2BU4V-XDKF90Open Ear Bluetooth 5.5 Wireless Earbuds

合格证 Certificate of conformity 型号： 检验员： 出厂日期： (Model) (Inspector) (Date) 检 01 QC PASS Digital Display Matching Answer calls/reject calls Volume Adjustment Switching Songs Switch between Chinese and English On / off XDK-F90-AB5756H-V1.5 User Manual 0 Open Ear Bluetooth 5.5 Wireless Earbuds FCCStatement Thisdevicecomplieswithpart15oftheFCCRules.Operationissubjecttothefollowingtwo conditions:(1)Thisdevicemaynotcauseharmfulinterference,and(2)thisdevicemust acceptanyinterferencereceived,includinginterferencethatmaycauseundesiredoperation. ThisequipmenthasbeentestedandfoundtocomplywiththelimitsforaClassBdigitaldevice, pursuanttoPart15oftheFCCRules.Theselimitsaredesignedtoprovidereasonable protectionagainstharmfulinterferenceinaresidentialinstallation.Thisequipmentgenerates usesandcanradiateradiofrequencyenergyand,ifnotinstalledandusedinaccordancewith theinstructions,maycauseharmfulinterferencetoradiocommunications.However,thereis noguaranteethatinterferencewillnotoccurinaparticularinstallation.Ifthisequipmentdoes causeharmfulinterferencetoradioortelevisionreception,whichcanbedeterminedbyturning theequipmentoffandon,theuserisencouragedtotrytocorrecttheinterferencebyoneor moreofthefollowingmeasures: --Reorientorrelocatethereceivingantenna. --Increasetheseparationbetweentheequipmentandreceiver. --Connecttheequipmentintoanoutletonacircuitdifferentfromthattowhichthereceiveris connected. --Consultthedealeroranexperiencedradio/TVtechnicianforhelp. AnyChangesormodificationsnotexpresslyapprovedbythepartyresponsibleforcompliance couldvoidtheuser'sauthoritytooperatetheequipment. ThisequipmentcomplieswiththeFCCradiationexposurelimitssetforthforanuncontrolled environment,Thistransmittermustnotbeco-locatedoroperatinginconjunctionwithanyother antennaortransmitter.

ShenzhenCenturyYuandaE-commerceCo.,Ltd. AttestationStatements NotCoveredEntityApplicant&NotCoveredEquipment To:FederalCommunicationsCommissionDate:Apr.8,26 7435OaklandMillsRoad, Columbia,MD21046,USA Ref:InformationRequiredbySection2.911(d)(5)(i)&(ii) FCCID:2BU4V-XDKF90 ShenzhenCenturyYuandaE-commerceCo.,Ltd..(“theapplicant”)certifiesthat,asofthedateofthe filingoftheapplication,theapplicantisnotidentifiedontheCoveredList,establishedpursuantto§ 1.50002ofreferencechapter,asanentityproducing“covered”communicationequipment.The equipmentforwhichauthorizationissoughtisnot“covered”telecommunicationsequipmentandvideo surveillanceequipmentproducedbyentitiesidentifiedontheCommission’sCoveredListthatprohibited fromreceivinganequipmentauthorizationpursuanttosection§2.903oftheFCCrules. Sincerelyyours, ApplicantSignature PrintedName:ZhaoLei Title:Director Address:No.508,LongshengBuilding,IndustrialWestRoad,LongshengCommunity,DalangSubdistrict, LonghuaDistrict,ShenzhenCity,China Tel.:+8617818688843 Email:[email protected]

ShenzhenCenturyYuandaE-commerceCo.,Ltd. 1|Page AttestationStatements To:FederalCommunicationsCommissionDate:Apr.8,26 7435OaklandMillsRoad, Columbia,MD21046,USA Subject:AttestationofCompliancewithFCCCoveredListSoftwareRequirements FCCID:2BU4V-XDKF90 ProductName:OpenEarBluetooth5.5WirelessEarbuds 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:ZhaoLei Title:Director Address:No.508,LongshengBuilding,IndustrialWestRoad,LongshengCommunity,DalangSubdistrict, LonghuaDistrict,ShenzhenCity,China Tel.:+8617818688843 Email:[email protected] ShenzhenCenturyYuandaE-commerceCo.,Ltd. 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) Seeattached“SBoM“ Note:TheSBoMcontentislimited tothescopeofcoveredlist software(e.g.antivirusand cybersecuritysoftware). ☐ EvaluationBasedonScanfor Softwareonthedevice ☐ EvaluationBasedonFilesystemscan ☐ EvaluationBasedonRunning softwarecheck

ShenzhenCenturyYuandaE-commerceCo.,Ltd. U.S.AgentLetterofAttestation To:FederalCommunicationsCommission 7435OaklandMillsRoad,Columbia,MD21046,USA Date:Apr.8,26 Ref: AttestationStatement–Part 2.911(d)(7)filing FCCID:2BU4V-XDKF90 [ShenzhenCenturyYuandaE-commerceCo.,Ltd.](“theapplicant”)certifiesthat,asofthedateof thefilingoftheapplication,[TRANS-PACCHINALLC](“theagent”)isourdesignatedU.S.agentfor serviceofprocessfortheabovereferenceFCCID.Theapplicantacceptstomaintainanagentfor serviceofprocessintheUnitedStatesfornolessthanoneyearaftereitherthegranteehas permanentlyterminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S., ortheconclusionofanyCommission-relatedadministrativeorjudicialproceedinginvolvingthe equipment,whicheverislater.Theapplicantfurtheracknowledgesitisourresponsibilitytoinform theFCCwhenevertheagentinformationchanges. [TRANS-PACCHINALLC]("theagent)understanditistheagent'sobligationtoacceptserviceof processintheUnitedStatesformattersrelatedtotheapplicableequipment,andatthephysicalU.S. addressandemailaddress. DesignatedU.S.Agent CompanyName:TRANS-PACCHINALLC FRN:0036394526 3715S182ndStreet,C120Seatac,WA98188United States Signature: ContactPerson:LisaLee Tel:(818)818-0538 Email:[email protected] Applicant CompanyName:ShenzhenCenturyYuandaE-commerceCo.,Ltd. FRN:0036413961 Address:No.508,LongshengBuilding,IndustrialWest Road,LongshengCommunity,DalangSubdistrict, LonghuaDistrict,ShenzhenCity,China Signature: ContactPerson:ZhaoLei Tel:+8617818688843Email:[email protected]

ShenzhenCenturyYuandaE-commerceCo.,Ltd. (Mar31,2026) FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:ConfidentialityRequestfor:FCCID:2BU4V-XDKF90 PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestpermanent confidentialtreatmentoftheexhibitsaccompanyingthiscertificationapplicationasoutlinedbelow:  BlockDiagram Schematics  OperationalDescription Theaboveexhibitscontaintradesecretsand/orproprietaryinformationthatarenotpubliclyavailableand materialsthattheApplicanthasspentconsiderableeffortsindeveloping.Publicdisclosureofthesemay beharmfultotheApplicantandgiveanunfairadvantagetocompetitorsonthemarket. Sincerely, (Signature) Title:Director Address:No.508,LongshengBuilding,IndustrialWestRoad,LongshengCommunity,DalangSubdistrict, LonghuaDistrict,ShenzhenCity,China Tel.:+8617818688843 Email:[email protected]

ShenzhenCenturyYuandaE-commerceCo.,Ltd. (Mar31,2026) FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:AgentAuthorizationforFCCID:2BU4V-XDKF90 I,theundersigned,herebyauthorizeHDTestingTechnology(GuangDong)Co.,Ltd.toactonourbehalf inallmattersrelatingtothisapplicationforequipmentcertification. AnyactcarriedoutbyHDTestingTechnology(GuangDong)Co.,Ltd.shallhavethesameeffectasour ownandIacknowledgethatallresponsibilityforcomplyingwiththetermsandconditionsofcertification, asspecifiedbyDERYCOMCERTIFICATIONSERVICES,INC.,stillresideswithShenzhenCentury YuandaE-commerceCo.,Ltd. . WecertifythatwearenotsubjecttoadenialoffederalbenefitsthatincludesFCCbenefitspursuantto Section5301oftheAnti-DrugAbuseActof1988,21U.S.C.§862,andthatnopartytotheapplication,as definedin47CFR§1.2002(b),issubjecttoadenialoffederalbenefitsthatincludesFCCbenefits pursuanttothatsection. Sincerely, (Signature) (ZhaoLei) (Director) Tel:+8617818688843 Email:[email protected]

FCCID:2BU4V-XDKF90 Page 1 / 3 PHOTOSOFEUTEXTERNALPHOTOS EUTPhoto EUTPhoto FCCID:2BU4V-XDKF90 Page 2 / 3 EUTPhoto EUTPhoto FCCID:2BU4V-XDKF90 Page 3 / 3 EUTPhoto EUTPhoto

FCCID:2BU4V-XDKF90

FCCID:2BU4V-XDKF90 Page 1 / 4 PHOTOSOFEUTINTERNALPHOTOS EUTPhoto EUTPhoto FCCID:2BU4V-XDKF90 Page 2 / 4 EUTPhoto EUTPhoto FCCID:2BU4V-XDKF90 Page 3 / 4 EUTPhoto EUTPhoto BluetoothAntenna FCCID:2BU4V-XDKF90 Page 4 / 4 EUTPhoto EUTPhoto

ReportNo.:86260324037Date:April9,2026Page1of5 HDTestingTechnology(GuangDong)Co.,Ltd. Building1,No.18,ShihuanRoad,DongchengSubdistrict, Dongguan,Guangdong,China Tel:+86-0769-22221088 E-mail:[email protected] Website:www.hdt-lab.com Thisreportisgovernedby,andincorporatesbyreference,theconditionsoftestingaspostedatthe dateofissuanceofthisreportathttp://www.hdt-lab.com/andisintendedforyourexclusiveuse.Any copyingorreplicationofthisreporttoorforanyotherpersonorentity,oruseofournameortrademark, ispermittedonlywithourpriorwrittenpermission.Thisreportsetsforthourfindingssolelywithrespect tothetestsamplesidentifiedherein.Theresultssetforthinthisreportarenotindicativeor representativeofthequalityorcharacteristicsofthelotfromwhichatestsamplewastakenorany similaroridenticalproductunlessspecificallyandexpresslynoted.Ourreportincludesallofthetests requestedbyyouandtheresultsthereofbasedupontheinformationthatyouprovidedtous. Measurementuncertaintyisonlyprovideduponrequestforaccreditedtests.Statementsofconformity arebasedonsimpleacceptancecriteriawithouttakingmeasurementuncertaintyintoaccount,unless otherwiserequestedinwriting.Youhave15daysfromdateofissuanceofthisreporttonotifyusofany materialerrororomissioncausedbyournegligenceorifyourequiremeasurementuncertainty; provided,however,thatsuchnoticeshallbeinwritingandshallspecificallyaddresstheissueyouwish toraise.Afailuretoraisesuchissuewithintheprescribedtimeshallconstituteyourunqualified acceptanceofthecompletenessofthisreport,thetestsconductedandthecorrectnessofthereport contents. RFTESTREPORT Applicant: ShenzhenCenturyYuandaE-commerceCo.,Ltd. Address: No.508,LongshengBuilding,IndustrialWestRoad,LongshengCommunity, DalangSubdistrict,LonghuaDistrict,ShenzhenCity,China Manufacturer: ShenzhenTengxingdaTechnologyCo.,Ltd. Address: 5thFloor,Room501,Building5,2013ChuangyeValley,No.3FushiRoad, SilianCommunity,HenggangSubdistrict,LonggangDistrict,ShenzhenCity, GuangdongProvince,China EUTName:OpenEarBluetooth5.5WirelessEarbuds Trademark:/ Model:XDK-F90-AB5756H-V1.5 FCCID ：2BUZA-XDKF90 Rating:DC5Vor3.7Vbybattery SampleReceived Date: Mar.24,2026 TestDate:Mar.24,2026~Apr.08,2026 Applicable Standards: CFR47,FCCPart2.1093 TestResultPass Preparedby:Approvedby: EvanFang/ProjectEngineerBruceZhang/TechnicalManager ReportNo.:86260324037 April9,2026 Page2of5 HDTestingTechnology(GuangDong)Co.,Ltd. Building1,No.18,ShihuanRoad,DongchengSubdistrict, Dongguan,Guangdong,China Tel:+86-0769-22221088 E-mail:[email protected] Website:www.hdt-lab.com Thisreportisgovernedby,andincorporatesbyreference,theconditionsoftestingaspostedatthe dateofissuanceofthisreportathttp://www.hdt-lab.com/andisintendedforyourexclusiveuse.Any copyingorreplicationofthisreporttoorforanyotherpersonorentity,oruseofournameortrademark, ispermittedonlywithourpriorwrittenpermission.Thisreportsetsforthourfindingssolelywithrespect tothetestsamplesidentifiedherein.Theresultssetforthinthisreportarenotindicativeor representativeofthequalityorcharacteristicsofthelotfromwhichatestsamplewastakenorany similaroridenticalproductunlessspecificallyandexpresslynoted.Ourreportincludesallofthetests requestedbyyouandtheresultsthereofbasedupontheinformationthatyouprovidedtous. Measurementuncertaintyisonlyprovideduponrequestforaccreditedtests.Statementsofconformity arebasedonsimpleacceptancecriteriawithouttakingmeasurementuncertaintyintoaccount,unless otherwiserequestedinwriting.Youhave15daysfromdateofissuanceofthisreporttonotifyusofany materialerrororomissioncausedbyournegligenceorifyourequiremeasurementuncertainty; provided,however,thatsuchnoticeshallbeinwritingandshallspecificallyaddresstheissueyouwish toraise.Afailuretoraisesuchissuewithintheprescribedtimeshallconstituteyourunqualified acceptanceofthecompletenessofthisreport,thetestsconductedandthecorrectnessofthereport contents. RevisionHistory VersionDateofIssueDescription V00April9,2026OriginalVersion ReportNo.:86260324037 April9,2026 Page3of5 HDTestingTechnology(GuangDong)Co.,Ltd. Building1,No.18,ShihuanRoad,DongchengSubdistrict, Dongguan,Guangdong,China Tel:+86-0769-22221088 E-mail:[email protected] Website:www.hdt-lab.com Thisreportisgovernedby,andincorporatesbyreference,theconditionsoftestingaspostedatthe dateofissuanceofthisreportathttp://www.hdt-lab.com/andisintendedforyourexclusiveuse.Any copyingorreplicationofthisreporttoorforanyotherpersonorentity,oruseofournameortrademark, ispermittedonlywithourpriorwrittenpermission.Thisreportsetsforthourfindingssolelywithrespect tothetestsamplesidentifiedherein.Theresultssetforthinthisreportarenotindicativeor representativeofthequalityorcharacteristicsofthelotfromwhichatestsamplewastakenorany similaroridenticalproductunlessspecificallyandexpresslynoted.Ourreportincludesallofthetests requestedbyyouandtheresultsthereofbasedupontheinformationthatyouprovidedtous. Measurementuncertaintyisonlyprovideduponrequestforaccreditedtests.Statementsofconformity arebasedonsimpleacceptancecriteriawithouttakingmeasurementuncertaintyintoaccount,unless otherwiserequestedinwriting.Youhave15daysfromdateofissuanceofthisreporttonotifyusofany materialerrororomissioncausedbyournegligenceorifyourequiremeasurementuncertainty; provided,however,thatsuchnoticeshallbeinwritingandshallspecificallyaddresstheissueyouwish toraise.Afailuretoraisesuchissuewithintheprescribedtimeshallconstituteyourunqualified acceptanceofthecompletenessofthisreport,thetestsconductedandthecorrectnessofthereport contents. 1.EUTDESCRIPTION Product:OpenEarBluetooth5.5WirelessEarbuds TestModel:XDK-F90-AB5756H-V1.5 AdditionalModel:N/A Rating:DC5Vor3.7Vbybattery FCCID:2BUZA-XDKF90 AntennaType:PCBAntenna AntennaGain:-2.9dBi OperationFrequency:2402-2480MHz NumberofChannels:79 ModulationType:GFSK,π/4-DQPSK,8DPSK HardwareVersion:N/A SoftwareVersion:N/A Note: 1)Foramoredetailedfeaturesdescription,pleaserefertothemanufacturer'sspecificationsorthe User'sManual. 2)Antennagainwasprovidedbytheapplicant/manufacturer,andtheapplicant/manufactureris responsibleforitsvalidity. 3)Thetestresultsinthereportonlya…

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FCCID:2BU4V-XDKF90 1/13 AppendixA:TestResultsofBluetoothBR&EDR ConductedOutputPower TestResult ModulationPacketTypeChannel PeakOutput Power (dBm) PeakOutput Power (mW) Max.Avg. Power (dBm) Limit (dBm) Result GFSKDH5 0-0.450.90None ≤30 PASS 39-0.560.88NonePASS 78-0.950.80NonePASS π/4DQPSK2-DH5 0-0.500.89NonePASS 39-0.570.88NonePASS 78-0.960.80NonePASS 8DPSK3-DH5 0-0.480.89NonePASS 39-0.570.88NonePASS 78-0.950.80NonePASS TestGraphs PeakOutputPower GFSK_Channel0 PeakOutputPower GFSK_Channel39 PeakOutputPower GFSK_Channel78 PeakOutputPower π/4DQPSK_Channel0 FCCID:2BU4V-XDKF90 2/13 PeakOutputPower π/4DQPSK_Channel39 PeakOutputPower π/4DQPSK_Channel78 PeakOutputPower 8DPSK_Channel0 PeakOutputPower 8DPSK_Channel39 PeakOutputPower 8DPSK_Channel78 FCCID:2BU4V-XDKF90 3/13 99%Bandwidth TestResult ModulationChannelCenterFrequency(MHz)99%BW(MHz) GFSK 024020.86488 3924410.85266 7824800.86040 π/4DQPSK 024021.1776 3924411.2040 7824801.1872 8DPSK 024021.1964 3924411.1917 7824801.2000 TestGraphs GFSK_DH5_Channel0π/4DQPSK_2-DH5_Channel0 GFSK_DH5_Channel39π/4DQPSK_2-DH5_Channel39 GFSK_DH5_Channel78π/4DQPSK_2-DH5_Channel78 FCCID:2BU4V-XDKF90 4/13 8DPSK_3-DH5_Channel08DPSK_3-DH5_Channel39 8DPSK_3-DH5_Channel78 FCCID:2BU4V-XDKF90 5/13 20dBBandwidth TestResult ModulationChannelCenterFrequency(MHz)20dBBandwidth(MHz) GFSK 02402MHz0.9592 392441MHz0.9535 782480MHz0.9561 π/4DQPSK 02402MHz1.271 392441MHz1.275 782480MHz1.275 8DPSK 02402MHz1.283 392441MHz1.288 782480MHz1.290 TestGraphs GFSK_DH5_Channel0GFSK_DH5_Channel39 GFSK_DH5_Channel78π/4DQPSK_2-DH5_Channel0 π/4DQPSK_2-DH5_Channel39π/4DQPSK_2-DH5_Channel78 FCCID:2BU4V-XDKF90 6/13 8DPSK_3-DH5_Channel08DPSK_3-DH5_Channel39 8DPSK_3-DH5_Channel78 FCCID:2BU4V-XDKF90 7/13 CarrierFrequenciesSeparation TestResult ModulationPacket LeftCenter frequency (MHz) RightCenter frequency (MHz) Hopping Frequency Separation (MHz) Limit(MHz)Result GFSKDH52440.18872440.87760.68890.639PASS π/4DQPSK2-DH52440.06452441.20611.14160.85PASS 8DPSK3-DH52439.87372441.19051.31680.86PASS TestGraphs GFSKπ/4DQPSK 8DPSK FCCID:2BU4V-XDKF90 8/13 ConductedSpurious&BandEdgeEmission TestResult Non-Hopping ModulationPacketChannel OOB Emission Frequency (MHz) OOB Emission Level (dBm) Limit (dBm) OverLimit (dB) Result GFSKDH5 0 2400.00-52.480-20.65-31.830PASS 7206.38-45.348-20.65-24.698PASS 397323.11-45.197-20.75-24.447PASS 78 2287.91-48.007-21.14-26.867PASS 2483.50-57.627-21.14-36.487PASS π/4DQPSK2-DH5 0 2400.00-50.340-20.68-29.660PASS 7205.75-50.082-20.68-29.402PASS 399763.93-51.990-20.74-31.250PASS 78 2483.50-59.067-21.14-37.927PASS 9919.99-52.126-21.14-30.986PASS 8DPSK3-DH5 0 2400.00-51.369-20.71-30.659PASS 9607.87-53.224-20.71-32.514PASS 397323.74-50.376-21.01-29.366PASS 78 2287.91-51.976-21.18-30.796PASS 2483.50-58.693-21.18-37.513PASS Note:inputcompensationcoeffcient(dB)=CableLoss(dB) Hopping ModulationPacketChannel OOB Emission Frequency (MHz) OOB Emission Level (dBm) Limit (dBm) OverLimit (dB) Result GFSKDH5 Hopping 2400.00-52.275-20.73-31.545PASS 2483.50-57.918-21.1-36.818PASS π/4DQPSK2-DH5 2381.16-55.264-20.65-34.614PASS 2400.00-56.087-20.65-35.437PASS 2483.50-56.460-21.2-35.260PASS 8DPSK3-DH5 2400.00-53.591-20.66-32.931PASS 2483.50-57.056-21.04-36.016PASS Note:inputcompensationcoeffcient(dB)=CableLoss(dB) TestGraphs OutOfBandEmission GFSK_DH5_Channel0 OutOfBandEmission π/4DQPSK_2-DH5_Channel0 FCCID:2BU4V-XDKF90 9/13 30.0MHz-25000.0MHz GFSK_DH5_Channel0 30.0MHz-25000.0MHz π/4DQPSK_2-DH5_Channel0 OutOfBandEmission GFSK_DH5_Channel39 OutOfBandEmission π/4DQPSK_2-DH5_Channel39 30.0MHz-25000.0MHz GFSK_DH5_Channel39 30.0MHz-25000.0MHz π/4DQPSK_2-DH5_Channel39 OutOfBandEmission GFSK_DH5_Channel78 OutOfBandEmission π/4DQPSK_2-DH5_Channel78 FCCID:2BU4V-XDKF90 10/13 30.0MHz-25000.0MHz GFSK_DH5_Channel78 30.0MHz-25000.0MHz π/4DQPSK_2-DH5_Channel78 OutOfBandEmission 8DPSK_3-DH5_Channel0 30.0MHz-25000.0MHz 8DPSK_3-DH5_Channel0 OutOfBandEmission 8DPSK_3-DH5_Channel39 30.0MHz-25000.0MHz 8DPSK_3-DH5_Channel39 OutOfBandEmission 8DPSK_3-DH5_Channel78 30.0MHz-25000.0MHz 8DPSK_3-DH5_Channel78 FCCID:2BU4V-XDKF90 11/13 OutOfBandEmission(Left) GFSK_DH5_ChannelHopping OutOfBandEmission(Left) π/4DQPSK_2-DH5_ChannelHopping OutOfBandEmission(Right) GFSK_DH5_ChannelHopping OutOfBandEmission(Right) π/4DQPSK_2-DH5_ChannelHopping OutOfBandEmission(Left) 8DPSK_3-DH5_ChannelHopping OutOfBandEmission(Right) 8DPSK_3-DH5_ChannelHopping FCCID:2BU4V-XDKF90 12/13 DwellTime TestResult ModulationPacketChannel PulseWidth (ms) Numberof Pulsesin 31.6seconds DwellTime (ms) Limit(ms)Result GFSKDH5 Hopping 2.880125360.0 <400 PASS π/4DQPSK2-DH52.896102295.39PASS 8DPSK3-DH52.896118341.73PASS Note:Dwelltime=Pulsetime(ms)*NumberofPulsesin31.6seconds TestGraphs PulseWidth GFSK_DH5 NumberofPulsesin31.6seconds GFSK_DH5 PulseWidth π/4DQPSK_2-DH5 NumberofPulsesin31.6seconds π/4DQPSK_2-DH5 PulseWidth 8DPSK_3-DH5 NumberofPulsesin31.6seconds 8DPSK_3-DH5 FCCID:2BU4V-XDKF90 13/13 NumberOfHoppingChannel TestResult ModulationPacket NumberofHopping Channel LimitResult GFSKDH57915PASS π/4DQPSK2-DH57915PASS 8DPSK3-DH57915PASS TestGraphs LowEndSpectrumChannelHoppingPlot GFSK HighEndSpectrumChannelHoppingPlot GFSK LowEndSpectrumChannelHoppingPlot π/4DQPSK HighEndSpectrumChannelHoppingPlot π/4DQPSK LowEndSpectrumChannelHoppingPlot 8DPSK HighEndSpectrumChannelHoppingPlot 8DPSK

ReportNo.:86260324036Date:April9,2026Page1of42 HDTestingTechnology(GuangDong)Co.,Ltd. Building1,No.18,ShihuanRoad,DongchengSubdistrict, Dongguan,Guangdong,China Tel:+86-0769-22221088 E-mail:[email protected] Website:www.hdt-lab.com Thisreportisgovernedby,andincorporatesbyreference,theconditionsoftestingaspostedatthe dateofissuanceofthisreportathttp://www.hdt-lab.com/andisintendedforyourexclusiveuse.Any copyingorreplicationofthisreporttoorforanyotherpersonorentity,oruseofournameortrademark, ispermittedonlywithourpriorwrittenpermission.Thisreportsetsforthourfindingssolelywithrespect tothetestsamplesidentifiedherein.Theresultssetforthinthisreportarenotindicativeor representativeofthequalityorcharacteristicsofthelotfromwhichatestsamplewastakenorany similaroridenticalproductunlessspecificallyandexpresslynoted.Ourreportincludesallofthetests requestedbyyouandtheresultsthereofbasedupontheinformationthatyouprovidedtous. Measurementuncertaintyisonlyprovideduponrequestforaccreditedtests.Statementsofconformity arebasedonsimpleacceptancecriteriawithouttakingmeasurementuncertaintyintoaccount,unless otherwiserequestedinwriting.Youhave15daysfromdateofissuanceofthisreporttonotifyusofany materialerrororomissioncausedbyournegligenceorifyourequiremeasurementuncertainty; provided,however,thatsuchnoticeshallbeinwritingandshallspecificallyaddresstheissueyouwish toraise.Afailuretoraisesuchissuewithintheprescribedtimeshallconstituteyourunqualified acceptanceofthecompletenessofthisreport,thetestsconductedandthecorrectnessofthereport contents. RFTESTREPORT Applicant: ShenzhenCenturyYuandaE-commerceCo.,Ltd. Address: No.508,LongshengBuilding,IndustrialWestRoad,LongshengCommunity, DalangSubdistrict,LonghuaDistrict,ShenzhenCity,China Manufacturer: ShenzhenTengxingdaTechnologyCo.,Ltd. Address: 5thFloor,Room501,Building5,2013ChuangyeValley,No.3FushiRoad, SilianCommunity,HenggangSubdistrict,LonggangDistrict,ShenzhenCity, GuangdongProvince,China EUTName:OpenEarBluetooth5.5WirelessEarbuds Trademark:/ Model:XDK-F90-AB5756H-V1.5 FCCID ：2BU4V-XDKF90 Rating:DC5Vor3.7Vbybattery SampleReceived Date: Mar.24,2026 TestDate:Mar.24,2026~Apr.08,2026 Applicable Standards: CFR47,FCCPart15.247 TestResultPass Preparedby:Approvedby: EvanFang/ProjectEngineerBruceZhang/TechnicalManager ReportNo.:86260324036 April9,2026 Page2of42 HDTestingTechnology(GuangDong)Co.,Ltd. Building1,No.18,ShihuanRoad,DongchengSubdistrict, Dongguan,Guangdong,China Tel:+86-0769-22221088 E-mail:[email protected] Website:www.hdt-lab.com Thisreportisgovernedby,andincorporatesbyreference,theconditionsoftestingaspostedatthe dateofissuanceofthisreportathttp://www.hdt-lab.com/andisintendedforyourexclusiveuse.Any copyingorreplicationofthisreporttoorforanyotherpersonorentity,oruseofournameortrademark, ispermittedonlywithourpriorwrittenpermission.Thisreportsetsforthourfindingssolelywithrespect tothetestsamplesidentifiedherein.Theresultssetforthinthisreportarenotindicativeor representativeofthequalityorcharacteristicsofthelotfromwhichatestsamplewastakenorany similaroridenticalproductunlessspecificallyandexpresslynoted.Ourreportincludesallofthetests requestedbyyouandtheresultsthereofbasedupontheinformationthatyouprovidedtous. Measurementuncertaintyisonlyprovideduponrequestforaccreditedtests.Statementsofconformity arebasedonsimpleacceptancecriteriawithouttakingmeasurementuncertaintyintoaccount,unless otherwiserequestedinwriting.Youhave15daysfromdateofissuanceofthisreporttonotifyusofany materialerrororomissioncausedbyournegligenceorifyourequiremeasurementuncertainty; provided,however,thatsuchnoticeshallbeinwritingandshallspecificallyaddresstheissueyouwish toraise.Afailuretoraisesuchissuewithintheprescribedtimeshallconstituteyourunqualified acceptanceofthecompletenessofthisreport,thetestsconductedandthecorrectnessofthereport contents. RevisionHistory VersionDateofIssueDescription V00April9,2026OriginalVersion ReportNo.:86260324036 April9,2026 Page3of42 HDTestingTechnology(GuangDong)Co.,Ltd. Building1,No.18,ShihuanRoad,DongchengSubdistrict, Dongguan,Guangdong,China Tel:+86-0769-22221088 E-mail:[email protected] Website:www.hdt-lab.com Thisreportisgovernedby,andincorporatesbyreference,theconditionsoftestingaspostedatthe dateofissuanceofthisreportathttp://www.hdt-lab.com/andisintendedforyourexclusiveuse.Any copyingorreplicationofthisreporttoorforanyotherpersonorentity,oruseofournameortrademark, ispermittedonlywithourpriorwrittenpermission.Thisreportsetsforthourfindingssolelywithrespect tothetestsamplesidentifiedherein.Theresultssetforthinthisreportarenotindicativeor representativeofthequalityorcharacteristicsofthelotfromwhichatestsamplewastakenorany similaroridenticalproductunlessspecificallyandexpresslynoted.Ourreportincludesallofthetests requestedbyyouandtheresultsthereofbasedupontheinformationthatyouprovidedtous. Measurementuncertaintyisonlyprovideduponrequestforaccreditedtests.Statementsofconformity arebasedonsimpleacceptancecriteriawithouttakingmeasurementuncertaintyintoaccount,unless otherwiserequestedinwriting.Youhave15daysfromdateofissuanceofthisreporttonotifyusofany materialerrororomissioncausedbyournegligenceorifyourequiremeasurementuncertainty; provided,however,thatsuchnoticeshallbeinwritingandshallspecificallyaddresstheissueyouwish toraise.Afailuretoraisesuchissuewithintheprescribedtimeshallconstituteyourunqualified acceptanceofthecompletenessofthisreport,thetestsconductedandthecorrectnessofthereport contents. TABLEOFCONTENTS 1.TESTSUMMARY......................................................................................................................................4 2.TESTSITE................................................................................................................................................5 2.1.TestFacility........................................................................................................................................5 2.2.MeasurementUncertainty..........................................................................…

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1 Product specification Quick Reference Antenna model information Antenna Type PCB Frequency 2.44GHz Ant. Port Input Pwr.(dBm) 0(Typ.BT class 2 output power) Tot.Rad.Pwr.(dBm) -5.8(Input pwr-loss pwr) Peak EIRP(dBm) -2.9 Directivity(dBi) 1(all direction antenna) Efficiency(dB) -5.8(26.03%) Gain(dBi) -2.9(Peak Gain XY-plane) Maximum Power(dBm) -2.9(XY-plane) Minimum Power(dBm) -7.9(XY-plane) Average Power(dBm) -4.5(XY-plane) Max/Min Ratio(dB) 5(XY-plane) Max/Avg Ratio(dB) 1.6(XY-plane) Min/Avg Ratio(dB) -3.4(XY-plane) Average Gain(dB) -4.5(Avg Gain XY-plane) Antenna module & Size Antenna Gain Gain Table Unit in dB@ 2.44GHz XY-plane XZ-plane YZ-plane Efficiency Peak Avg Peak Avg Peak Avg -4.5 -2.9 -3.7 -6.9 -2.9 -6.1 26.03% 2 3 3D radiation pattern diagram XY-plane 4 XZ-plane YZ-plane

FCCID:2BU4V-XDKF90 Page 1 / 2 ConductedEmissiononACMains RadiatedSpuriousEmission,Below1GHz FCCID:2BU4V-XDKF90 Page 2 / 2 RadiatedSpuriousEmission,Above1GHz