2BTYH-SY-48SMD-T4Iridescent ambient light

GuangzhoushuangyuanElechnologyCO.,LTD Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity AttestationStatements NotCoveredEntityApplicant&NotCoveredEquipment To:FederalCommunicationsCommissionDate:Jan.7,26 7435OaklandMillsRoad, Columbia,MD21046,USA Ref:InformationRequiredbySection2.911(d)(5)(i)&(ii) FCCID:2BTYH-SY-48SMD-T4 GuangzhoushuangyuanElechnologyCO.,LTD(“theapplicant”)certifiesthat,asofthedateofthe filingoftheapplication,theapplicantisnotidentifiedontheCoveredList,establishedpursuantto§ 1.50002ofreferencechapter,asanentityproducing“covered”communicationequipment.The equipmentforwhichauthorizationissoughtisnot“covered”telecommunicationsequipmentandvideo surveillanceequipmentproducedbyentitiesidentifiedontheCommission’sCoveredListthatprohibited fromreceivinganequipmentauthorizationpursuanttosection§2.903oftheFCCrules. Sincerelyyours, ApplicantSignature PrintedName:ZequnYu Title:Manager Address:Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity Tel.:18819818650 Email:[email protected]

GuangzhoushuangyuanElechnologyCO.,LTD Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity 1|Page AttestationStatements To:FederalCommunicationsCommissionDate:Jan.7,26 7435OaklandMillsRoad, Columbia,MD21046,USA Subject:AttestationofCompliancewithFCCCoveredListSoftwareRequirements FCCID:[2BTYH-SY-48SMD-T4] ProductName:[Iridescentambientlight] Thisletterservesasanattestationthattheequipmentidentifiedabove☐is/☒isnot(selectone)"covered" softwareasdefinedundertheFederalCommunicationsCommission(FCC)CoveredListrequirements,as outlinedinFCC22-84andKDB986446. Specifically,theundersignedcertifiesthattheequipmentforwhichauthorizationissought: 1.Doesnotcontaincybersecurityoranti-virussoftwareproducedorprovidedbyKasperskyLab, Inc.oranyofitssuccessors,assignees,parents,subsidiaries,affiliates,oranyentitythathasrebranded orrelabeledsoftwareproducedbytheaforementionedentities. 2.Doesnothavethecapabilitytostore,run,ordeliveranysoftwareidentifiedontheFCCCoveredList, includingbutnotlimitedtocybersecurityandanti-virussoftware. Tosupportthisattestation,theappendixevaluationdocumentationhasbeenpreparedandisincludedinthe certificationfiling. Thisattestationisbasedonathoroughevaluationofthedevice'sdesign,functionality,andsoftware environment.Theundersignedaffirmsthattheinformationprovidedisaccurateandcompletetothebestof theirknowledge. Sincerelyyours, ApplicantSignature PrintedName:ZequnYu Title:Manager Address:Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity Tel.:18819818650 Email:[email protected] GuangzhoushuangyuanElechnologyCO.,LTD Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity 2|Page EvaluationregardingtotheCoveredListSoftware: Compliance Methodology EvaluationProcessResults Deviceis Inherent compliance ☒ TheChipset(s)usedislimitedtorun theCybersecurityoranti-virus software. Compliance ☒ TheMemoryusedislimitedtorunthe Cybersecurityoranti-virussoftware. Compliance ☒ Thereisstoragecapacitylimitationfor storeorinstalltheCybersecurityor anti-virussoftware. Compliance ☒ Operatingsystemusedislimitedto run,installordelivertheCybersecurity oranti-virussoftware. Compliance Deviceisnot Inherent compliance ☐ EvaluationBasedonSoftware BillofMaterials(SBoM) ☐ EvaluationBasedonScanfor Softwareonthedevice ☐ EvaluationBasedonFilesystemscan ☐ EvaluationBasedonRunning softwarecheck

Guang zhou shuang yuan Elechnology CO.,LTD Room 401, 4th Floor, No. 22, Yongping Hongxing Road, Yongping Street, Baiyun District, Guangzhou City US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: Bridgeport Advisory LLC FRN: 0037566148 Contact Name: Yong Liu Address: 3330 W 38TH PL, CHICAGO, IL 60632, United States Telephone No: +1 (708) 680-6688 Email: [email protected] Applicant: Company name:Guang zhou shuang yuan Elechnology CO.,LTD Product Description: Iridescent ambient light Grantee code:2BTYH FCC ID:2BTYH-SY-48SMD-T4 Contact Name:Zequn Yu Address:Room 401, 4th Floor, No. 22, Yongping Hongxing Road, Yongping Street, Baiyun District, Guangzhou City Telephone No:18819818650 Email:[email protected] FRN: 0037801990 [Guang zhou shuang yuan Elechnology CO.,LTD] certifies that, as of the date of this filing of the application with the TCB, [Bridgeport Advisory LLC] is our designated US agent for service of process for the above referenced FCC ID. [Guang zhou shuang yuan Elechnology CO.,LTD] accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any commission related proceeding involving equipment. [Bridgeport Advisory LLC]] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Date: 2026/1/4 Applicant’s Name: Zequn Yu US Agent’s Name: Yong Liu Title: Manager Title: Managing Member Signature Signature 1/1

GuangzhoushuangyuanElechnologyCO.,LTD Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity 1/7/2026 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:ConfidentialityRequestfor:FCCID:2BTYH-SY-48SMD-T4 PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestpermanent confidentialtreatmentoftheexhibitsaccompanyingthiscertificationapplicationasoutlinedbelow: BlockDiagram  Schematics OperationalDescription Theaboveexhibitscontaintradesecretsand/orproprietaryinformationthatarenotpubliclyavailableand materialsthattheApplicanthasspentconsiderableeffortsindeveloping.Publicdisclosureofthesemay beharmfultotheApplicantandgiveanunfairadvantagetocompetitorsonthemarket. Sincerely, (Signature) PrintedName:ZequnYu Title:Manager Address:Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity Tel.:18819818650 Email:[email protected]

GuangzhoushuangyuanElechnologyCO.,LTD Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity Date:Jan.7,26 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:AgentAuthorizationforFCCID:2BTYH-SY-48SMD-T4 I,theundersigned,herebyauthorize(CTSLTesting(Dongguan）Co.,Ltd.)toactonourbehalfinall mattersrelatingtothisapplicationforequipmentcertification. Anyactcarriedoutby(CTSLTesting(Dongguan）Co.,Ltd.)shallhavethesameeffectasourownandI acknowledgethatallresponsibilityforcomplyingwiththetermsandconditionsofcertification,as specifiedbyDERYCOMCERTIFICATIONSERVICES,INC.,stillresideswith(Guangzhoushuangyuan ElechnologyCO.,LTD). WecertifythatwearenotsubjecttoadenialoffederalbenefitsthatincludesFCCbenefitspursuantto Section5301oftheAnti-DrugAbuseActof1988,21U.S.C.§862,andthatnopartytotheapplication,as definedin47CFR§1.2002(b),issubjecttoadenialoffederalbenefitsthatincludesFCCbenefits pursuanttothatsection. Sincerely, ApplicantSignature: PrintedName:ZequnYu Title:Manager Address:Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet,BaiyunDistrict, GuangzhouCity Tel.:18819818650 Email:[email protected]

GuangzhoushuangyuanElechnologyCO.,LTD ProductSimilarityDeclaration EUTDescription:Iridescentambientlight ModelNo.:SY-48SMD-T4 FCCID:2BTYH-SY-48SMD-T4 We(GuangzhoushuangyuanElechnologyCO.,LTD)hereby statethatallthemodelsareelectricalidenticalincludingthesame softwareparameterandhardwaredesign(i.e.,circuitdesign,PCB Layout,RFmodule/circuit,antennatype(s)andantennalocation, componentsonPCB,etc.,),samemechanicalstructureand design(includingproductenclosure,materials,etc.,),theonly differenceisthemodelnameandcolour. Signature: Name:ZequnYu Title:Manager Place,date:Jan.8,2026

Page1of4 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexA. EUTExternalPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com AnnexA. EUTExternalPhotos Photo1ExternalphotosofEUT Photo2ExternalphotosofEUT Page2of4 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexA. EUTExternalPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo3ExternalphotosofEUT Photo4ExternalphotosofEUT Page3of4 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexA. EUTExternalPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo5ExternalphotosofEUT Photo6ExternalphotosofEUT Page4of4 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexA. EUTExternalPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo7ExternalphotosofEUT ------------------------------------------EndofEUTExternalPhotos------------------------------------------

LabelandLabelLocation FCCID:2BTYH-SY-48SMD-T4 L*W:10mm*5mm labelandWhitefont

Page1of2 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexB. EUTInternalPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com AnnexB. EUTInternalPhotos Photo1InternalphotosofEUT Photo2InternalphotosofEUT Page2of2 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexB. EUTInternalPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo3InternalphotosofEUT ------------------------------------------EndofEUTInternalPhotos------------------------------------------ Antennaposition

Page1of1 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER RFExposure Evaluation FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com RFExposureEvaluation EUTDescription:Iridescentambientlightremotecontrol ModelNo.:SY-48SMD-T4 FCCID:2BTYH-SY-48SMD-T4 Equipmenttype:Portabledevices AccordingtoKDB447498D01GeneralRFExposureGuidancev06andpart2.1093，Unlessspecificallyrequired bythepublishedRFexposureKDBprocedures,standalone1-gheadorbodyand10-gextremitySARevaluation forgeneralpopulationexposureconditions,bymeasurementornumericasimulation,isnotrequiredwhenthe correspondingSARTestExclusionThresholocondition(s),listedbelow,is(are)satisfied. For100MHzto6GHzandtestseparationdistances<50mm,the1-gand10-gSARtestexclusionthresholdsare determinedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistancemm)]·[vfGHz)]<3.0for 1-gSAR,ands7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison Conclusion:So,SARtestisnotrequired --------------------------------------EndofRFExposureEvaluation-------------------------------------- conducted power (dBm) Max tune-up(mW) Frequency(MHz)Min. distance(mm) Calc. thresholds limit 1.88 1.5417240250.47793.0 0.27 1.0641244050.33243.0 0.55 1.1350248050.35713.0

1.ElectricalCharacteristics ItemSpecification Manufacturer ShenzhenTaiYilinanScienc e&TechnologyCo.,Ltd TypePCBMeanderLineAntenna Centralfrequency2.441GHz Bandwidth78MHz(Typicalvalue) Gain1dBi PolarizationLinear VSWR2max. AzimuthBandwithOmni-directional Impedance50Ω RatedPower(max.)4dBm MaximumInputPower10dBm OperationTemperature-40C~+85C 2.Thesuggestionofmatchingcircuit 3.TheMeasurementofS-ParameterandVSWR Frequency(GHz)S11(dB) 2.402-10.24 2.441-24.02 2.480-10.74 Frequency(GHz)VSWR 2.4021.88 2.4411.13 2.4801.81 Thereference: ReturnLoss -6.02dB-7.36dB-10dB-13dB-20dB VSWR 32.51.921.5761.22 ReturnPowerRatio 25%18.37%10%5%0.98%

Page1of45 FCCPART15SUBPARTC FCCPART15.247 TESTREPORT FCCID:2BTYH-SY-48SMD-T4 ReportNo:CTSL2521220073ER ProductName:Iridescentambientlight MainTestModel:SY-48SMD-T4 SeriesModels: SY-48SMD-T4+1,SY-48SMD-T2+2, SY-48SMD-T2+2+1,SY-72SMD+T4,SY-72SMD-T4+1, SY-72SMD-T2+2,SY-72SMD-T2+2+1,SY-J3-T4,SY-D4 -T2+2,SY-RXD-30CM,SY-RXD-45CM,SY-RXD-60CM, SY-RXD-85CM,SY-APP-KZQ(Thedifferencesbetween modelsarelimitedtothefronttrimpanel,housingcolor, knobandbuttoncolors,speakercolor,andlightring configuration,Noimpactonelectricalperformanceand RFcircuits) Applicant:GuangzhoushuangyuanElechnologyCO.,LTD EXECUTIVESUMMARY Asampleofthisproductwastestedandfoundtobeincompliancewith FCCPART15C,FCCPART15SUBPARTC(15.247). Anyreproductionofthisdocumentmustbedoneinfull.Nosinglepartofthisdocumentmay bereproducedwithoutpermissionfromCTSL.AllTestDataPresentedinthisreportisonly applicabletopresentedTestsample. CTSLTesting(Dongguan)Co.,Ltd. Maincompanyaddress:HexingBuilding,HoujieAvenue,HoujieRoadHoujieTown, GuangdongProvinceDongguanCity,People’sRepublicofChina Page2of45 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com TestReport FCCID:2BTYH-SY-48SMD-T4 Applicant Name GuangzhoushuangyuanElechnologyCO.,LTD Applicant Address Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet, BaiyunDistrict,GuangzhouCity Manufacturer Name GuangzhoushuangyuanElechnologyCO.,LTD Manufacturer Address Room401,4thFloor,No.22,YongpingHongxingRoad,YongpingStreet, BaiyunDistrict,GuangzhouCity TradeMarku-microstar ProductnameIridescentambientlight MainTest Model SY-48SMD-T4 SeriesModelsSeethefirstpageofthereport Standard FCCPart15SubpartC(15.247) ANSIC63.10:2020 FCCKDB558074D0115.247MeasGuidancev05r02 TestLocation ISO/IEC17025byILAC-MRAisA2LA7556.01 CTSLTesting(Dongguan)Co.,Ltd. Room112,Building1,No.15,JiaoyuansongshanHetianVillage,HoujieTown DongguanCity,Guangdong,People’sRepublicofChina ReceiptDate2025.12.12Testperiod2025.12.12-2025.12.26IssueDate2025.12.26 Conclusion Theequipmentundertestwasfoundtobecompliancewiththe requirementsofthestandardsapplied. Performs Testing: EthanZhao TestReport Reviewer: SteveQin TestReport Authorizer: AlanLi Page3of45 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com TABLEOFCONTENTS DescriptionPage TESTREPORTVERIFICATION ...................................................................................................................... 3 1.GENERALINFORMATION........................................................................................................................5 1.1.GeneralDescriptionofEUT(EquipmentUnderTest).......................................................................5 1.2.AntennaInformation................................................................................................................................6 1.3.InformationofRFCable..........................................................................................................................6 2.SUMMARYOFTEST................................................................................................................................7 2.1.TestStandards.........................................................................................................................................7 2.2.Summaryoftestresult............................................................................................................................7 2.3.TestFacilities............................................................................................................................................8 2.4.Measurementuncertainty.......................................................................................................................9 2.5.BlockDiagram........................................................................................................................................10 2.6.Assistantequipmentusedfortest.......................................................................................................10 2.7.ChannelList............................................................................................................................................11 2.8.PowerSettingofTestSoftware...........................................................................................................11 2.9.TestEquipment......................................................................................................................................12 3.6DBBANDWIDTH.............................................................................................................................14 3.1.Limit..........................................................................................................................................................14 3.2.TestSetup...............................................................................................................................................14 3.3.SpectrumAnalyzerSetting...................................................................................................................14 3.4.TestProcedure.......................................................................................................................................14 3.5.TestResult..............................................................................................................................................15 3.6.OriginalTestrecord...............................................................................................................................16 4.99%BANDWIDTH.................................................................................................................................17 4.1.Limit...........…

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Page1of2 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexC. TestSetupPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com AnnexC. TestSetupPhotos Photo1TestSetupPhotosofRadiatedEmissionTest(30-1000MHz) Photo2TestSetupPhotosofRadiatedEmissionTest(Above1GHz) Page2of2 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220073ER AnnexC. TestSetupPhotos FCCID:2BTYH-SY-48SMD-T4 Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo4TestSetupPhotosofACPowerLineConductedEmissions ------------------------------------------EndofTestSetupPhotos------------------------------------------