6 1.7.DESCRIPTIONOFTESTMODES..........................................................................................................................................6 2.TESTMETHODOLOGY..........................................................................................................................................................7 2.1.TESTSTANDARDS..........................................................................................................................................................7 2.2.EUTCONFIGURATION.........................................................................................................................................................7 2.3.EUTEXERCISE....................................................................................................................................................................7 2.4.GENERALTESTPROCEDURES............................................................................................................................................7 2.5.TESTSAMPLE......................................................................................................................................................................7 3.SYSTEMTESTCONFIGURATION.......................................................................................................................................8 3.1.JUSTIFICATION.....................................................................................................................................................................8 3.2.EUTEXERCISESOFTWARE................................................................................................................................................8 3.3.SPECIALACCESSORIES.......................................................................................................................................................8 3.4.BLOCKDIAGRAM/SCHEMATICS...........................................................................................................................................8 3.5.EQUIPMENTMODIFICATIONS...............................................................................................................................................8 3.6.TESTSETUP.........................................................................................................................................................................8 4.SUMMARYOFTESTRESULTS...........................................................................................................................................9 5.MEASUREMENTRESULTS................................................................................................................................................10 5.1.MAXIMUMTRANSMITTERPOWER.........................................................................................................................…

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FCC ID: 2ASNSRT21H Front of face (Separation distance of 25mm) Body worn (Separation distance of 0mm) Face Separation Distances(mm) bottom surface of the DUT antenna's base antenna's tip 28 30 33 Body Separation Distances(mm) bottom surface of the DUT antenna's base antenna's tip 3 22 28

Page1of1FCCID:2ASNSRT21H GuangdongAsiaHongkeTestTechnologyLimited B1/F,Building11,JunfengIndustrialPark,ChongqingRoad,HepingCommunity,FuhaiStreet,Bao'anDistrict,Shenzhen,Guangdong, China. TestSetupPhotosoftheEUT TestSetupPhoto(s)ofRadiatedEmissionsMeasurement Fig.1 Fig.2