2BUZB-GD31wireless earphones

GD31 GD31 FCC Statement Changes ormodifications notexpressly approved by the party responsible for compliance could voidtheuser ' s authority to operate theequipment . 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 thedealeroranexperienced radio/ TV technician for help Thisdevicecomplieswithpart15 of theFCC rules . Operationis subjectto thefollowingtwo conditions ( 1 ) this device may not cause harmful interference , and ( 2 ) this device must accept any interferencereceived , includinginterference that may cause undesired operation. The device has been evaluated to meet gen eral RF exposure requirement. The device ca n be used in portable exposure condition with out restriction. wireless earphones

LocalRepresentativeLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(7),oftheCommission’sRules(47C.F.R.)weattestasfollowsfor theproductlistedbelow: FCCIDModelname 2BUZB-GD31GD31 Weherebyacknowledgeasfollows: i.bothsigneesconfirmthatthepointofcontactacceptsresponsibilitytoactasaUS- AmericanRepresentativeonbehalfoftheapplicant ii.thepointofcontactprovidesthephysicalU.S.addressandemailaslistedbelow iii.bothpartiesmaintaintherequirementsofthisagreementwithoutexpirationdate US-AmericanPointofContactApplicant/ApprovalHolder SignatureSignature CompanyName:GlobalProductServicesand ConsultationLLC ShenzhenDewanghong TechnologyCo.LTD FRN:00334067030038090999 ContactName:MrMichaelChanShengQin Address:328WPalmAve.Monrovia,CA 91016,UnitedStates 6/F,BuildingB5,AnleIndustrial Zone,HangchengAvenue,Gushu, Xixiang,Baoan DistrictShenzhen,China Phone:(626)366-4358N/A Email:[email protected]@cis-cn.net

CoveredEquipmentAttestationLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(5)(i)-(ii)oftheCommission’sRules(47C.F.R.)weattestas followsfortheproductlistedbelow: FCCIDModelname 2BUZB-GD31GD31 We, Applicant CompanyName:ShenzhenDewanghongTechnologyCo.LTD Address:6/F,BuildingB5,AnleIndustrial Zone,HangchengAvenue,Gushu,Xixiang, BaoanDistrictShenzhen,China Phone:N/A certifythattheequipmentforwhichauthorizationissoughtisnot“covered”equipment prohibitedfromreceivinganequipmentauthorizationpursuanttosection2.903oftheFCC rules.Thisincludesthecybersecurityandanti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofistsuccessorsandassignees. Wecertifythat,asofthedateofthefilingoftheapplication,theapplicantisnotidentified ontheCoveredListasanentityproducing“covered”equipment. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-03-27 SignatureDate PrintedNameofSignee:ShengQin Company:ShenzhenWIONDTechnologyCo., Ltd Phone:+8614776020723 Email:[email protected] Address:6/F,BuildingB5,AnleIndustrial Zone,HangchengAvenue,Gushu,Xixiang, BaoanDistrictShenzhen,China Fax:N/A

ConfidentialityRequestLetter ForCertificationServiceintheUSA FederalCommunicationCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoParagraphs§0.457and0.459oftheCommission’sRules(47C.F.R.)andSection §552(b)(4)oftheFreedomofInformationAct,werequestconfidentialityforthe documentationofthefollowingproducts: FCCIDModelname 2BUZB-GD31GD31 Fortheproductslistedabove,werequestpermanentconfidentialityforallapplicable exhibitsasthereare:  theOperationalDescription  theBlockDiagram theSchematics Theabovelistedexhibitscontaintradesecretsandproprietaryinformationthatcouldbeof benefittoourcompetitors. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-03-27 SignatureDate PrintedNameofSignee/Title:ShengQin/Manager Company:ShenzhenDewanghongTechnologyCo.LTD Address:6/F,BuildingB5,AnleIndustrialZone,Hangcheng Avenue,Gushu,Xixiang,BaoanDistrictShenzhen,China Phone:+8614776020723 Fax:-- Email:[email protected]

ReportNo.:CISRR26031815201 Page 60 of 63 9.EXTERNALANDINTERNALPHOTOS 9.1.ExternalPhotos ReportNo.:CISRR26031815201 Page 61 of 63

Size:10mm*5 Label mm FCC ID:2BUZB-GD31 Label Location

ReportNo.:CISRR26031815201 Page 62 of 63 9.2.InternalPhotos ANT ReportNo.:CISRR26031815201 Page 63 of 63 ------Endofthereport-----

ReportNo.:CISRR26031815202 Reporttemplateversion:CISE-TR-001-A0Page:1of5 TESTREPORT RFExposureEvaluation ReportNo.CISRR26031815202 ProjectNo.CISR260318152 FCCID2BUZB-GD31 ApplicantShenzhenDewanghongTechnologyCo.LTD Address 6/F,BuildingB5,AnleIndustrialZone,HangchengAvenue,Gushu, Xixiang,BaoanDistrictShenzhen,China ManufacturerShenzhenDewanghongTechnologyCo.LTD Address 6/F,BuildingB5,AnleIndustrialZone,HangchengAvenue,Gushu, Xixiang,BaoanDistrictShenzhen,China ProductNamewirelessearphones Trademark- Model/TypereferenceGD31 ListedModel(s)- Standard 47CFRPart2.1093 DateofsamplereceiptMarch19,2026 TestdateMarch19,2026toMarch25,2026 IssuedateMarch25,2026 TestresultComplied Reviewedby:LucasHuang Approvedby:HansHu Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangceTesting TechnologyCo.,Ltd. ReportNo.:CISRR26031815202 Reporttemplateversion:CISE-TR-001-A0Page:2of5 1.APPLICABLESTANDARD 47CFRPart2.1093:Radiofrequencyradiationexposureevaluation:portabledevices ANSIC95.1–3999:IEEEStandardforSafetyLevelswithRespecttoHumanExposuretoRadioFrequency ElectromagneticFields,3kHzto300GHz. FCCKDBpublication447498D01GeneralRFExposureGuidancev06:MobileandPortableDevicesRF ExposureProceduresandEquipmentAuthorizationPolicies. 47CFRPart1.1307:Actionsthatmayhaveasignificantenvironmentaleffect,forwhichEnvironmental Assessments(EAs)mustbeprepared. 2.REPORTVERSION VersionNo.IssuedateDescription 00March25,2026Original ReportNo.:CISRR26031815202 Reporttemplateversion:CISE-TR-001-A0Page:3of5 3.RADIOSPECIFICATIONDESCRIPTION Bluetooth Supportedtype:BREDRLE-1Mbps LE-2Mbps Note:PleaserefertoRFreportfordetailedtechnicalspecifications 4.SIMULTANEOUSTRANSMISSIONANALYSIS ThedeviceuseasingletransmittermoduleandantennaforBluetooth,cannottransmitsimultaneously. ReportNo.:CISRR26031815202 Reporttemplateversion:CISE-TR-001-A0Page:4of5 5.TESTRESULT 5.1.Standalonetransmission Limit: KDB447498D01v06,Clause4.3.1a) For100MHzto6GHzandtestseparationdistances≤50mm,the1-gand10-g SARtestexclusionthresholdsaredeterminedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]*[√f(GHz)]≤3.0for1-gSAR,and≤7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation31The resultisroundedtoonedecimalplaceforcomparison Thevalues3.0and7.5arereferredtoasnumericthresholdsinstepb)below Thetestexclusionsareapplicableonlywhentheminimumtestseparationdistanceis≤50mm, andfortransmissionfrequenciesbetween100MHzand6GHz.Whentheminimumtest separationdistanceis<5mm,adistanceof5mmaccordingto4.1f)isappliedtodetermine SARtestexclusion. Result: Passed TestData Radiotype Frequency (GHz) Maximum output power #1 (dBm) Antenna gain #2 (dBi) Maximum EIRP #3 (dBm) Maximum tune-up #4 EIRP(dBm) Minimum distance (mm) Evaluated value LimitResult BT2.4802.45-0.681.772.005.000.49923.00PASS Note #1:ThisvaluecomesfromtheRFtestreport. #2:Thisvalueisdeclaredbytheapplicant. #3:EIRP=Maximumoutputpower+Antennagain. #4:Thisvalueisdeclaredbytheapplicant. ReportNo.:CISRR26031815202 Reporttemplateversion:CISE-TR-001-A0Page:5of5 5.2.Simultaneoustransmission Limit: KDB447498D01v06,Clause4.3.2,47CFRPart1.1307 InthecaseofxedRFsourcesoperatinginthesametime-averagingperiod,orof multiplemobileorportableRFsourceswithinadeviceoperatinginthesametime averagingperiod,ifthesumofthefractionalcontributionstotheapplicablethresholds islessthanorequalto1asindicatedinthefollowingequation. Where a=numberoffxed,mobile,orportableRFsourcesclaimingexemptionusingparagraph (b)(3)(i)(B)ofthissectionforP,includingexistingexempttransmittersandthosebeing added. b=numberoffxed,mobile,orportableRFsourcesclaimingexemptionusingparagraph (b)(3)(i)(C)ofthissectionforThresholdERP,includingexistingexempttransmittersand thosebeingadded. c=numberofexistingfixed,mobile,orportableRFsourceswithknownevaluationforthespeci edminimumdistanceincludingexistingevaluatedtransmitters. P j =theavailablemaximumtime-averagedpowerortheERP,whicheverisgreater,forxed, mobile,orportableRFsourceiatadistancebetween0.5cmand40cm(inclusive). P th,j =theexemptionthresholdpower(P)accordingtoparagraph(b)(3)(i)(B)ofthissectionfor xed,mobile,orportableRFsourcei. ERP j =theERPoffixed,mobile,orportableRFsourcej. ERP th,j =exemptionthresholdERPforfixed,mobile,orportableRFsourcej,atadistanceofat leastλ/2πaccordingtotheapplicableformulaofparagraph(b)(3)(i)(C)ofthissection. Evaluated k =themaximumreportedSARorMPEoffixed,mobile,orportableRFsourcekeither inthedeviceoratthetransmittersitefromanexistingevaluationatthelocationofexposure. ExposureLimit k =eitherthegeneralpopulation/uncontrolledmaximumpermissibleexposure (MPE)orspecicabsorptionrate(SAR)limitforeachxed,mobile,orportableRFsourcek, asapplicablefrom§1.1310ofthischapter. Result:NotApplicable --------EndofReport--------

AntennaSpecification Summary ITEMANTSPEC ModelName 2.4GANT Center Frequency HorizontalVertical 2400MHz2400MHz2500MHz2400MHz2400MHz2500MHz -1.73-0.84-0.68-6.15-3.70-2.32 PeakGain(dBi) -0.68 Polarization HorizontalandVertical AzimuthBeam Pattern Omni-directional Impedance 50Ohm AntennaLength 38.20mm Manufacture ShenzhenDewanghongTechnologyCo.LTD Address 6/F,BuildingB5,AnleIndustrialZone,HangchengAvenue,Gushu,Xixiang,Baoan DistrictShenzhen,China AntennaPhoto&Length(mm) Horizontal:2400MHz2450MHz2500MHz Power(dBm) Max:0Min:-40Scale:5/div Frequency (MHz) Gain(dBi) Max Min Avg 2400-1.73178-30.0815-8.48713 2450-0.845801-38.5605-7.88012 2500-0.685586-24.0318-6.79139 Vertical:2400MHz2450MHz2500MHz Power(dBm) Max:0Min:-30Scale:5/div Frequency (MHz) Gain(dBi) Max Min Avg 2400-6.1530-24.1420-13.0295 2450-3.7054-26.5836-10.6700 2500-2.32122-30.4301-9.70536

ReportNo.:CISRR26031815201 Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangce TestingTechnologyCo.,Ltd. Page1of56 TESTREPORT ReportNo.CISRR26031815201 ProjectNo.CISR260318152 FCCID2BUZB-GD31 ApplicantShenzhenDewanghongTechnologyCo.LTD Address 6/F,BuildingB5,AnleIndustrialZone,HangchengAvenue,Gushu, Xixiang,BaoanDistrictShenzhen,China ManufacturerShenzhenDewanghongTechnologyCo.LTD Address 6/F,BuildingB5,AnleIndustrialZone,HangchengAvenue,Gushu, Xixiang,BaoanDistrictShenzhen,China ProductNamewirelessearphones Trademark- Model/TypereferenceGD31 ListedModel(s)- Standard 47CFRPart15.247 DateofsamplereceiptMarch19,2026 TestdateMarch19,2026toMarch25,2026 IssuedateMarch25,2026 TestresultComplied Reviewedby:LucasHuang Approvedby:HansHu ReportNo.:CISRR26031815201 Page 2 of 56 Contents 1.STANDARDANDAPPLICABLETESTMETHODS........................................................................................3 2.REPORTVERSION..........................................................................................................................................3 3.TESTDESCRIPTION.......................................................................................................................................4 4.SUMMARY........................................................................................................................................................5 4.1.ProductDescription*..................................................................................................................................5 4.2.RadioSpecificationDescription*..............................................................................................................5 4.3.ModificationofEUT.....................................................................................................................................6 4.4.Deviationfromstandards...........................................................................................................................6 4.5.TestingSite...................................................................................................................................................6 5.TESTCONFIGURATION.................................................................................................................................7 5.1.Testfrequencylist.......................................................................................................................................7 5.2.Descriptionsoftestmode...........................................................................................................................7 5.3.Testsampleinformation.............................................................................................................................7 5.4.Environmentalconditions...........................................................................................................................7 5.5.Statementofthemeasurementuncertainty.............................................................................................7 5.6.EquipmentUsedduringtheTest................................................................................................................8 6.TESTRESULTS.............................................................................................................................................10 6.1.EvaluationResults(Evaluation)...............................................................................................................10 6.1.1.AntennaRequirement............................................................................................................................10 6.2.RadioSpectrumMatterTestResults(RF)...............................................................................................11 6.2.1.ConductedEmissionatACpowerline.................................................................................................11 6.2.2.20dBBandwidth......................................................................................................................................14 6.2.3.MaximumConductedOutputPower.....................................................................................................16 6.2.4.ChannelSeparation................................................................................................................................17 6.2.5.NumberofHoppingFrequencies..........................................................................................................18 6.2.6.DwellTime...............................................................................................................................................19 6.2.7.Conductedbandedgeandspuriousemission...................................................................................21 6.2.8.Radiatedbandedgeemission...............................................................................................................23 6.2.9.RadiatedSpuriousEmission(below1GHz).........................................................................................29 6.2.10.RadiatedSpuriousEmission(Above1GHz)......................................................................................33 7.APPENDIXREPORT......................................................................................................................................41 7.1.ConductedOutputPower.........................................................................................................................41 7.2.20dBBandwidth.........................................................................................................................................43 7.3.NumberOfHoppingChannel...................................................................................................................45 7.4.CarrierFrequenciesSeparation.............................................................................…

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ReportNo.:CISRR26031815201 Page 58 of 63 8.TESTSETUPPHOTOS ConductedEmissionatACpowerline Radiatedbandedgeemission RadiatedSpuriousEmission(Above1GHz) ReportNo.:CISRR26031815201 Page 59 of 63 RadiatedSpuriousEmission(below1GHz)