2AHFT899Smart Watch

1. App downloads App Stor e, Google Play or by scanning the QR code below. App downloads and pairing EN must be used for charging. -> Activ at e Bluetooth connection on your phone -> Search on the app for the device to pair with (or scan the QR code on the device) -> Finish binding on the app (or on the device). 2. Pairing Button 1: return to the home screen and light up when the screen Button 2: light up the scre list when it is on. Long press Button 1: turn the wat ch on and 8 seconds to hard reboot. Turning on on charge. Physical button operation - Long press the button 1 to turn on the wat ch. Swipe up/down 1. To toggle through menu. 2. To view long text/ details. Swipe left/ right 1. To toggle through menu. Screen operation Do not place the product and its accessorie s at extreme temperatures, otherwise it may cause hazards such as product Protect the product from strong impacts or jolts, so as not to damage the product and its accessorie s, thus avoiding product failures. Do not disassemble or modify the product and its accessorie s fails. Safety instructions GTX21 has features such as 3ATM wat er resistance, ultra-long monitoring and stress detec tion throughout the day, blood oxy gen detec tion and body energy detec tion and sleep monitoring, etc. F or operating instructions and FAQs on these features, please turn on the app and go to “User Guide” section. Tap the screen 1. To enter the menu. 2. To operat e accor ding to the pr ompts. Tap and hold on the screen 1. To switch between wat ch fac es. Features Three suggestions for use and maintenance: 1. Keep the product clean; 3. Do not wear the product too tight; * Do not use household cleansers when cleaning the product. Use soap-free cleansers instead. * For stubborn stains, it is recommended to remove by scrubbing with alcohol. Waterproof: Not suitable for use while diving, swimming in the sea, or in a sauna. Suitable for use in swimming pools, showers (cold water) and shallows. Care and maintenance 1. App herunterladen Play oder durch Scannen des nachstehenden QR-Codes herunter und installieren Sie sie. App herunterladen und koppeln DE 1. Produktübersicht Kurz drücken der Bildschirm ausgeschaltet ist. Taste2: leuchtet der Bildschirm auf, wenn er ausgeschaltet ist, Gedrückt halten Kurzanleitung 2. Einschalten/Ausschalten Einschalten Solange die Uhr ausgeschaltet ist, schaltet sie sich automatisch ein, wenn Sie aufgeladen wird. Hinweis: Laden Sie die Uhr auf, um sie vor Erstgebrauch zu aktivieren. Zum Laden muss das Original-Netzteil verwendet werden. Tastenfunktion -> Aktivieren Sie die Bluetooth-Verbindung auf Ihrem Handy -> Suchen Sie in der App nach dem Gerät, mit dem Sie koppeln möchten (oder scannen Sie den QR-Code auf dem Gerät) -> Schließen Sie die Kopplung in der App (oder auf dem Gerät) ab. 2. Koppeln Ausschalten Uhr ausschalten: Navigieren Sie im Menü zu Einstellungen -> Ausschalten. Halten Sie die Taste1 gedrückt, um die Uhr einzuschalten. 1. um das Menü zu durchlaufen. 2. um lange Texte/Details anzuzeigen. Nach links/ rechts wischen 1. um das Menü zu durchlaufen. Bildschirmbedienung Setzen Sie das Produkt und sein Zubehör keinen extr emen Temperaturen aus, da dies zu Gefahren wie Ausfall, Feuer oder Explosion führen kann. Schützen Sie das Produkt vor starken Stößen und Er schütterungen, um das Produkt und sein Zubehör nicht zu beschädigen und somit Produktausfälle zu vermeiden. Demontieren und verändern Sie das Produkt und sein Zubehör nicht selbst. Wenden Sie sich an den Kundendienst, wenn das Produkt ausfällt. Sicherheitshinweise Was serbeständigkeit, ultralange Akkulaufzeit, Vollbild-Touch-Bedienung, geringe Lat enz, 110 Trainingsmodi Herzfrequenzüberwachung und den Stresspegelerkennung im Erkennung der Körperenergie und die Schlafüberwachung zu diesen Funktionen, aktivieren Sie bitte die App und besuchen Sie den Abschnitt „Bedienungsanleitung“. Auf den Bildschirm tippen 1. um das Menü aufzurufen. zu arbeiten. Bildschirm gedrückt halten Funktionen 2. Halten Sie das Produkt trocken; 3. Tragen Sie das Produkt nicht zu eng am Handgelenk; * Verwenden Sie zur Reinigung des Produkts keine Haushaltsreiniger. Verwenden Sie stattdessen ein seifenfreies Reinigungsmittel. * Abwischen mit Alkohol zu entfernen. Was serdicht: Nicht zur Verwendung beim Tauchen, Schwimmen im Meer oder in der Sauna geeignet. Geeignet für den Einsatz in Schwimmbädern, Duschen (kaltes Was ser) und in Ufernähe. 1. Desc ar ga de aplicaciones App Stor e, Google Play o esc aneando el código QR siguiente. Descarga de aplicaciones y vinculación ES 1. Vista general de producto Pulsación breve Botón 1: volver a la pantalla de inicio, se encienden cuando la pantalla está apagada. Botón 2: ilumina la pantalla cuando está apagada y pasa a la Mantener pulsado Botón 1: enciende el reloj y 8 segundos par a reiniciarlo. Botón 2: 5 segundos par a entrar en la pantalla de desc onexión. Guía de inicio rápido 2. Encendido/apagado Encendido Si el reloj está apagado, se enciende automáticamente al ponerlo a car gar. Nota: Cargue el reloj par a ac tiv arlo antes de usarlo por primera vez . Se debe usar el adaptador de corriente original par a cargar. Funcionamiento del botón físico teléfono. En la aplicación, busque el dispositivo par a vincularlo (o esc anee el código QR en el dispositivo). Complete la vinculación en la aplicación (o en el dispositivo). 2. Vinculación Apagar Par a apagar el reloj: vaya al menú de Ajustes -> Apagado. Mantenga pulsado el Botón 1 par a encender el reloj. Deslizar hacia arriba/ abajo 1. par a desplazar se por el menú. 2. par a ver textos largos/detalles. Deslizar hacia la izquierda/derecha 1. par a desplazar se por el menú. Funcionamiento de la pantalla No coloque el producto y sus accesorios en lugares con temperaturas extr emas, de lo contrario, podrían producirse riesgos como fallos del producto, incendios o explosiones. que el producto y sus accesorios no resulten dañados y así evitar fallos del producto. usted mismo. En caso de fallo d…

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Report No.: TSEA26070076601 Appendix B BT Scans Setup Area ScanZoom Scan Grid Extents [mm]96.0 x 96.030.0 x 30.0 x 30.0 Grid Steps [mm]12.0 x 12.05.0 x 5.0 x 5.0 Sensor Surface [mm]3.01.4 Graded GridN/AYes Grading RatioN/A1.5 MAIAYY Surface DetectionVMS + 6pVMS + 6p Scan MethodMeasuredMeasured Measurement Results Area ScanZoom Scan Date2026-08-25, 22:132026-08-25, 22:19 psSAR1g [W/Kg]0.0450.045 psSAR10g [W/Kg]0.0230.023 Power Drift [dB]0.09-0.09 Power ScalingDisabledDisabled Scaling Factor [dB] TSL CorrectionNo correctionNo correction M2/M1 [%]65.8 Dist 3dB Peak [mm]10.3 Test Laboratory: TOWE Lab Measurement Report for , FRONT, ISM 2.4 GHz Band, Bluetooth Low Energy, Channel 78 (2480.000 MHz) Device Under Test Properties ModelDimensions [mm] 45.0 x 45.0 x 12.0 Exposure Conditions Phantom Section, TSLPosition, Test Distance [mm] BandGroup, UIDFrequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid FRONT, 10.00ISM 2.4 GHz Band Bluetooth, 10670- AAA 2480.000, 787.241.8540.2 Hardware Setup PhantomTSLProbe, Calibration DateDAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2173HBBL-600-10000 LiquidEX3DV4 - SN7812, 2026-01-19DAE4ip Sn1847, 2026-03-17 Scans Setup Area ScanZoom Scan Grid Extents [mm]96.0 x 96.030.0 x 30.0 x 30.0 Grid Steps [mm]12.0 x 12.05.0 x 5.0 x 5.0 Sensor Surface [mm]3.01.4 Graded GridN/AYes Grading RatioN/A1.5 MAIAYY Surface DetectionVMS + 6pVMS + 6p Scan MethodMeasuredMeasured Measurement Results Area ScanZoom Scan Date2026-08-26, 02:052026-08-26, 02:10 psSAR1g [W/Kg]0.0370.036 psSAR10g [W/Kg]0.0170.017 Power Drift [dB]0.05-0.03 Power ScalingDisabledDisabled Scaling Factor [dB] TSL CorrectionNo correctionNo correction M2/M1 [%]76.4 Dist 3dB Peak [mm]6.0 Test Laboratory: TOWE Lab Measurement Report for , BACK, ISM 2.4 GHz Band, Bluetooth Low Energy, Channel 78 (2480.000 MHz) Device Under Test Properties ModelDimensions [mm] 45.0 x 45.0 x 12.0 Exposure Conditions Phantom Section, TSLPosition, Test Distance [mm] BandGroup, UIDFrequency [MHz], Channel Number Conversion Factor TSL Conductivity [S/m] TSL Permittivity Flat, Head Simulating Liquid BACK, 0.00ISM 2.4 GHz Band Bluetooth, 10670- AAA 2480.000, 787.241.8540.2 Hardware Setup PhantomTSLProbe, Calibration DateDAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2173HBBL-600-10000 LiquidEX3DV4 - SN7812, 2026-01-19DAE4ip Sn1847, 2026-03-17

Report No.: TSEA26070076601 Appendix D 1. Test Sample Photo 1: Front View Photo 2: Back View Photo 3: Antenna Locations Report No.: TSEA26070076601 2. Test positions Photo 4: Front side 10mm Photo 5: Back side 0mm

1Photographs-EUTTestSetup 1.1RadiatedSpuriousEmission 9kHz~30MHz: 30MHz~1GHz: Above1GHz: 1.2 ConductedEmission 1.3 RFConductedmeasurement

CQASZ20260601153E-01 AppendixA:DTSBandwidth TestResult TestModeFreq(MHz) DTSBW [MHz] FL[MHz]FH[MHz]Limit[MHz]Verdict BLE_1M 24020.672401.652402.320.5PASS 24400.672439.652440.320.5PASS 24800.672479.652480.320.5PASS TestGraphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 AppendixB:OccupiedChannelBandwidth TestResult TestModeAntennaFreq(MHz) OCB[MHz] FL[MHz]FH[MHz]Limit[MHz]Verdict BLE_1MAnt1 24021.0312401.48052402.5115------ 24401.0312439.48052440.5115------ 24801.0312479.48052480.5115------ TestGraphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 AppendixC:Maximumconductedoutputpower TestResultPeak TestModeFreq(MHz) Conducted Peak Powert[dBm] Conducted Limit[dBm] Verdict BLE_1M 24027.75≤30PASS 24409.45≤30PASS 24807.45≤30PASS TestGraphsPeak BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 AppendixD:Maximumpowerspectraldensity TestResult TestModeFreq(MHz)Result[dBm/3kHz]Limit[dBm/3kHz]Verdict BLE_1M 2402-7.18≤8.00PASS 2440-5.40≤8.00PASS 2480-7.63≤8.00PASS TestGraphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 AppendixF:Bandedgemeasurements TestResult TestModeChNameFreq(MHz)RefLevel[dBm]Result[dBm]Limit[dBm]Verdict BLE_1M Low24027.65-40.23≤-12.35PASS High24807.29-42.7≤-12.71PASS TestGraphs BLE_1M_Ant1_Low_2402 BLE_1M_Ant1_High_2480 AppendixG:ConductedSpuriousEmission TestResult NO. Test Condition Test Mode Freq (MHz) RateAntenna FrequencyRange (MHz) Ref Level (MHz) Max Power (dBm) Limit (dBm) Verdict 1NTNVBLE24021MbpsANT1 Reference0.17.46// 30～10000.1-47.84≤-12.54Pass 1000～265000.1-36.05≤-12.54Pass 2NTNVBLE24401MbpsANT1 Reference0.17.35// 30～10000.1-47.93≤-12.65Pass 1000～265000.1-36.96≤-12.65Pass 3NTNVBLE24801MbpsANT1 Reference0.17.9// 30～10000.1-47.89≤-12.10Pass 1000～265000.1-36.79≤-12.10Pass TestGraphs NTNV_BLE_2402_1Mbps NTNV_BLE_2440_1Mbps NTNV_BLE_2480_1Mbps AppendixH:DutyCycle TestResult TestModeFreq(MHz) ONTime [ms] Period [ms] XDC [%] xFactor LimitVerdict BLE_1M 24020.410.620.661366.131.80------ 24400.410.620.661366.131.80------ 24800.410.620.661366.131.80------ TestGraphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480

SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD 102A,102B,Building2,ShanghenglangNewIndustrialZone,ShanghenglangCommunity, DalangStreet,LonghuaDistrict,Shenzhen,Guangdong,People’sRepublicofChina,518000 Telephone:+86-755-26648640 Fax:+86-755-26648637 Website:www.cqa-cert.com ReportTemplateVersion:V06 ReportTemplateRevisionDate:2026-01-30 TestReport Thetestreportiseffectiveonlywithbothsignatureandspecializedstamp,Theresult(s)showninthisreportreferonly tothesample(s)tested.WithoutwrittenapprovalofCQA,thisreportcan’tbereproducedexceptinfull. ReportNo.:CQASZ20260601153E-01 Applicant:ShenzhenDOIntelligentTechnologyCo.,Ltd AddressofApplicant:11thFloor,3#Building,GuoleTechPark,LirongRoad,Dalang,Longhua District,Shenzhen,China EquipmentUnderTest(EUT): Product:SmartWatch ModelNo.:GTX21,AR-03 TestModelNo.:GTX21 BrandName:IDO FCCID:2AHFT899 Standards:47CFRPart15,SubpartC KDB558074D0115.247MeasGuidancev05r02 ANSIC63.10:2020 DateofReceipt:2026-06-01 DateofTest: 2026-06-01to2026-06-10 DateofIssue:2026-07-20 TestResult:PASS* *Intheconfigurationtested,theEUTcompliedwiththestandardsspecifiedabove. TestedBy: (LewisZhou) ReviewedBy: (TimoLei) ApprovedBy: (JackAi) SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD ReportNo.:CQASZ20260601153E-01 Page: 2 of 34 1Version RevisionHistoryOfReport ReportNo.Version Description IssueDate CQASZ20260601153E-01Rev.01Initialreport2026-07-20 Note: ModelNo.:GTX21,AR-03 OnlythemodelGTX21Theirelectricalcircuitdesign,layout,componentsusedandinternalwiringare identical,Onlythemodelnameisdifferent. Thedifferencebetweenproduct#1andproduct#2isthatthescreenandBatterymodel isdifferentincludinghavingdifferentscreenandBatterysupplier.Thekeydifferencesaretheappearanceand themodelnumber.ThesechangesdonotaffectRFperformance. 1# Screen Model:AC-A1D32E-066 Supplier:JIANGXIHUALINOPTRONICSCO.,LTD Battery Model:551925 Supplier:ZHONGSHANZHONGWANGDENEWENERGYTECHNOLOGYCO.,LTD. 2# Screen Model:RG132ON1993_V01 Supplier:ShenzhenRenGuanElectronicsCo.,Ltd. Battery Model:551925 Supplier：SHENZHENHEYINGXINNENGELECTRONICSCO.,LTD. SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD ReportNo.:CQASZ20260601153E-01 Page: 3 of 34 2TestSummary TestItemTestRequirementTestmethodResult AntennaRequirement 47CFRPart15,SubpartCSection 15.203/15.247(c) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS ACPowerLine Conducted Emission 47CFRPart15,SubpartCSection 15.207 ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS ConductedPeakOutput Power 47CFRPart15,SubpartCSection 15.247(b)(3) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS 6dBOccupied Bandwidth 47CFRPart15,SubpartCSection 15.247(a)(2) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS PowerSpectralDensity 47CFRPart15,SubpartCSection 15.247(e) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS Band-edgeforRF ConductedEmissions 47CFRPart15,SubpartCSection 15.247(d) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS RFConductedSpurious Emissions 47CFRPart15,SubpartCSection 15.247(d) ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS RadiatedSpurious Emissions 47CFRPart15,SubpartCSection 15.205/15.209 ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS Restrictedbandsaround fundamentalfrequency (RadiatedEmission) 47CFRPart15,SubpartCSection 15.205/15.209 ANSI C63.10- 2020+Cor.1- 2023+C63.10a-2024+ ErratatoC63.10a-2024 PASS SHENZHENHUAXIATESTINGTECHNOLOGYCO.,LTD ReportNo.:CQASZ20260601153E-01 Page: 4 of 34 3Contents Page 1VERSION..........................................................................................................................................................................2 2TESTSUMMARY............................................................................................................................................................3 3CONTENTS......................................................................................................................................................................4 4GENERALINFORMATION...........................................................................................................................................5 4.1CLIENTINFORMATION.................................................................................................................................................5 4.2GENERALDESCRIPTIONOFEUT.................................................................................................................................5 4.3ADDITIONALINSTRUCTIONS........................................................................................................................................7 4.4TESTENVIRONMENT...................................................................................................................................................8 4.5DESCRIPTIONOFSUPPORTUNITS...............................................................................................................................8 4.6TESTCONFIGURATION................................................................................................................................................8 4.7STATEMENTOFTHEMEASUREMENTUNCERTAINTY....................................................................................................9 4.8TESTLOCATION........................................................................................................................................................10 4.9TESTFACILITY..........................................................................................................................................................10 4.10DEVIATIONFROMSTANDARDS................................................................................................................................10 4.11OTHERINFORMATIONREQUESTEDBYTHECUSTOMER..........................................................................................10 4.12EQUIPMENTLIST.................…

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SHENZHEN YUSHENG COMMUNICATION EQUIPMENT CO., LTD Add: 407-411, Floor 4, Building 2, Yuntai Chuanggu Park, southeast of the intersection of Guangming Avenue and Dongchang Road, Guangming District, Shenzhen ANTENNA REPORT GTX21 BT&GPS L1 2026-07-17 GPS_SWR BT_SWR BT efficiecy BT Gain=-4.1dBi Free-space Freq （MHz） Effi (%) Gain （dBi） 2400 12.1%-4.9 2410 12.3%-4.7 2420 12.5%-4.6 2430 12.7%-4.5 2440 13.2%-4.3 2450 13.4%-4.1 2460 13.2%-4.2 2470 13.1%-4.4 2490 12.8%-4.5 GPS efficiecy GPS Gain=-4.2dBi Free-space Freq （MHz） Effi (%) Gain （dBi） 155010.3%-4.8 155510.5%-4.7 156010.9%-4.6 156511.6%-4.5 157012.6%-4.3 157514.1%-4.2 158012.5%-4.5 158511.3%-4.7 BT GPS Antenna size mm BT Antenna size mm GPS Thank you！

Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. Report No.: TSEA26070076601 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. FCC SAR Test Report Applicant: Shenzhen DO Intelligent Technology Co., Ltd EUT Description: Smart Watch Model: GTX21, AR-03 Test Model: GTX21 Brand: IDO FCC ID: 2AHFT899 Standards: FCC 47CFR §2.1093 Date of Receipt: 2026/07/28 Date of Test: 2026/08/25 to 2026/08/26 Date of Issue: 2026/08/26 TOWE tested the above equipment in accordance with the requirements set forth in the above standards. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. The results documented in this report apply only to the tested sample, under the conditions and modes of operation as described herein. It is the manufacturer's responsibility to assure that additional production units of the model are manufactured with identical electrical and mechanical components. All samples tested were in good operating condition throughout the entire test program. Measurement Uncertainties are published for informational purposes only and were not taken into account unless noted otherwise. Without written approval of TOWE, the test report shall not be reproduced except in full. Jim Huang Approved By: Jack Li Reviewed By: Page 2 / 23 Report No.: TSEA26070076601 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Revision History Rev. Issue Date Description Revised by 01 2026/08/26 Original Jack Li Page 3 / 23 Report No.: TSEA26070076601 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Table of Contents 1 Summary of Test Results .................................................................................................................................. 5 2 Guidance Applied ............................................................................................................................................... 6 3 Lab Information .................................................................................................................................................. 6 3.1 Testing Location ...................................................................................................................................................................... 6 3.2 Test Facility / Accreditations ................................................................................................................................................ 6 3.3 Ambient Condition .................................................................................................................................................................. 6 4 Client Information ............................................................................................................................................... 6 4.1 Applicant ................................................................................................................................................................................... 6 4.2 Manufacturer ............................................................................................................................................................................ 6 4.3 Factory ....................................................................................................................................................................................... 6 5 Product Information ........................................................................................................................................... 7 6 RF Exposure Limits ........................................................................................................................................... 8 7 Introduction ......................................................................................................................................................... 9 7.1 SAR Definition .......................................................................................................................................................................... 9 8 SAR Measurements System ........................................................................................................................... 10 8.1 The SAR Measurement Set-up ........................................................................................................................................... 10 8.2 E-Field Probe .......................................................................................................................................................................... 11 8.3 Data Acquisition Electronics (DAE) .................................................................................................................................. 11 8.4 Phantom .................................................................................................................................................................................. 12 8.5 Device Holder .............................................................…

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Report No.: TSEA26070076601 Appendix C EX3DV4-SN 7812 DAE4-SN 1847 D2450V2-SN 1099

ShenzhenDOIntelligentTechnologyCo.,Ltd Date:August4,2026 EurofinsElectricalandElectronicTestingNA,Inc. 914WestPatapscoAvenue Baltimore,MD21230 RE:AttestationStatementsPart2.911(d)(5)(i)requestforFCCID:2AHFT899 [ShenzhenDOIntelligentTechnologyCo.,Ltd](“theapplicant”)certifiesthatthe equipmentforwhichauthorizationissoughtisnot“covered”equipmentprohibited fromreceivinganequipmentauthorizationpursuanttosection2.903oftheFCCrules. Wealsocertifythat,asofthedateofthefilingoftheapplication,theequipmentdoes notutilizecyber-securityoranti-virussoftwarefromKasperskyLab,Inc,oranyofits successorsandassignees,whichisalsoonthe“coveredlist”. Sincerely, (Applicantsignature)： (Applicantprintedname)：WuDajun (Title)：Generalmanager_ (Company)：ShenzhenDOIntelligentTechnologyCo.,Ltd ShenzhenDOIntelligentTechnologyCo.,Ltd Date:August4,2026 EurofinsElectricalandElectronicTestingNA,Inc. 914WestPatapscoAvenue Baltimore,MD21230 RE:AttestationStatementsPart2.911(d)(5)(ii)requestforFCCID:2AHFT899 [ShenzhenDOIntelligentTechnologyCo.,Ltd](“theapplicant”)certifiesthat,asofthe dateofthefilingoftheapplication,theapplicantisnotidentifiedontheCoveredListas anentityproducing“covered”equipment. Sincerely, (Applicantsignature)： (Applicantprintedname)：WuDajun (Title)：Generalmanager_ (Company)：ShenzhenDOIntelligentTechnologyCo.,Ltd

Report No.: TSEA26070076601 Appendix A System Check 2450 MHz Head Scans Setup Area ScanZoom Scan Grid Extents [mm]40.0 x 96.030.0 x 30.0 x 30.0 Grid Steps [mm]10.0 x 12.05.0 x 5.0 x 1.5 Sensor Surface [mm]3.01.4 Graded GridN/AYes Grading RatioN/A1.5 MAIAN/AN/A Surface DetectionVMS + 6pVMS + 6p Scan MethodMeasuredMeasured Measurement Results Area ScanZoom Scan Date2026-08-25, 20:502026-08-25, 20:56 psSAR1g [W/Kg]5.355.42 psSAR10g [W/Kg]2.552.51 Power Drift [dB]-0.05-0.02 Power ScalingDisabledDisabled Scaling Factor [dB] TSL CorrectionNo correctionNo correction Test Laboratory: TOWE Lab System Performance Check Report Summary DipoleFrequency [MHz]TSLPower [dBm]Dev. 1g [%]Dev. 10g [%]Dev. Peak [%]Iso. Error [%] D2450V2 - SN10992450.0HSL20.04.84.69.0-1.2 Exposure Conditions Phantom Section, TSLTest Distance [mm]BandGroup, UIDFrequency [MHz], Channel NumberConversion FactorTSL Conductivity [S/m]TSL Permittivity Flat, Head Simulating Liquid10CW, 02450.000, 07.241.8340.3 Hardware Setup PhantomTSLProbe, Calibration DateDAE, Calibration Date Twin-SAM V8.0 (30deg probe tilt) - 2173HBBL-600-10000 LiquidEX3DV4 - SN7812, 2026-01-19DAE4ip Sn1847, 2026-03-17

Photographs-EUTConstructionalDetails GTX211# GTX212#

GTX21底壳镭雕 7X5mm 5X5mm 5.5X2.8mm 7X5mm 3X10.4mm F C C I D : 2 A H F T 8 9 9 I C : 2 3 0 2 3 - 2 A H F T 8 9 9 GTX21

AR-03底壳镭雕 7X5mm 5X5mm 5.5X2.8mm 7X5mm 3X10.4mm F C C I D : 2 A H F T 8 9 9 I C : 2 3 0 2 3 - 2 A H F T 8 9 9 AR-03

Photographs-EUTConstructionalDetails GTX21

ShenzhenDOIntelligentTechnologyCo.,Ltd ModelConfirmationLetter We, ShenzhenDOIntelligentTechnologyCo.,Ltd certifytheproduct: SmartWatch ModelNo.: GTX21,AR-03 FCCID：2AHFT899 IC:23023-2AHFT899HVIN:GTX21,AR-03 Theirelectricalcircuitdesign,layout,componentsusedandinternalwiringareidentical, Onlythecolorweredifferent. GTX21 AR-03 Signiture: GranteeContact:WuDajun CompanyName:ShenzhenDOIntelligentTechnologyCo.,Ltd Date:August4,2026

ShenzhenDOIntelligentTechnologyCo.,Ltd Date:August4,2026 EurofinsElectricalandElectronicTestingNA,Inc. 914WestPatapscoAvenue Baltimore,MD21230 RE:LETTEROFAGENTAUTHORIZATION FCCID:2AHFT899 ToWhomItMayConcern: We,theundersigned,herebyauthorizeShenzhenHuaxiaTestingTechnologyCo.,Ltd.toacton ourbehalfinallmattersrelatingtoapplicationforequipmentauthorization,includingthesigning ofalldocumentsrelatingtothesematters. Wealsoherebycertifythatnopartytotheapplicationauthorizedhereunderissubjecttothe denialofbenefits,includingFCCbenefits,pursuanttoSection5301oftheAnti-DrugAbuseAct of1988,21U.S.C.853(a). Thisagreementexpiresoneyearfromthecurrentdate. Sincerely, (Signature) ： (Printname)：WuDajun (Title)：Generalmanager_ (Company)：ShenzhenDOIntelligentTechnologyCo.,Ltd

ShenzhenDOIntelligentTechnologyCo.,Ltd Date:September2,2026 EurofinsElectricalandElectronicTestingNA,Inc. 914WestPatapscoAvenue Baltimore,MD21230 RE:CONFIDENTIALITYREQUESTFOR Product: SmartWatch ModelNO.:GTX21,AR-03 FCCID:2AHFT899 ToWhomItMayConcern: Thisletterservesasanofficialrequestforconfidentialityundersections0.457and0.459 ofCFR47.Wehaverequestedthatthe(Blockdiagram,circuitschematic,and operatingdescription)requiredtobesubmittedwiththisapplicationbepermanently withheldfrompublicreview. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsidered asproprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthese documentsmightbeharmfultoourcompanyandwouldgivecompetitorsanunfair advantageinthemarket. Pleasecontactmeifthereisanyinformationyoumayneed. Sincerely, (Signature) ： (Printname)：WuDajun (Title) ： Generalmanager_ (Company)：ShenzhenDOIntelligentTechnologyCo.,Ltd

ShenzhenDOIntelligentTechnologyCo.,Ltd 11thFloor,3#Building,GuoleTechPark,LirongRoad,Dalang,LonghuaDistrict, Shenzhen,China FederalCommunicationsCommission AuthorizationandEvaluationDivision EquipmentAuthorizationBranch 7435OaklandMillsRoad Columbia,MD21046 2026-8-04 U.S.AgentDesignation {ShenzhenDOIntelligentTechnologyCo.,Ltd}acknowledgestheirconsentforthefollowingcontactlocatedin theUnitedStatestoactastheiragentforserviceofprocessfortheequipmentforwhichauthorizationissought (FCCID:2AHFT899): NameandcompanyofU.S.agent:BridgeportAdvisoryLLC PhysicalU.S.addressofagent:3330W38THPL,CHICAGO,IL60632,UnitedStates FRNofU.S.agent:0037566148 EmailaddressofU.S.agent:[email protected] ContactNO.:(708)680-6688 BridgeportAdvisoryLLC.acknowledgestheirobligationtoacceptserviceofprocessonbehalfof{ShenzhenDO IntelligentTechnologyCo.,Ltd}. {ShenzhenDOIntelligentTechnologyCo.,Ltd}withtheFRN[{0025289893}]acceptsitsobligationtomaintain anagentforserviceofprocessintheUnitedStatesfornolessthanoneyearaftereitherthegranteehas permanentlyterminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S.,ortheconclusion ofanyCommission-relatedadministrativeorjudicialproceedinginvolvingtheequipment,whicheverislater. Bysigningthisform,weconfirmtheaboveandthatweareawareoftheapplicationrequirementslistedunder§ 2.911(d)(7). TheinformationprovidedinthisletterisbasedonthereferencedrulepartsofTitle47oftheCFRaswellasKDB 986446D01. Anexpirationdateforthisletterdoesno…

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