2BEWX-TTFM-81GSmart Sentry

ZhejiangLingzhuTechnologyCo.,Ltd. To:FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:04-08-2026 Ref:AttestationStatementsPart2.911(d)(7)Filing FCCID:2BEWX-TTFM-81G [ZhejiangLingzhuTechnologyCo.,Ltd.](“theapplicant”)certifiesthat,asofthedateofthefilingofthe application,(TuyaSmartInc.)isourdesignatedU.S.agentforserviceofprocessfortheabove referencedFCCID.[ZhejiangLingzhuTechnologyCo.,Ltd.]acceptstomaintainanagentfornolessthan oneyearafterthegranteehasterminatedallmarketingandimportationortheconclusionofany Commission-relatedproceedinginvolvingtheequipment. (TuyaSmartInc.)accepts,asofthedateofthefilingoftheapplication,theobligationofthedesignated U.S.agentforserviceofprocessfortheabovereferencedFCCID. DesignatedU.S.AgentInformation: Name:TuyaSmartInc.(FRN:0034102913) Address:160GreentreeDrive,Suite101,Dover,DELAWARE,19904 ContactPerson:JingchaoWang Tel.:818-699-5031 Email:[email protected] Sincerely, [InsertU.S.agentcompanyname]TuyaSmartInc. FRNnumber0034102913 (Applicantprintedname)JingchaoWang (U.S.agentcompanynamesignature) [Insertapplicantname]ZhejiangLingzhuTechnologyCo.,Ltd. FRNnumber0034841213 (Applicantprintedname)/E-mailLinyunLi/[email protected] (Applicantsignature)

ZhejiangLingzhuTechnologyCo.,Ltd. FederalCommunicationsCommission 7435OaklandMillsRoad ColumbiaMD21046 Date:April8,2026 Subject:Certificationsconcerning“covered”equipmentpursuanttoPart2.911(d)(5)(i)and(ii) FCCID:2BEWX-TTFM-81G Towhomitmayconcern, ZhejiangLingzhuTechnologyCo.,Ltd.certifiesthattheequipmentforwhichauthorizationissoughtisnotthe equipmentontheCoveredList,asestablishedpursuantto§ 1.50002ofCFRTitle47,thatisprohibitedfrom obtaininganequipmentauthorizationunderthissubpart.Thisincludesequipmentthat: (1)Hasbeencertifiedasamodulartransmitter;or (2)Meetsthemodulartransmitterrequirementsof§ 15.212ofthischapterandcouldbecertifiedasamodular transmitter.pursuanttosection2.903resultingtherecentadoptionofFCC25-71(etal.,ETDocketNo.21-232, SecondReportandOrder);or (3)Uncrewedaircraftsystems(UAS)andUAScriticalcomponentsproducedinaforeigncountryandall communicationsandvideosurveillanceequipmentandserviceslistedinSection1709(a)(1)oftheFY25 NationalDefenseAuthorizationAct(Pub.L.118-159) ZhejiangLingzhuTechnologyCo.,Ltd.certifiesthat,asofthedateofthefilingoftheapplication,theapplicant [isnot]identifiedontheCoveredList(asaspecificallynamedentityoranyofitssubsidiariesoraffiliates)as anentityproducing“covered”equipment. ApplicantfurthercertifiesthatnoCybersecurityoranti-virussoftwareproducedorprovidedbyKasperskyLab, Inc.oranyofitssuccessorsandassignees,includingequipmentwithintegratedKasperskyLab,Inc.(oranyof itssuccessorsandassignees)cybersecurityoranti-virussoftwareisinstalledintheequipmentbeingcertified. Theabove-referencedCoveredListispublishedbythePublicSafetyandHomelandSecurityBureau (PSHSB),pursuanttoSection1.50002oftheCommission’srules. Sincerely, ________________________ Name:LinyunLi E-mail:[email protected]

1/1 ZhejiangLingzhuTechnologyCo.,Ltd. Date:April8,2026 FederalCommunicationsCommission AuthorizationandEvaluationDivision RE:CertificationApplication FCCID:2BEWX-TTFM-81G ToWhomItMayConcern, Pursuanttosections0.457and0.459ofCFR47,PublicNoticeDA04-1705oftheCommission’s policyandtoavoidprematurereleaseofsensitiveinformationpriortomarketingorreleaseofthe producttothepublic,theapplicantrequeststhefollowingdocumentscontainedinthiscertification applicationbetemporarilywithheldfrompublicdisclosureforaninitialperiodof180days: ExternalPhotos InternalPhotos Testset-upphotos UsersManual Theapplicationcontainstechnicalinformation,whichZhejiangLingzhuTechnologyCo.,Ltd. deemstobetradesecretsandproprietary.Ifmadepublic,theinformationmightbeusedtothe disadvantageoftheapplicantinthemarketplace. TheApplicantunderstandsthatpursuanttoRule0.457,disclosureofthisApplicationandall accompanyingdocumentationwillnotbemadebeforethedateoftheGrantforthisapplication Sincerely, ContactPerson:LinyunLi E-mail:[email protected]

Rev.1/1/03 ZhejiangLingzhuTechnologyCo.,Ltd. Date:April8,2026 FederalCommunicationsCommission AuthorizationandEvaluationDivision ConfidentialityRequestregardingapplicationforcertificationofFCCID:2BEWX-TTFM-81G PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestconfidential treatmentofinformationaccompanyingthisapplicationasoutlinedbelow: Schematics BlockDiagram OperationDescription TuneupProcedure Theabovematerialscontaintradesecretsandproprietaryinformationnotcustomarilyreleasedto thepublic.Thepublicdisclosureofthesematerialsmaybeharmfultotheapplicantandprovide unjustifiedbenefitstoitscompetitors. TheapplicantunderstandsthatpursuanttoSection0.457oftheRules,disclosureofthisapplication andallaccompanyingdocumentationwillnotbemadebeforethedateoftheGrantforthis application. Sincerely, ________________________ ContactPerson:LinyunLi E-mail:[email protected]

ZhejiangLingzhuTechnologyCo.,Ltd. Date:April8,2026 PowerofAttorney Towhomitmayconcern, PleasebenotifiedthatI,LinyunLi,havedesignatedJimTsaiinSportonInternationalInc. (Kunshan)asthepersonbeingresponsibleforthisprojectandtosigntheform731andother documentation. AnyandallactscarriedoutintheirprofessionalcapacitybySportonInternationalInc.(Kunshan) onthemattersofrelatingtoallprocessesrequiredintheFCCapprovalandanycommunication neededwiththenationalauthority,shallhavethesamelegalauthorityasactsonourownbehalf includingthereleaseofconfidentialinformation. Wefurthercertifiesthatneithertheapplicantnoranypartytothisapplication,asdefinedin47CFR Ch.1.2002(b),issubjecttoadenialtoFederalbenefits,thatincludeFCCbenefits,pursuantto section5301oftheAnti-DrugAbuseActof1998,21U.S.C.835(a). Thisauthorizationislimitedtotheproductofasfollowing: FCCID:2BEWX-TTFM-81G Ifyouhaveanyacknowledgementandresponse,pleasesendittoSportonInternationalInc. (Kunshan)directly. Shouldyouhaveanyquestionsorcommentsregardingthismatter,pleasehavemybestattention. Sincerelyyours, ContactPerson:LinyunLi E-mail:[email protected]

Sporton International Inc. (Kunshan) Page Number : 1 of 6 TEL : +86-512-57900158 Report Issued Date : Apr. 15, 2026 FCC ID : 2BEWX-TTFM-81G Report Version : Rev. 01 RF Exposure Evaluation Report Report No. : FA630302 RF Exposure Evaluation Report APPLICANT : Zhejiang Lingzhu Technology Co., Ltd. EQUIPMENT : Smart Sentry BRAND NAME : ofstar MODEL NAME : TTFM-81G FCC ID : 2BEWX-TTFM-81G STANDARD : 47 CFR PART 2.1093 FCC KDB 447498 D01 v06 The product evaluation date was started from Apr. 13, 2026 and completed on Apr. 13, 2026. We, Sporton International Inc. (Kunshan), would like to declare that the device has been evaluated in accordance with 47 CFR Part 2.1093 and FCC KDB 447498 D01 v06, and pass the limit. Without written approval of Sporton International Inc. (Kunshan), the test report shall not be reproduced except in full. Approved by: Si Zhang Sporton International Inc. (Kunshan) No. 1098, Pengxi North Road, Kunshan Economic Development Zone Jiangsu Province 215300 People’s Republic of China Sporton International Inc. (Kunshan) Page Number : 2 of 6 TEL : +86-512-57900158 Report Issued Date : Apr. 15, 2026 FCC ID : 2BEWX-TTFM-81G Report Version : Rev. 01 RF Exposure Evaluation Report Report No. : FA630302 Table of Contents 1. ADMINISTRATION DATA ........................................................................................................................... 4 1.1. Testing Laboratory ............................................................................................................................. 4 2. DESCRIPTION OF EQUIPMENT UNDER TEST (EUT) ............................................................................. 5 3. MAXIMUM RF TUNE UP POWER AMONG PRODUCTION UNITS .......................................................... 6 4. RF EXPOSURE EVALUATION ................................................................................................................... 6 Sporton International Inc. (Kunshan) Page Number : 3 of 6 TEL : +86-512-57900158 Report Issued Date : Apr. 15, 2026 FCC ID : 2BEWX-TTFM-81G Report Version : Rev. 01 RF Exposure Evaluation Report Report No. : FA630302 Revision History REPORT NO. VERSION DESCRIPTION ISSUED DATE FA630302 Rev. 01 Initial issue of report Apr. 15, 2026 Sporton International Inc. (Kunshan) Page Number : 4 of 6 TEL : +86-512-57900158 Report Issued Date : Apr. 15, 2026 FCC ID : 2BEWX-TTFM-81G Report Version : Rev. 01 RF Exposure Evaluation Report Report No. : FA630302 1. Administration Data 1.1. Testing Laboratory Sporton International Inc. (Kunshan) is accredited to ISO/IEC 17025:2017 by American Association for Laboratory Accreditation with Certificate Number 5145.02. Testing Laboratory Test Firm Sporton International Inc. (Kunshan) Test Site Location No. 1098, Pengxi North Road, Kunshan Economic Development Zone Jiangsu Province 215300 People’s Republic of China TEL : +86-512-57900158 Test Site No. Sporton Site No. FCC Designation No. FCC Test Firm Registration No. SAR01-KS CN1257 314309 Applicant Company Name Zhejiang Lingzhu Technology Co., Ltd. Address Room 302,No 1 Building Huace Center,Xihu District, Hangzhou City, Zhejiang Province,China Manufacturer Company Name Zhejiang Lingzhu Technology Co., Ltd. Address Room 302,No 1 Building Huace Center,Xihu District, Hangzhou City, Zhejiang Province,China Sporton International Inc. (Kunshan) Page Number : 5 of 6 TEL : +86-512-57900158 Report Issued Date : Apr. 15, 2026 FCC ID : 2BEWX-TTFM-81G Report Version : Rev. 01 RF Exposure Evaluation Report Report No. : FA630302 2. Description of Equipment Under Test (EUT) Product Feature & Specification EUT Type Smart Sentry Brand Name ofstar Model Name TTFM-81G FCC ID 2BEWX-TTFM-81G Wireless Technology and Frequency Range Bluetooth: 2402 MHz ~ 2480 MHz Mode Bluetooth LE Antenna Type Bluetooth : PCB Antenna Antenna Gain Bluetooth: gain 1.33 dBi EUT Stage Production Unit Remark: 1. The above EUT's information was declared by manufacturer. Please refer to the specifications or user's manual for more detailed description. Comments and Explanations: 1. The declared of product specification for EUT presented in the report are provided by the manufacturer, and the manufacturer takes all the responsibilities for the accuracy of product specification. 2. The maximum RF output tune up power, antenna gain also the safe distance used for evaluate RF exposure were declared by manufacturer. Sporton International Inc. (Kunshan) Page Number : 6 of 6 TEL : +86-512-57900158 Report Issued Date : Apr. 15, 2026 FCC ID : 2BEWX-TTFM-81G Report Version : Rev. 01 RF Exposure Evaluation Report Report No. : FA630302 3. Maximum RF Tune Up power among production units <Bluetooth> Mode Maximum Average Power (dBm) Bluetooth LE 2.0 4. RF Exposure Evaluation Mode Maximum Average Power (dBm) Bluetooth LE 2.0 Note: 1. Per KDB 447498 D01v06 the 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR  f(GHz) is the RF channel transmit frequency in GHz  Power and distance are rounded to the nearest mW and mm before calculation  The result is rounded to one decimal place for comparison Bluetooth Max Power (dBm) Separation Distance (mm) Frequency (GHz) exclusion thresholds 2.0 < 5 2.48 0.5 Conclusion: Per KDB 447498 D01v06, when the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. The test exclusion threshold is 0.5 which is ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, 1-g SAR and extremity SAR testing is not required, and complied with Specific Absorption Rate (SAR) for general population/uncontrolled exposure limits (1.6 W/kg for 1g SAR and 4.0 W/kg for extremity SAR) specified in FCC 47 CFR part 2 (2.1093). ------THE END------

Sporton International Inc. (Kunshan) Page Number : 1 of 40 TEL : +86-512-57900158 Report Issued Date : Apr. 13, 2026 FCC ID: 2BEWX-TTFM-81G Report Version : Rev. 01 Report Template No.: BU5-FR15CBT4.0 Version 2.0 FCC RF Test Report Report No. : FR630302 FCC RF Test Report APPLICANT : Zhejiang Lingzhu Technology Co., Ltd. EQUIPMENT : Smart Sentry BRAND NAME : ofstar MODEL NAME : TTFM-81G FCC ID : 2BEWX-TTFM-81G STANDARD : FCC Part 15 Subpart C §15.247 CLASSIFICATION : (DTS) Digital Transmission System TEST DATE(S) : Mar. 20, 2026 ~ Apr. 01, 2026 We, Sporton International Inc. (Kunshan), would like to declare that the tested sample has been evaluated in accordance with the test procedures and has been in compliance with the applicable technical standards. The test results in this report apply exclusively to the tested model / sample. Without written approval of Sporton International Inc. (Kunshan), the test report shall not be reproduced except in full. Approved by: Jason Jia Sporton International Inc. (Kunshan) No. 1098, Pengxi North Road, Kunshan Economic Development Zone Jiangsu Province 215300 People’s Republic of China Sporton International Inc. (Kunshan) Page Number : 2 of 40 TEL : +86-512-57900158 Report Issued Date : Apr. 13, 2026 FCC ID: 2BEWX-TTFM-81G Report Version : Rev. 01 Report Template No.: BU5-FR15CBT4.0 Version 2.0 FCC RF Test Report Report No. : FR630302 TABLE OF CONTENTS REVISION HISTORY .......................................................................................................................................... 3 SUMMARY OF TEST RESULT ......................................................................................................................... 4 1 GENERAL DESCRIPTION .......................................................................................................................... 5 1.1 Applicant ............................................................................................................................................ 5 1.2 Manufacturer ...................................................................................................................................... 5 1.3 Product Feature of Equipment Under Test ........................................................................................ 5 1.4 Product Specification of Equipment Under Test ................................................................................ 5 1.5 Modification of EUT ........................................................................................................................... 5 1.6 Testing Location ................................................................................................................................ 6 1.7 Test Software ..................................................................................................................................... 6 1.8 Applicable Standards ......................................................................................................................... 6 2 TEST CONFIGURATION OF EQUIPMENT UNDER TEST ........................................................................ 7 2.1 Carrier Frequency Channel ............................................................................................................... 7 2.2 Test Mode .......................................................................................................................................... 8 2.3 Connection Diagram of Test System ................................................................................................. 9 2.4 EUT Operation Test Setup ................................................................................................................ 9 2.5 Measurement Results Explanation Example ..................................................................................... 9 3 TEST RESULT .......................................................................................................................................... 10 3.1 6dB and 99% Bandwidth Measurement .......................................................................................... 10 3.2 Output Power Measurement ............................................................................................................ 17 3.3 Power Spectral Density Measurement ............................................................................................ 18 3.4 Conducted Band Edges and Spurious Emission Measurement ..................................................... 25 3.5 Radiated Band Edges and Spurious Emission Measurement ........................................................ 34 3.6 Antenna Requirements .................................................................................................................... 38 4 LIST OF MEASURING EQUIPMENT ........................................................................................................ 39 5 MEASUREMENT UNCERTAINTY ............................................................................................................ 40 APPENDIX A. CONDUCTED TEST RESULTS APPENDIX B. RADIATED SPURIOUS EMISSION APPENDIX C. DUTY CYCLE PLOTS APPENDIX D. SETUP PHOTOGRAPHS Sporton International Inc. (Kunshan) Page Number : 3 of 40 TEL : +86-512-57900158 Report Issued Date : Apr. 13, 2026 FCC ID: 2BEWX-TTFM-81G Report Version : Rev. 01 Report Template No.: BU5-FR15CBT4.0 Version 2.0 FCC RF Test Report Report No. : FR630302 REVISION HISTORY REPORT NO. VERSION DESCRIPTION ISSUED DATE FR630302 Rev. 01 Initial issue of report Apr. 13, 2026 Sporton International Inc. (Kunshan) Page Number : 4 of 40 TEL : +86-512-57900158 Report Issued Date : Apr. 13, 2026 FCC ID: 2BEWX-TTFM-81G Report Version : Rev. 01 Report Template No.: BU5-FR15CBT4.0 Version 2.0 FCC RF Test Report Report No. : FR630302 SUMMARY OF TEST RESULT Report Section FCC Rule Description Limit Result Remark 3.1 15.247(a)(2) 6dB Bandwidth ≥ 0.5MHz Pass - 3.1 - 99% Bandwidt…

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Antenna Specification Manufacture：TUYA Product Name：TTFM-81G Antenna Antenna Type：PCB Test Date：2025.6.15 Tested by：xuankong Approved by：Licco Content 1.General Description ................................................................................. 1 2.Test Configurations .................................................................................. 2 2.1 Test Environment ............................................................................ 2 2.2 Test Equipment ............................................................................... 2 2.3 Test Principle ................................................................................... 3 3.Test Results .............................................................................................. 3 3.1 Gain and Efficiency.......................................................................... 3 3.2 Radiation Pattern ............................................................................ 5 4.Antenna Dimensions ............................................................................... 6 5.EUT Photo.................................................................. 错误!未定义书签。 6.Test Setup Photo ........................................................ 错误!未定义书签。 1 1.General Description Manufacturer Hangzhou Tuya Information Technology Co.,Ltd Address Room 701,Building 3,More Center,No.87 GuDun Road, Hangzhou, Zhejiang,China Test Location Room 509, Building 1, No. 5 Zhiren Street, Binjiang District, Hangzhou Product Name TTFM-81G Antenna Product model TTFM-81G Antenna Type PCB Antenna Test Items Gain; Efficiency; Radiation Pattern Test Frequency 2400-2500MHz Test Standard ANSI/IEEE Std 149-1979 2 2.Test Configurations 2.1 Test Environment Temperature (°C) 25 Humidity (%RH) 60 Atmospheric Pressure (kPa) 100.5 2.2 Test Equipment Test System TEM 24 Multi-probe Microwave Chamber Test Instrument Agilent E5071B Instrument Calibration Date 2025/2/10 Due Date 2026/2/9 3 2.3 Test Principle 3.Test Results 3.1 Gain and Efficiency Frequency (MHz) Peak Gain (dBi) Efficiency (%) 2400 1.02 41.59 2410 0.75 45.5 2420 1.10 47.64 2430 1.05 44.77 2440 0.87 44.46 2450 0.83 43.25 2460 0.67 45.81 4 2470 1.02 41.88 2480 1.25 40.09 2490 1.33 39.99 2500 1.84 41.11 5 3.2 Radiation Pattern Phi 0 2D Phi 90 2D Theta 90 2D 6 2400MHz 3D 2450MHz 3D 2500MHz 3D