2BUKE-YD668Bluetooth Earphones

YD668 Press and hold the pause button for 2 seconds to reject the call. Wireless Chip: Effective Range: 10M Driver Unit: 13mm Rated Power: 3mW Sensitivity:110±3dB Frequency Response: 20Hz-20kHz Battery Specifications: 3.7V/350mAh Music Playback Time: ≈30h (1kHz 100% Volume) Charging Time: 4H±0.5h Speaker Impedance:32Ω±15% High-capacity, low-power, low-latency stereo wireless gaming headphones. Comfortable and secure to wear without feeling it. The earphones have a compact design, a delicate appearance, and clear, rich sound quality. Ultra-long battery life, say goodbye to range anxiety. Power button Volume up / Previous track Volume Down / Next Track Function key Bluetooth Earphones Charging port YD668YD668YD668 YD668 YD668 FCC Caution: 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. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

CoveredEquipmentAttestationLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(5)(i)-(ii)oftheCommission’sRules(47C.F.R.)weattestas followsfortheproductlistedbelow: FCCIDModelname 2BUKE-YD668OHR306,YD606,OHR711,YD668 We, Applicant CompanyName:GuraoQuemingElectronicsFactory, ChaoyangDistrict,ShantouCity Address:IntersectionofXianboGuRongRoadand ZhongyingRoad,GuraoTown,Chaoyang District,ShantouCity Phone:N/A certifythattheequipmentforwhichauthorizationissoughtisnot“covered”equipment prohibitedfromreceivinganequipmentauthorizationpursuanttosection2.903oftheFCC rules.Thisincludesthecybersecurityandanti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofistsuccessorsandassignees. Wecertifythat,asofthedateofthefilingoftheapplication,theapplicantisnotidentified ontheCoveredListasanentityproducing“covered”equipment. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-01-28 SignatureDate PrintedNameofSignee:XiaojieLiu Company:GuraoQuemingElectronics Factory,ChaoyangDistrict,ShantouCity Phone:+8613790880762 Email:[email protected] Address:IntersectionofXianboGuRong RoadandZhongyingRoad,GuraoTown, ChaoyangDistrict,ShantouCity Fax:N/A

GuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCity IntersectionofXianboGuRongRoadandZhongyingRoad,GuraoTown,ChaoyangDistrict, ShantouCity Date:2026-01-28 FCCID:2BUKE-YD668 ModelNumber:OHR306,YD606,OHR711,YD668 To:FederalCommunicationCommission AuthorizationandEvaluationDivision7435OaklandMillsRoad Columbia,MD21048 ToWhomItMayConcern, We,GuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCityherebydeclare thatourproduct(WirelessDoorbell ) ModelNumber:OHR306,YD606,OHR711,YD668 electricalidentical,theSchematic,PCBlayout,structureandsoftwarearesame,onlythe differenceinappearancecolor. Shouldyouhaveanyquestionsorcommentsregardingthismatter,pleasehave mybestattention. Sincerely, (Signed) Name/Title:XiaojieLiu/Manager Company:GuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCity Address:IntersectionofXianboGuRongRoadandZhongyingRoad,GuraoTown, ChaoyangDistrict,ShantouCity Phone:+8613790880762 FaxNumber:N/A E-Mail:[email protected]

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 2BUKE-YD668OHR306,YD606,OHR711,YD668 Fortheproductslistedabove,werequestpermanentconfidentialityforallapplicable exhibitsasthereare:  theOperationalDescription  theBlockDiagram theSchematics Theabovelistedexhibitscontaintradesecretsandproprietaryinformationthatcouldbeof benefittoourcompetitors. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-01-28 SignatureDate PrintedNameofSignee/Title:XiaojieLiu/Manager Company:GuraoQuemingElectronicsFactory,ChaoyangDistrict, ShantouCity Address:IntersectionofXianboGuRongRoadandZhongying Road,GuraoTown,ChaoyangDistrict,ShantouCity Phone:+8613790880762 Fax:-- Email:[email protected]

ReportNo.:CISRR26012220701 Page 59 of 62 9.EXTERNALANDINTERNALPHOTOS 9.1.ExternalPhotos ReportNo.:CISRR26012220701 Page 60 of 62

Label Size:10mm*5mm FCC ID:2BUKE-YD668 Label Location

ReportNo.:CISRR26012220701 Page 61 of 62 9.2.InternalPhotos ReportNo.:CISRR26012220701 Page 62 of 62 ------Endofthereport----- ANT

ReportNo.:CISRR26012220703 Reporttemplateversion:CISE-TR-001-A0Page:1of5 TESTREPORT RFExposureEvaluation ReportNo.CISRR26012220703 ProjectNo.CISR260122207 FCCID2BUKE-YD668 ApplicantGuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCity Address IntersectionofXianboGuRongRoadandZhongyingRoad,GuraoTown, ChaoyangDistrict,ShantouCity ManufacturerGuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCity Address IntersectionofXianboGuRongRoadandZhongyingRoad,GuraoTown, ChaoyangDistrict,ShantouCity ProductNameBluetoothEarphones Trademark- Model/TypereferenceYD668 ListedModel(s)OHR306，YD606，OHR711 Standard 47CFRPart2.1093 DateofsamplereceiptJanuary22,2026 TestdateJanuary22,2026toJanuary28,2026 IssuedateJanuary28,2026 TestresultComplied Reviewedby:LucasHuang Approvedby:HansHu Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangceTesting TechnologyCo.,Ltd. ReportNo.:CISRR26012220703 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 00January28,2026Original ReportNo.:CISRR26012220703 Reporttemplateversion:CISE-TR-001-A0Page:3of5 3.RADIOSPECIFICATIONDESCRIPTION Bluetooth Supportedtype:BREDRLE-1Mbps LE-2Mbps Note:PleaserefertoRFreportfordetailedtechnicalspecifications 4.SIMULTANEOUSTRANSMISSIONANALYSIS ThedeviceuseasingletransmittermoduleandantennaforBluetooth,cannottransmitsimultaneously. ReportNo.:CISRR26012220703 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 BR&EDR2.4802.76-1.301.462.005.000.49923.00PASS BLE2.480-1.70-1.30-3.00-2.005.000.19873.00PASS Note #1:ThisvaluecomesfromtheRFtestreport. #2:Thisvalueisdeclaredbytheapplicant. #3:EIRP=Maximumoutputpower+Antennagain. #4:Thisvalueisdeclaredbytheapplicant. ReportNo.:CISRR26012220703 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 Antennatyp Manufacturer:HuaZichengTechnology Co.,LTD. Address:5thFloor,BuildingB,No.6,DongcaiIndustrial Park,Gushu,Shenzhen model number：BZ-22 eBipolarAntennas WorkingFrequency2.4~2.5GHz CentralFrequency2450MHz Gain-1.3dBi Impedance50Ohm PassiveTestForBT2.4 FreqEffiEffiGainGain UHI S DHI S MaxMin Directivi ty Beamwid th AttHAttV (MHz ) (%)(dB) (dBi ) (dBd ) (%)(%)(dB)(dB)(dBi)(3dB)(dB)(dB) 2400 30.0 5 -5.2 2 -1.5 4 -3.6 9 00 -1.5 4 -12.0 7 5.2230 47.3 6 46.8 6 2410 30.8 9 -5.1 -1.3 5 -3.500 -1.3 5 -11.5 1 5.13047.446.9 2420 28.6 4 -5.4 3 -1.6 9 -3.8 4 00 -1.6 9 -11.9 2 5.4390 47.2 8 46.7 6 243027.6 -5.5 9 -1.8 5 -400 -1.8 5 -12.4 2 5.5990 47.3 5 46.7 8 2440 30.3 5 -5.1 8 -1.4 8 -3.6 3 00 -1.4 8 -11.8 8 5.1890 47.1 5 46.6 5 2450 32.2 1 -4.9 2 -1.3 -3.4 5 00-1.3 -11.6 6 4.9290 47.3 3 46.8 5 246030.3 -5.1 9 -1.6 4 -3.7 9 00 -1.6 4 -12.2 3 5.1990 47.7 2 47.2 2 2470 28.6 7 -5.4 3 -2.0 6 -4.2 1 00 -2.0 6 -13.0 9 5.43180 47.3 6 46.9 3 2480 30.2 1 -5.2 -1.9 8 -4.1 3 00 -1.9 8 -13.45.2180 47.5 6 47.1 2490 27.5 2 -5.6 -2.5 7 -4.7 2 00 -2.5 7 -14.3 5 5.6180 47.0 5 46.6 7 2500 25.6 5 -5.9 1 -2.9 8 -5.1 3 00 -2.9 8 -14.8 4 5.9190 47.0 1 46.6 3

ReportNo.:CISRR26012220702 Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangce TestingTechnologyCo.,Ltd. Page1of41 TESTREPORT ReportNo.CISRR26012220702 ProjectNo.CISR260122207 FCCID2BUKE-YD668 ApplicantGuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCity Address IntersectionofXianboGuRongRoadandZhongyingRoad,GuraoTown, ChaoyangDistrict,ShantouCity ManufacturerGuraoQuemingElectronicsFactory,ChaoyangDistrict,ShantouCity Address IntersectionofXianboGuRongRoadandZhongyingRoad,GuraoTown, ChaoyangDistrict,ShantouCity ProductNameBluetoothEarphones Trademark- Model/TypereferenceYD668 ListedModel(s) OHR306，YD606，OHR711 Standard 47CFRPart15.247 DateofsamplereceiptJanuary22,2026 TestdateJanuary22,2026toJanuary28,2026 IssuedateJanuary28,2026 TestresultComplied Reviewedby:LucasHuang Approvedby:HansHu ReportNo.:CISRR26012220702 Page 2 of 41 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 6.2.2.6dBBandwidth........................................................................................................................................14 6.2.3.MaximumConductedOutputPower.....................................................................................................15 6.2.4.PowerSpectralDensity..........................................................................................................................16 6.2.5.Conductedbandedgeandspuriousemission...................................................................................17 6.2.6.Radiatedbandedgeemission...............................................................................................................18 6.2.7.RadiatedSpuriousEmission(below1GHz).........................................................................................24 6.2.8.RadiatedSpuriousEmission(Above1GHz)........................................................................................28 7.APPENDIXREPORT......................................................................................................................................36 7.1.ConductedOutputPower.........................................................................................................................36 7.2.6dBBandwidth...........................................................................................................................................37 7.3.PowerSpectralDensity.............................................................................................................................38 7.4.DutyCycle..................................................................................................................................................39 7.5.ConductedSpurious&BandEdgeEmission.........................................................................................40 ReportNo.:CISRR26012220702 Page 3 of 41 1.S…

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ReportNo.:CISRR26012220701 Page 57 of 62 8.TESTSETUPPHOTOS ConductedEmissionatACpowerline Radiatedbandedgeemission RadiatedSpuriousEmission(Above1GHz) ReportNo.:CISRR26012220701 Page 58 of 62 RadiatedSpuriousEmission(below1GHz)