2BHGA-T28Wireless Headphones

V5.4+DER V5.4+DER V5.4+DER 双模蓝牙V5.4+EDR.超低功耗 左右耳均内置35mAh特殊定制可充 电聚合物锂电池 The left and right ears are built with 35mAh special custom chargingElectric polymer lithium battery Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. NOTE: This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. FCC Statement: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. RF exposure compliance statement: This device has been evaluated to meet the general RF exposure requirement

ShentesiTechnology(Shenzhen)Co.,Ltd Rev1/26/2023 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:2025-10-15 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:2BHGA-T28 ShentesiTechnology(Shenzhen)Co.,Ltd(“theapplicant”)certifiesthattheequipmentforwhich authorizationissoughtisnot“covered”equipmentprohibitedfromreceivinganequipment authorizationpursuanttosection2.903oftheFCCrules. ShentesiTechnology(Shenzhen)Co.,Ltd(“theapplicant”)certifiesthattheequipmentforwhich authorizationissoughtdoesnotincludecybersecurityoranti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofitssuccessorsandassignees,includingequipmentwithintegratedKaspersky Lab,Inc.(oranyofitssuccessorsandassignees)cybersecurityoranti-virussoftwarepursuanttoDA-24- 886andKDB986446D01CoveredEquipmentGuidancesectionB(2a). Deviceisinherentlycompliantbasedonhardwarelimitationsorsoftwarecontrols. or ASoftwareBillofMaterials(SBOM)isprovidedtotheTCBforreview,and Theend-userorthirdpartiescannotinstalladditionalsoftwareonthisdevice. Sincerely, (Applicantsignature) ContactName:hengxingzeng

ShentesiTechnology(Shenzhen)Co.,Ltd Rev1/26/2023 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:2025/10/15 Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:2BHGA-T28 ShentesiTechnology(Shenzhen)Co.,Ltd(“theapplicant”)certifiesthat,asofthedateofthefilingofthe application,theapplicantisnotidentifiedontheCoveredList(asaspecificallynamedentityoranyofits subsidiariesoraffiliates)asanentityproducing“covered” equipment. Sincerely, (Applicantsignature) ContactName:hengxingzeng

ShentesiTechnology(Shenzhen)Co.,Ltd Rev1/26/2023 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:2025/10/15 Ref:AttestationStatementsPart2.911(d)(7)Filing FCCIDorGranteeCode:FCCID:2BHGA-T28or2BHGA ApplicantFRN:0035660877 ShentesiTechnology(Shenzhen)Co.,Ltd(“theapplicant”)certifiesthat,asofthedateofthefilingofthe application,REPAmericaLLCisourdesignatedU.S.agentforserviceofprocessfortheabovereferenced FCCID.ShentesiTechnology(Shenzhen)Co.,Ltdacceptstomaintainanagentfornolessthanoneyear afterthegranteehasterminatedallmarketingandimportationortheconclusionofanyCommission- relatedproceedinginvolvingtheequipment. REPAmericaLLCaccepts,asofthedateofthefilingoftheapplication,theobligationofthedesignated U.S.agentforserviceofprocessfortheabovereferencedFCCID. DesignatedU.S.AgentInformation: Name:REPAmericaLLC S.AgentFRN:0034192500 Address:350TerrySt.200Longmont,CO80501UnitedStates ContactPerson:MrBenXu Tel.:(719)201-3314 Email:[email protected] Sincerely, hengxingzengMrBenXu ShentesiTechnology(Shenzhen)Co.,LtdREPAmericaLLC [InsertApplicantsignature][U.S.Agentsignature]

ShentesiTechnology(Shenzhen)Co.,Ltd Rev11/20/07 FederalCommunicationsCommission AuthorizationandEvaluationDivision ConfidentialityRequestregardingapplicationforcertificationofFCCID:2BHGA-T28. PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestconfidential treatmentofinformationaccompanyingthisapplicationasoutlinedbelow: ExhibitType Schematics Blockdiagram Operationdescription Theabovematerialscontaintradesecretsandproprietaryinformationnotcustomarilyreleasedto thepublic.Thepublicdisclosureofthesematerialsmaybeharmfultotheapplicantandprovide unjustifiedbenefitstoitscompetitors. TheapplicantunderstandsthatpursuanttoSection0.457oftheRules,disclosureofthis applicationandallaccompanyingdocumentationwillnotbemadebeforethedateoftheGrant forthisapplication. PursuanttoDA04-1705June15,2004oftheCommission’spublicnotice,wealsorequest temporaryconfidentialtreatmentofinformationaccompanyingthisapplicationasoutlinedbelow: ExhibitType Sincerely, (signature) hengxingzeng

ShentesiTechnology(Shenzhen)Co.,Ltd M:\MasterDocuments\TEMPLATES\POA_Letter.doc FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Date:2025/10/15 SUBJECT:FCCApplicationforFCCID:2BHGA-T28 ToWhomItMayConcern: We,theundersigned,herebyauthorizeMachaelMoatShenzhenDACETesting TechnologyCo.,Ltd.onourbehalf,toapplytotheFederalCommunicationsCommission onourequipment.AnyandallactscarriedoutbyShenzhenDACETestingTechnology Co.,Ltd.onourbehalfshallhavethesameeffectasactsofourown. ThisistoadvisethatweareinfullcompliancewiththeAnti-DrugAbuseAct.We,the applicant,arenotsubjecttoadenialoffederalbenefitspursuanttoSection5301ofthe Anti-DrugActof1988,21USC853a,andnopartytotheapplicationissubjecttoadenial offederalbenefitspursuanttothatsection. Regards, (signature) hengxingzeng

FCCID:2BHGA-T28 External FCCID:2BHGA-T28 FCCID:2BHGA-T28 FCCID:2BHGA-T28 FCCID:2BHGA-T28

LabelLocation: Label:5*10mm FCCID:2BHGA-T28

FCCID:2BHGA-T28 Internal FCCID:2BHGA-T28 FCCID:2BHGA-T28

Page1of1 RFExposureEvaluationReport 1RFEXPOSURE ProductName: WirelessHeadphones ModelNo: T28 FCCID:2BHGA-T28 NOTE:accordingtoKDB447498D01GeneralRFExposureGuidancev06 ， Unlessspecifically requiredbythepublishedRFexposureKDBprocedures,standalone1-gheadorbodyand10-g extremitySARevaluationforgeneralpopulationexposureconditions,bymeasurementornumerical simulation,isnotrequiredwhenthecorrespondingSARTestExclusionThresholdcondition(s), listedbelow,is(are)satisfied. For100MHzto6GHzandtestseparationdistances≤50mm,the1-gand10-gSARtest exclusionthresholdsaredeterminedbythefollowing: TheEUTisaportabledevice [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistance, mm)]·[√f(GHz)]≤3.0for1-gSAR,and≤7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison Theproductisusedatadistanceof5mmfromthehumanbody. Here, 1.1EUTRFEXPOSUREEVALUATION OperationalMode:3DH5 Channel (MHz) MaximumPeak Conducted OutputPower (dBm) Tuneup tolerance (dB) Maximum tune-up Power (dBm) Maximum tune-up Power (mW) Calculated value Exclusion threshold 24808.45 8±1 97.9432.4623 Conclusion:thecalculatedvalue≤3.0,SARisexempted.

Antenna test report RCX RF E nginee 2025.08.18 r Wang Jiaxi Stru ctural engineer Zhou Lei Freq uenc y band 2402~2480MHz Shentesi Technology (Shenzhen) Co., Ltd 1 LOSS/SWR 2 无源测试数据 3 Frequency ID1 2 3 4 5 6 7 8 9 10 11 Frequency (MHz)2400.02410.02420.02430.02440.02450.02460.02470.02480.02490.02500.0 Efficiency (dBi)-8.42-8.38-8.34-8.53-8.62-8.77-8.84-8.85-8.79-9.20-9.53 Gain (dBi)-3.45-3.48-3.46-3.64-3.69-3.76-3.88-4.12-4.36-4.91-5.01 Efficiency (%)14.3914.5314.6614.0213.7313.2813.0813.0413.2012.0311.15 Directivity (dB)4.974.894.884.904.935.014.964.724.434.294.52 Peak Gain Position (Theta)98.0098.0098.0098.0098.0098.0098.0098.0098.0097.0097.00 Peak Gain Position (Phi)332.00333.00333.00332.00333.00334.00337.00338.00338.00336.00333.00 Efficiency ThetaPol (%)10.9711.1111.1910.7210.4610.099.979.739.698.738.28 Efficiency PhiPol (%)3.423.423.473.293.273.193.113.303.523.292.87 Upper Hem. Efficiency (%)7.297.477.607.307.176.896.646.506.545.925.52 Lower Hem. Efficiency (%)7.107.067.056.716.566.396.446.546.666.115.63 VER7 T90(H) 圆度 8.879.379.8510.069.689.369.038.858.458.158.95 Gain 15deg (dBi) E1(XZ) 波瓣宽度 80.0079.0079.0080.0081.0080.0074.0071.0070.0071.0079.00 E1(XZ) 前后比 1.471.751.781.411.111.251.962.242.231.851.65 E2(YZ) 波瓣宽度 44.0044.0044.0045.0045.0046.0069.0073.0072.0070.0053.00 E2(YZ) 前后比 3.844.274.514.033.563.052.301.962.112.322.44 最大增益处轴比 (P)20.9224.3120.9917.0414.1012.929.819.9710.5511.4514.22 仰角 10 度最差 ( 大 ) 轴比 (P)52.2051.9251.4851.2548.9846.3550.7741.2053.1341.5852.96 Hc(XY) 波瓣宽度 90.0095.0099.0099.0092.0085.0082.0086.00110.00128.00117.00 Hc(XY) 前后比 1.321.321.261.281.531.902.082.001.631.371.32 左旋圆极化效率 (%)6.606.666.846.666.656.426.106.096.195.615.74 右旋圆极化效率 (%)7.787.877.827.357.086.866.986.957.016.425.41 Empty 4 Peak Gain 4 Frequency ID1 Frequency (MHz) 2402-2480 Efficiency (dBi)-8.42 Gain (dBi)-3.45 Efficiency (%)14.39 Directivity (dB)4.97 Peak Gain Position (Theta)98.00 Peak Gain Position (Phi)332.00 Efficiency ThetaPol (%)10.97 Efficiency PhiPol(%)3.42 Upper Hem. Efficiency (%)7.29 Lower Hem. Efficiency (%)7.10

V1.0ReportNo.:DACE250909002RF001 102,BuildingH1,&1/F.,BuildingH,HongfaScience&TechnologyPark,TangtouCommunity,ShiyanSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China Web:http://www.dace-lab.comTel:+86-755-23010613E-mail:[email protected] 1 of 88 RFTESTREPORT For ShentesiTechnology(Shenzhen)Co.,Ltd ProductName:WirelessHeadphones TestModel(s):T28 ReportReferenceNo.:DACE250909002RF001 FCCID:2BHGA-T28 Applicant’sName:ShentesiTechnology(Shenzhen)Co.,Ltd Address: 101,SouthBuilding,Block3,TanTouIndustrialCity,TanTouCommunity, SongGangStreet,Bao'anDistrict,Shenzhen TestingLaboratory:ShenzhenDACETestingTechnologyCo.,Ltd. Address: 102,BuildingH1,&1/F.,BuildingH,HongfaScience&TechnologyPark, TangtouCommunity,ShiyanSubdistrict,Bao'anDistrict,Shenzhen, Guangdong,China TestSpecificationStandard:47CFRPart15.247 DateofReceipt:September9,2025 DateofTest:September9,2025toSeptember11,2025 DataofIssue:September11,2025 Result:Pass Note:Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofShenzhenDACE TestingTechnologyCo.,Ltd.ThisdocumentmaybealteredorrevisedbyShenzhenDACETestingTechnology Co.,Ltd.personnelonly,andshallbenotedintherevisionsectionofthedocument.Thetestresultsinthe reportonlyapplytothetestedsample V1.0ReportNo.:DACE250909002RF001 102,BuildingH1,&1/F.,BuildingH,HongfaScience&TechnologyPark,TangtouCommunity,ShiyanSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China Web:http://www.dace-lab.comTel:+86-755-23010613E-mail:[email protected] 2 of 88 Applyforcompanyinformation Applicant’sName:ShentesiTechnology(Shenzhen)Co.,Ltd Address:101,SouthBuilding,Block3,TanTouIndustrialCity,TanTou Community,SongGangStreet,Bao'anDistrict,Shenzhen ProductName:WirelessHeadphones TestModel(s):T28 SeriesModel(s):N/A TestSpecificationStandard(s):47CFRPart15.247 NOTE1: Themanufacturershouldensurethatallproductsinseriesproductionareinconformitywiththeproductsampledetailedin thisreport.Iftheproductinthisreportisusedinanyconfigurationotherthanthatdetailedinthereport,themanufacturer mustensurethenewsystemcomplieswithallrelevantstandards. Compiledby: Supervisedby:Approvedby: KerenHuang/TestEngineerBenTang/ProjectEngineerTomChen/Manager September11,2025September11,2025September11,2025 V1.0ReportNo.:DACE250909002RF001 102,BuildingH1,&1/F.,BuildingH,HongfaScience&TechnologyPark,TangtouCommunity,ShiyanSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China Web:http://www.dace-lab.comTel:+86-755-23010613E-mail:[email protected] 3 of 88 RevisionHistoryOfReport VersionDescriptionREPORTNo.IssueDate V1.0OriginalDACE250909002RF001September11,2025 V1.0ReportNo.:DACE250909002RF001 102,BuildingH1,&1/F.,BuildingH,HongfaScience&TechnologyPark,TangtouCommunity,ShiyanSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China Web:http://www.dace-lab.comTel:+86-755-23010613E-mail:[email protected] 4 of 88 CONTENTS 1TESTSUMMARY...................................................................................................................................................6 1.1TESTSTANDARDS........................................................................................................................................6 1.2SUMMARYOFTESTRESULT.........................................................................................................................6 2GENERALINFORMATION....................................................................................................................................7 2.1CLIENTINFORMATION..................................................................................................................................7 2.2DESCRIPTIONOFDEVICE(EUT)..................................................................................................................7 2.3DESCRIPTIONOFTESTMODES....................................................................................................................8 2.4DESCRIPTIONOFSUPPORTUNITS................................................................................................................8 2.5EQUIPMENTSUSEDDURINGTHETEST........................................................................................................9 2.6STATEMENTOFTHEMEASUREMENTUNCERTAINTY....................................................................................11 2.7IDENTIFICATIONOFTESTINGLABORATORY.................................................................................................11 2.8ANNOUNCEMENT........................................................................................................................................11 3EVALUATIONRESULTS(EVALUATION)...........................................................................................................12 3.1ANTENNAREQUIREMENT............................................................................................................................12 3.1.1Conclusion:.................................................................................................................................12 4RADIOSPECTRUMMATTERTESTRESULTS(RF).........................................................................................13 4.1CONDUCTEDEMISSIONATACPOWERLINE................................................................................................13 4.1.1E.U.T.Operation:........................................................................................................................13 4.1.2TestSetupDiagram:...................................................................................................................13 4.1.3TestData:...................................................................................................................................14 4.220DBBANDWIDTH.....................................................................................................................................16 4.2.1E.U.T.Operation:................................................................................................................…

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FCCID:2BHGA-T28 ConductedEmissionatACpowerline Emissionsinfrequencybands(below1GHz) FCCID:2BHGA-T28 Emissionsinfrequencybands(above1GHz)