2AOKX-K66Mini Ultra Series Smart Color Screen Touch-Controlled TWS Wireless Ear-Clip Earphones

ShenzhenSwetzSoundTechnologyCo.,Limited Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China AttestationStatements NotCoveredEntityApplicant&NotCoveredEquipment To:FederalCommunicationsCommissionDate:Dec.17,25 7435OaklandMillsRoad, Columbia,MD21046,USA Ref:InformationRequiredbySection2.911(d)(5)(i)&(ii) FCCID:2AOKX-K66 ShenzhenSwetzSoundTechnologyCo.,Limited(“theapplicant”)certifiesthat,asofthedateofthe filingoftheapplication,theapplicantisnotidentifiedontheCoveredList,establishedpursuantto§ 1.50002ofreferencechapter,asanentityproducing“covered”communicationequipment.The equipmentforwhichauthorizationissoughtisnot“covered”telecommunicationsequipmentandvideo surveillanceequipmentproducedbyentitiesidentifiedontheCommission’sCoveredListthatprohibited fromreceivinganequipmentauthorizationpursuanttosection§2.903oftheFCCrules. Sincerelyyours, ApplicantSignature PrintedName:FengYang Title:Manager Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China Tel.:+86-755-28404633 Email:[email protected]

ShenzhenSwetzSoundTechnologyCo.,Limited Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China 1|Page AttestationStatements To:FederalCommunicationsCommissionDate:Dec.17,25 7435OaklandMillsRoad, Columbia,MD21046,USA Subject:AttestationofCompliancewithFCCCoveredListSoftwareRequirements FCCID:[2AOKX-K66] ProductName:[MiniUltraSeriesSmartColorScreenTouch-ControlledTWSWirelessEar-ClipEarphones] 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:FengYang Title:Manager Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China Tel.:+86-755-28404633 Email:[email protected] ShenzhenSwetzSoundTechnologyCo.,Limited Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China 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

ShenzhenSwetzSoundTechnologyCo.,Limited Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China ReferenceNo.2025UD0138 U.S.AgentLetterofAttestation To:FederalCommunicationsCommission 7435OaklandMillsRoad,Columbia,MD21046,USA Date:Dec.17,25 Ref:AttestationStatement–Part2.911(d)(7)filing FCCID:2AOKX-K66 [ShenzhenSwetzSoundTechnologyCo.,Limited](“theapplicant”)certifiesthat,asofthedateof thefilingoftheapplication,[TTSMARKETINC.](“theagent”)isourdesignatedU.S.agentfor serviceofprocessfortheabovereferenceFCCID.Theapplicantacceptstomaintainanagentfor serviceofprocessintheUnitedStatesfornolessthanoneyearaftereitherthegranteehas permanentlyterminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S., ortheconclusionofanyCommission-relatedadministrativeorjudicialproceedinginvolvingthe equipment,whicheverislater.Theapplicantfurtheracknowledgesitisourresponsibilitytoinform theFCCwhenevertheagentinformationchanges. [TTSMARKETINC.]("theagent)understanditistheagent'sobligationtoacceptserviceofprocess intheUnitedStatesformattersrelatedtotheapplicableequipment,andatthephysicalU.S. addressandemailaddress. DesignatedU.S.Agent CompanyName:TTSMARKETINC. FRN:0036806057 GC:N/A Address:1178BroadwaySte324,NewYork,NY 10001.USA Signature: ContactPerson:MaverickLim Tel:001-(646)305-2908Email:[email protected] Applicant CompanyName:ShenzhenSwetzSoundTechnologyCo.,Limited FRN:0027078971 Address:No.19,JianlongStreet,Baoan Community,Yuanshan,LonggangDistrict,Shenzhen, China Signature: ContactPerson:FengYang Tel:ManagerEmail:[email protected]

ShenzhenSwetzSoundTechnologyCo.,Limited Address: No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China (Dec17,2025) FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:ConfidentialityRequestfor:FCCID:2AOKX-K66 PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestpermanent confidentialtreatmentoftheexhibitsaccompanyingthiscertificationapplicationasoutlinedbelow: BlockDiagram  Schematics  OperationalDescription Theaboveexhibitscontaintradesecretsand/orproprietaryinformationthatarenotpubliclyavailableand materialsthattheApplicanthasspentconsiderableeffortsindeveloping.Publicdisclosureofthesemay beharmfultotheApplicantandgiveanunfairadvantagetocompetitorsonthemarket. PursuanttoDA04-1705,theapplicantalsorequeststemporaryconfidentialtreatmentoftheexhibits outlinedbelowforaperiodof(upto180)daysfromthedateofequipmentauthorizationandpriorto marketingintheUnitedStatestopreventtheprematurereleaseofanysensitiveinformation.Applicantis awareoftheirresponsibilitytonotifyDERYCOMintheeventinformationregardingtheproductorthe productismadeavailabletothepublicbeforetherequestedperiodhasexpired. UserManual Sincerely, (Signature) Title:Manager Address:No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China Tel.:+86-755-28404633 Email:[email protected]

ShenzhenSwetzSoundTechnologyCo.,Limited Address: No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen,China (Dec17,2025) FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:AgentAuthorizationforFCCID:2AOKX-K66 I,theundersigned,herebyauthorize(ShenzhenNCTTestingTechnologyCo.,Ltd.)toactonourbehalfin allmattersrelatingtothisapplicationforequipmentcertification. Anyactcarriedoutby(ShenzhenNCTTestingTechnologyCo.,Ltd.)shallhavethesameeffectasour ownandIacknowledgethatallresponsibilityforcomplyingwiththetermsandconditionsofcertification, asspecifiedbyDERYCOMCERTIFICATIONSERVICES,INC.,stillresideswith(ShenzhenSwetzSound TechnologyCo.,Limited). WecertifythatwearenotsubjecttoadenialoffederalbenefitsthatincludesFCCbenefitspursuantto Section5301oftheAnti-DrugAbuseActof1988,21U.S.C.§862,andthatnopartytotheapplication,as definedin47CFR§1.2002(b),issubjecttoadenialoffederalbenefitsthatincludesFCCbenefits pursuanttothatsection. Sincerely, (Signature) (FullnameofcontactpersonlistedonFCC’swebsite)FengYang (Title):Manager Tel:0756-3312625 Fax:+86-755-28404633 Email:[email protected]

ShenzhenSwetzSoundTechnologyCo.,Limited ProductSimilarityDeclaration Productname:MiniUltraSeriesSmartColorScreenTouch- ControlledTWSWirelessEar-ClipEarphones Modelname:K66Ultra,TE528B FCCID:2AOKX-K66 We(ShenzhenSwetzSoundTechnologyCo.,Limited)hereby statethatallthemodelsareelectricalidenticalincludingthesame softwareparameterandhardwaredesign(i.e.,circuitdesign,PCB Layout,RFmodule/circuit,antennatype(s)andantennalocation, componentsonPCB,etc.,),samemechanicalstructureand design(includingproductenclosure,materials,etc.,),theonly differencearemodelnameandcolor. Signature: Name:FengYang Title:Manager Place,date:Shenzhen,2025.12.17

FCCID:2AOKX-K66ExternalPhotos

Model：K66Ultra FCCID:2AOKX-K66

FCCID:2AOKX-K66InternalPhotos ChipANT ChipANT

FCCID:2AOKX-K66 RFExposureEvaluation AccordingtoKDB447498D01GeneralRFExposureGuidancev06andpart2.1093， UnlessspecificallyrequiredbythepublishedRFexposureKDBprocedures,standalone 1-gheadorbodyand10-gextremitySARevaluationforgeneralpopulationexposure conditions,bymeasurementornumericalsimulation,isnotrequiredwhenthe correspondingSARTestExclusionThresholdcondition(s),listedbelow,is(are)satisfied. For100MHzto6GHzandtestseparationdistances≤50mm,the1-gand10-gSARtest exclusionthresholdsaredeterminedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistance, mm)]·[√f (GHz) ]≤3.0for1-gSAR,and≤7.5for10-gextremitySAR,where f (GHz) istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison Here, SoaSARtestisnotrequired ModeFreque ncy (MHz) Max Power (dBm) Target power W/ tolerance (dBm) Maxtune uppower tolerance (dBm) Max Power (mW) Min. Distanc e (mm) Calc. threshol ds limit EDR GFSK 2402-1.05 -1 ± 1 01.00005.000.31003.0 2441-1.80-1±101.00005.000.31253.0 2480-2.65 -2 ± 1 -10.79435.000.25023.0 Π /4-DQ PSK 2402-0.02 0 ± 1 11.25895.000.39023.0 2441-0.750±111.25895.000.39343.0 2480-1.65-1±101.00005.000.31503.0

SymbolsLWTA Dimensions 1.60±0.200.80±0.200.80±0.200.30±0.10 NumberTerminalName ① INPUT ② NC Dimensions(Unit: mm) w ①② ( Side View) ( Bottom View) ( Top View) A T L Shenzhen HanyangAntenna Design Co. Ltd. 1.Bluetooth 2.Dual-band WLAN 3.ISM and UWB 1.Surfacemountedelementwithasmalldimensionof1.6×0.8×0.8mmmeetfutureminiaturizationtrend. 2.EmbeddedandLTCC(lowtemperatureco-firedceramic)technologyisabletointegratewithsystemdesign aswellasbeatifyingthehousingoffinalproduct. 3.Miniaturization,wideband,highstability,lowESR,andlowtolerance. 4.Dual-bandresonancesinthedominantandharmonicmodesenablesmultibandoperations. 5.Novelground-radiationtechniqueenablesradiationfromboththeantennaandthegroundplane. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 Features: Applications: RF chip ANT chipANT pattern PCB ground Mode-2 Mode-1 P/N: HY160808 SRF09 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page1 Layout-1 (3.5mm×6.5mm) ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page2 1.5 1 3.5 2.5 0201 footprint (E1) 0201 footprint (E2) 0603 footprint (ANT) RF Input/Output 6.5 0.5 0.5 0.5 1.5 3.5 2.5 0201 footprint (E3) 6.5 Top layer: Bottom layer: 0.5 0.5 RF chip E1 E3 E2 ANT Equivalentcircuit: P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 2.5 0201 footprint 0603 footprint 10 0.5 1.5 0201 footprint 1.5 3 2.5 10 1.5 2 0.5 0201 footprint Layout-2 (1.5mm×10mm) Top layer: Bottom layer: P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page3 RF Input/Output ElectricalCharacteristics: CharacteristicCurves: FeatureSpecification 1 Centralfrequency2.45GHz 2 Bandwidth>150MHz 3 Peak gain2.78dBi 4 VSWR<2 5 PolarizationLinear 6 AzimuthbeamwidthOmnidirectional 7 Impedance50Ω P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page5 RadiationPattern: Y-ZPlaneX-ZPlane coordinates： 深圳市宝安区前进二路宝运达物流信息大厦12A10/12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page5 RadiationPerformance: P/N: HY160808 SRF07, HY160808 SRF08,HY160808 SRF09 深圳汉阳天线设计有限公司 Shenzhen Hanyang Antenna Design Co. Ltd. X-YPlane Frequency 2400MHz2450MHz2500MHz Avg.gain-1.92-1.35-1.56 Peakgain1.792.782.66 Efficiency74.5580.2576.98 Temperature：40±2°C Humidity：90~95%RH Duration：500h Recovery conditions：Room temperature Recovery Time：24h (Class1) or 48h (Class2) Test Temperature Operating Temperature Temperature RelativeHumidity 25°C±5°C -25°C~+125°C 5~40°C 20~70% Notenoughsolder Weak holding forcemay cause bad connection between the chipandPCB. RecommendedSolderingAmounts The optimal solder fillet amounts forre-flowsoldering 天线厚度 以下 The optimal solder fillet amounts for wavesoldering DependabilityTest Too much solder Cracks tend to occur due to large stress. MoistureProof OptimumSolderAmount forReflowSoldering Solderability At least 95% of the terminal electrode is covered by newsolder. Preheating conditions:80 to 120°C;10~30s. Solder Tem p e r at u r e :2 3 5 ±5°CDuration:2 ±0.5s , Solder Tempe r ature:24 5±5°CDu rat ion:2±0.5s P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page6 10±1S AppliedForce:5NDuration:10±1S Preheating conditions: up-category temperature, 1h Recovery time:24±1h InitialMeasurement Cycling Times: 5 times, 1 cycle, 4steps: Preheating80to120°C;10~30s.SolderTemperature:235±5°C;Duration:2±0.5s;SolderTemperature:245±5°C Duration:2±0.5s;Preheating100to200°C;10±2min. SolderTemperature:265±5°C;Duration:10±1s Cleanthecapacitorwithsolventandexamineitwitha10X(min.)microscope. RecoveryTime:24±2h Recoverycondition:Roomtemperature Test Board: Al 2 O 3 orPCBWarp:1mm Speed:0.5mm/sec. Unit:mm Themeasurementshouldbemadewiththeboardinthe bendingposition. Resistance to Soldering Heat ResistancetoFlexureofSubstrate Temperature CycleTest P/N: HY160808 SRF09 Shenzhen HanyangAntenna Design Co. Ltd. Shenzhen BaoanDistrict Qianjin2 Road BaoYunda logistics information building 12A10 tel：0755-23069700 ShenzhenHanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthis reportandthisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanyperson orfirmwithoutthepriorwrittenconsentofShenzhenHanyangAntennaDesignCo.Ltd. Page7 StageTemperatur…

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Page1of38 FCCID:2AOKX-K66 FCC_BT(Part15.247)TestData Page2of38 TableofContents 1.DutyCycle.................................................................................................................................................................3 2.-20dBBandwidth....................................................................................................................................................6 3.99%OccupiedBandwidth....................................................................................................................................9 4.PeakOutputPower...............................................................................................................................................12 5.SpuriousEmissions...............................................................................................................................................15 6.Bandedge................................................................................................................................................................21 7.CarrierFrequenciesSeparation(Hopping)....................................................................................................29 8.NumberofHoppingChannel(Hopping).......................................................................................................32 9.DwellTime(Hopping).........................................................................................................................................33 Page3of38 1.DutyCycle ConditionAntennaRateFrequency(MHz)Dutycycle(%)Duty_factor NVNTANT11-DH12402.0030.655.14 NVNTANT11-DH12441.0032.264.91 NVNTANT11-DH12480.0031.754.98 NVNTANT12-DH12402.0033.334.77 NVNTANT12-DH12441.0030.655.14 NVNTANT12-DH12480.0031.754.98 Duty_Cycle_NVNT_ANT1_1-DH1_2402 Duty_Cycle_NVNT_ANT1_1-DH1_2441 Duty_Cycle_NVNT_ANT1_1-DH1_2480 Page4of38 Duty_Cycle_NVNT_ANT1_2-DH1_2402 Duty_Cycle_NVNT_ANT1_2-DH1_2441 Page5of38 Duty_Cycle_NVNT_ANT1_2-DH1_2480 Page6of38 2.-20dBBandwidth ConditionAntennaModulationFrequency(MHz)-20dBBW(MHz)iflargerthanCFS NVNTANT11-DH12402.000.877No NVNTANT11-DH12441.000.878No NVNTANT11-DH12480.000.879No NVNTANT12-DH12402.001.246Yes NVNTANT12-DH12441.001.249Yes NVNTANT12-DH12480.001.248Yes -20dB_Bandwidth_NVNT_ANT1_1-DH1_2402_00 -20dB_Bandwidth_NVNT_ANT1_1-DH1_2441_00 -20dB_Bandwidth_NVNT_ANT1_1-DH1_2480_00 Page7of38 -20dB_Bandwidth_NVNT_ANT1_2-DH1_2402_00 -20dB_Bandwidth_NVNT_ANT1_2-DH1_2441_00 Page8of38 -20dB_Bandwidth_NVNT_ANT1_2-DH1_2480_00 Page9of38 3.99%OccupiedBandwidth ConditionAntennaModulationFrequency(MHz)99%%BW(MHz) NVNTANT11-DH12402.000.829 NVNTANT11-DH12441.000.822 NVNTANT11-DH12480.000.823 NVNTANT12-DH12402.001.165 NVNTANT12-DH12441.001.162 NVNTANT12-DH12480.001.161 99%_Occupied_Bandwidth_NVNT_ANT1_1-DH1_2402_00 99%_Occupied_Bandwidth_NVNT_ANT1_1-DH1_2441_00 99%_Occupied_Bandwidth_NVNT_ANT1_1-DH1_2480_00 Page10of38 99%_Occupied_Bandwidth_NVNT_ANT1_2-DH1_2402_00 99%_Occupied_Bandwidth_NVNT_ANT1_2-DH1_2441_00 Page11of38 99%_Occupied_Bandwidth_NVNT_ANT1_2-DH1_2480_00 Page12of38 4.PeakOutputPower ConditionAntennaModulation Frequency (MHz) Max.Conducted Power(dBm) Max.Conducted Power(mW) Limit(mW)Result NVNTANT11-DH12402.00-1.050.791000Pass NVNTANT11-DH12441.00-1.800.661000Pass NVNTANT11-DH12480.00-2.650.541000Pass NVNTANT12-DH12402.00-0.021.00125Pass NVNTANT12-DH12441.00-0.750.84125Pass NVNTANT12-DH12480.00-1.650.68125Pass Peak_Output_Power_NVNT_ANT1_1-DH1_2402_00 Peak_Output_Power_NVNT_ANT1_1-DH1_2441_00 Peak_Output_Power_NVNT_ANT1_1-DH1_2480_00 Page13of38 Peak_Output_Power_NVNT_ANT1_2-DH1_2402_00 Peak_Output_Power_NVNT_ANT1_2-DH1_2441_00 Page14of38 Peak_Output_Power_NVNT_ANT1_2-DH1_2480_00 Page15of38 5.SpuriousEmissions ConditionAntennaModulationTXModeRef_level(dBm) Spurious MAX.Value(dBm) LimitResult NVNTANT11-DH12402.00-1.172-39.558-21.172Pass NVNTANT11-DH12441.00-1.979-35.113-21.979Pass NVNTANT11-DH12480.00-2.797-35.137-22.797Pass NVNTANT12-DH12402.00-1.142-39.229-21.142Pass NVNTANT12-DH12441.00-1.910-34.928-21.910Pass NVNTANT12-DH12480.00-2.795-34.787-22.795Pass 1_Reference_Level_NVNT_ANT1_1-DH1_2402_00 2_Spurious_Emissions_NVNT_ANT1_1-DH1_2402_00 1_Reference_Level_NVNT_ANT1_1-DH1_2441_00 Page16of38 2_Spurious_Emissions_NVNT_ANT1_1-DH1_2441_00 1_Reference_Level_NVNT_ANT1_1-DH1_2480_00 Page17of38 2_Spurious_Emissions_NVNT_ANT1_1-DH1_2480_00 1_Reference_Level_NVNT_ANT1_2-DH1_2402_00 Page18of38 2_Spurious_Emissions_NVNT_ANT1_2-DH1_2402_00 1_Reference_Level_NVNT_ANT1_2-DH1_2441_00 Page19of38 2_Spurious_Emissions_NVNT_ANT1_2-DH1_2441_00 1_Reference_Level_NVNT_ANT1_2-DH1_2480_00 Page20of38 2_Spurious_Emissions_NVNT_ANT1_2-DH1_2480_00 Page21of38 6.Bandedge ConditionAntennaModulationTXModeRef_level(dBm)BandedgeMAX.ValueLimitResult NVNTANT11-DH12402.00-1.172-51.862-21.172Pass NVNTANT11-DH1Hopping_LCH-1.100-58.234-21.100Pass NVNTANT11-DH12480.00-2.797-63.339-22.797Pass NVNTANT11-DH1Hopping_HCH-1.360-62.642-21.360Pass NVNTANT12-DH12402.00-1.142-51.907-21.142Pass NVNTANT12-DH1Hopping_LCH-1.010-54.788-21.010Pass NVNTANT12-DH12480.00-2.795-62.738-22.795Pass NVNTANT12-DH1Hopping_HCH-1.309-62.646-21.309Pass 1_Reference_Level_NVNT_ANT1_1-DH1_2402_00 2_Bandedge_NVNT_ANT1_1-DH1_2402_00 1_Reference_Level_Hopping_NVNT_ANT1_1-DH1_Hopping Page22of38 2_Band_Edge_(Hopping)_NVNT_ANT1_1-DH1_Hopping 1_Reference_Level_NVNT_ANT1_1-DH1_2480_00 Page23of38 2_Bandedge_NVNT_ANT1_1-DH1_2480_00 1_Reference_Level_Hopping_NVNT_ANT1_1-DH1_Hopping Page24of38 2_Band_Edge_(Hopping)_NVNT_ANT1_1-DH1_Hopping 1_Reference_Level_NVNT_ANT1_2-DH1_2402_00 Page25of38 2_Bandedge_NVNT_ANT1_2-DH1_2402_00 1_Reference_Level_Hopping_NVNT_ANT1_2-DH1_Hopping Page26of38 2_Band_Edge_(Hopping)_NVNT_ANT1_2-DH1_Hopping 1_Reference_Level_NVNT_ANT1_2-DH1_2480_00 Page27of38 2_Bandedge_NVNT_ANT1_2-DH1_2480_00 1_Reference_Level_Hopping_NVNT_ANT1_2-DH1_Hopping Page28of38 2_Band_Edge_(Hopping)_NVNT_ANT1_2-DH1_Hopping Page29of38 7.CarrierFrequenciesSeparation(Hopping) ConditionAntennaModulationFrequency(MHz) Hopping N…

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Page1of36 Hotline:400-8868-419http://www.ncttesting.cn FCCTESTREPORT FCCID:2AOKX-K66 Product: MiniUltraSeriesSmartColor ScreenTouch-ControlledTWS WirelessEar-ClipEarphones ModelName:K66Ultra,TE528B Brand: ReportNo.:NCT25044955XE1-1 Preparedfor ShenzhenSwetzSoundTechnologyCo.,Limited No.19,JianlongStreet,BaoanCommunity,Yuanshan,LonggangDistrict,Shenzhen, China Preparedby ShenzhenNCTTestingTechnologyCo.,Ltd. A101&2FB2,Fuqiao6thArea,XintianCommunity,FuhaiStreet,BaoanDistrict, Shenzhen,People’sRepublicofChina TEL:400-8868-419 ReportNo.:NCT25044955XE1-1 Page2of36 Hotline:400-8868-419http://www.ncttesting.cn 1TESTRESULTCERTIFICATION Applicant’sname:ShenzhenSwetzSoundTechnologyCo.,Limited Address: No.19,JianlongStreet,BaoanCommunity,Yuanshan,Longgang District,Shenzhen,China Manufacture'sname :ShenzhenSwetzSoundTechnologyCo.,Limited Address : No.19,JianlongStreet,BaoanCommunity,Yuanshan,Longgang District,Shenzhen,China Productname : MiniUltraSeriesSmartColorScreenTouch-ControlledTWSWireless Ear-ClipEarphones Modelname :K66Ultra Additionalmodel :TE528B Standards :FCCCFR47Part15Section15.247 Testprocedure :ANSIC63.10:2020 TestDate:Oct.30,2025toDec.04,2025 DateofIssue:Dec.04,2025 TestResult :Pass ThisdevicedescribedabovehasbeentestedbyNCT,andthetestresultsshowthatthe equipmentundertest(EUT)isincompliancewiththeFCCrequirements.Anditisapplicableonly tothetestedsampleidentifiedinthereport. Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofNCT,this documentmaybealteredorrevisedbyNCT,personalonly,andshallbenotedintherevisionof thedocument. TestEngineer: KevenWu/Engineer TechnicalManager: HenryWang/Manager ReportNo.:NCT25044955XE1-1 Page3of36 Hotline:400-8868-419http://www.ncttesting.cn Contents Page 1TESTRESULTCERTIFICATION...................................................................................................................2 2TESTSUMMARY............................................................................................................................................5 3TESTFACILITY...............................................................................................................................................6 4GENERALINFORMATION.............................................................................................................................7 4.1GENERALDESCRIPTIONOFE.U.T..........................................................................................................7 4.2CHANNELLIST.......................................................................................................................................8 4.3TESTSETUPCONFIGURATION................................................................................................................9 4.4TESTCONFIGURATION............................................................................................................................9 5EQUIPMENTDURINGTEST........................................................................................................................10 5.1EQUIPMENTSLIST................................................................................................................................10 5.2MEASUREMENTUNCERTAINTY..............................................................................................................12 5.3DESCRIPTIONOFSUPPORTUNITS........................................................................................................12 6CONDUCTEDEMISSION.............................................................................................................................13 6.1E.U.T.OPERATION..............................................................................................................................13 6.2EUTSETUP.........................................................................................................................................13 6.3TESTSET-UP(BLOCKDIAGRAMOFCONFIGURATION).........................................................................13 6.4MEASUREMENTPROCEDURE:...............................................................................................................14 6.5CONDUCTEDEMISSIONLIMIT................................................................................................................14 6.6MEASUREMENTDESCRIPTION...............................................................................................................14 6.7CONDUCTEDEMISSIONTESTRESULT...................................................................................................14 7RADIATEDSPURIOUSEMISSIONS...........................................................................................................17 7.1EUTOPERATION.................................................................................................................................17 7.2TESTSETUP........................................................................................................................................18 7.3SPECTRUMANALYZERSETUP...............................................................................................................19 7.4TESTPROCEDURE...............................................................................................................................20 7.5SUMMARYOFTESTRESULTS...............................................................................................................21 8MAXIMUMPEAKOUTPUTPOWERTEST.................................................................................................29 8.1TESTSTANDARDANDLIMIT..................................................................................................................29 8.2TESTSETUP........................................................................................................................................29 8.3TESTPROCEDURE...............................................................................................................................29 8.…

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FCCID:2AOKX-K66