2BQID-YS-MT21Bluetooth audio amplifier board

Rev1/26/2023 ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:2026-8-14 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:2BQID-YS-MT21 (“ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD”)certifiesthattheequipmentforwhich authorizationissoughtisnot“covered”equipmentprohibitedfromreceivinganequipment authorizationpursuanttosection2.903oftheFCCrules. (“ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD”)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)LiNanQiao (Applicantprintedname) Rev1/26/2023 ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:2026-8-14 Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:2BQID-YS-MT21 (“ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD”)certifiesthat,asofthedateofthe filingoftheapplication,ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTDisnotidentifiedon theCoveredList(asaspecificallynamedentityoranyofitssubsidiariesoraffiliates)asanentity producing“covered”equipment. Sincerely, (Applicantsignature) (Applicantprintedname)LiNanQiao

ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD 2.911(d)(7)USAAgentv1.4 Section2.911(d)(7)USAAgentforServiceofProcess Companyname:ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD Address:23rdFloor,Unit1,HepingTimesPlaza,No.19HepingRoad,Qinghua Community,LonghuaSubdistrict,LonghuaDistrict,Shenzhen,Guangdong,China ProductName:Bluetoothaudioamplifierboard FCCID:2BQID-YS-MT21 Model(s):YS-MT21,YS-TB21 2.911(d)(7)USADesignatedAgentforServiceofProcess We,[ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD](“the applicant”)designate[CELLTINC.]NOTE1forthepurposeofacceptingserviceof processonbehalfoftheapplicant. Applicantconsent:WeAcknowledgeourconsenttoacceptserviceofprocessinthe UnitedStatesformattersrelatedtotheapplicableequipment,andatthephysicalU.S. addressandemailaddressofthedesignatedagentandacknowledgeour acceptanceofourobligationtomaintainanagentforserviceofprocessintheUnited Statesfornolessthanoneyearaftereitherthegranteehaspermanentlyterminated allmarketingandimportationoftheapplicableequipmentwithintheU.S.,orthe conclusionofanyCommission-relatedadministrativeorjudicialproceedinginvolving theequipment,whicheverislater. Agentobligation:WeAcknowledgeourobligationtoacceptserviceofprocessinthe UnitedStatesformattersrelatedtotheapplicableequipmentatourphysicalU.S. addressandemailaddressfornolessthanoneyearaftereitherthegranteehas permanentlyterminatedallmarketingandimportationoftheapplicableequipment withintheU.S.,ortheconclusionofanyCommission-relatedadministrativeorjudicial proceedinginvolvingtheequipment,whicheverislater. USAAgent Companyname:CELLTINC. Address:140121STST#12958 SACRAMENTO,CA95811,USA Applicant Companyname:ShenzhenZhongchuang SpaceElectronicTechnologyCo.,LTD Address:23rdFloor,Unit1,HepingTimes Plaza,No.19HepingRoad,Qinghua Community,LonghuaSubdistrict,Longhua District,Shenzhen,Guangdong,China ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD 2.911(d)(7)USAAgentv1.4 FRN:0036412567 ContactName:ThompsonLim TelephoneNo:001-424-3474188 Email:[email protected] FRN:0037196516 FCCGranteeCode:2BQID ContactName:LiNanQiao TelephoneNo:13538214502 Email:[email protected] Signature: Title:Manager Signature: Title:Engineer Date:2026-8-14Date:2026-8-14 NOTE1:AnapplicantlocatedintheUnitedStatesmaydesignateitselfastheagentforservice ofprocess. Reference;FederalRegisterdocument2022-28263publishedon02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-nation al-security-threats-to-the-communications-supply-chain-through-the

ShenzhenZhongchuangSpaceElectronic TechnologyCo.,LTD Familymodelsdeclarationletter August14,2026 We ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD Of 23rdFloor,Unit1,HepingTimesPlaza,No.19HepingRoad,QinghuaCommunity,Longhua Subdistrict,LonghuaDistrict,Shenzhen, Guangdong,China Declareunderoursoleresponsibilitythattheproduct FCCID:2BQID-YS-MT21 Product:Bluetoothaudioamplifierboard ModelNumber:YS-MT21,YS-TB21 AllthemodelsarethesamecircuitandRFmodule,exceptthemodel name. LiNanQiao/Engineer E-mail:[email protected] Phone:13538214502 Fax:13538214502 Address: 23rdFloor,Unit1,HepingTimesPlaza,No.19HepingRoad,Qinghua Community,LonghuaSubdistrict,LonghuaDistrict,Shenzhen, Guangdong,China

ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD Date:2026-8-14 Product/ModelNumber:Bluetoothaudioamplifierboard/YS-MT21,YS- TB21 FCCID:2BQID-YS-MT21 Towhomitmayconcern, Re:ProductCertificationRepresentativeAuthorizationLetter WeauthorizeQAILaboratoriesLtd.3980NorthFraserWay,BurnabyB.C. CanadaV5J5K5toactonourbehalfonallmattersconcerningtheabove namedequipment. Thisshallincludethefollowing: Testing Approvalapplicationsandprocedures WedeclarethatQAILaboratoriesLtd.isallowedtoforwardallinformation relatedtotheapprovalprojecttotheappliedcertificationbodyandtothe notificationentitiesandtodiscussanyissuesconcerningtheapproval application.AnyandallactscarriedoutbyQAILaboratoriesLtd.onour behalfshallhavethesameeffectasactsofourown. By:LiNanQiao ContactListedonFCCWesbite Title:Engineer Email:[email protected] Telephone:13538214502 Onbehalfof:ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD

ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:August14,2026 Subject;RequestforConfidentiality FCCID:2BQID-YS-MT21 ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthese documentsmightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantage inthemarket. SchematicDiagram BlockDiagram PartsList OperationalDescription Tune-upProcedure SoftwareSecurityRequirementsforUNIIdevices Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulations inTitle47CFR§2.803andtheimportationrulesinTitle47CFR§2.1204,whileensuringthat businesssensitiveinformationremainsconfidentialuntiltheactualmarketingofnewly authorizeddevices,werequestShortTermConfidentialityofthefollowingattachment(s); ExternalPhotos TestSetupPhotos InternalPhotos UserManual For45days,pursuanttoPublicNoticeDA04-1705. OR For180dayspursuanttoKDB726920D01. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondenceduringthecertificationreviewprocesscannotbegrantedasconfidential documentsandthisinformationwillbeavailableforpublicreviewoncethegrantofequipment authorizationisissued. Sincerely, Signature: Name:LiNanQiao Title:Engineer

FCCID:2BQID-YS-MT21 Size:40mm*5mm

FCCID:2BQID-YS-MT21 RFExposureEvaluation AccordingtoKDB447498D01GeneralRFExposureGuidancev06andpart2.1091，Unlessspecifically requiredbythepublishedRFexposureKDBprocedures,standalone1-gheadorbodyand10-gextremity SARevaluationforgeneralpopulationexposureconditions,bymeasurementornumericalsimulation,isnot requiredwhenthecorrespondingSARTestExclusionThresholdcondition(s),listedbelow,is(are)satisfied. Limits Thecriterialistedinthefollowingtableshallbeusedtoevaluatetheenvironmentimpactofhumanexposure toradiofrequency(RF)radiationasspecifiedin1.1307(b) LimitsforMaximumPermissibleExposure(MPE) Frequencyrange (MHz) Electricfield strength (V/m) Magneticfieldstrength (A/m) Powerdensity (mW/cm 2 ) Averagingtime (minutes) (A)LimitsforOccupational/ControlledExposures 0.3–3.06141.63*(100)6 3.0–301842/f4.89/f*(900/f 2 )6 30–30061.40.1631.06 300–1500f/3006 1500–100,00056 (B)LimitsforGeneralPopulation/UncontrolledExposure 0.3–1.346141.63*(100)30 1.34–30824/f2.19/f*(180/f 2 )30 30–30027.50.0730.230 300–1500f/150030 1500–100,0001.030 f=frequencyinMHz Friistransmissionformula:Pd=(Pout*G)/(4*pi*r 2 ) Where Pd=powerdensityinmW/cm 2 ,Pout=outputpowertoantennainmW; G=gainofantennainlinearscale,Pi=3.1416; R=distancebetweenobservationpointandcenteroftheradiatorincm PdidthelimitofMPE,1mW/cm 2 .Ifweknowthemaximumgainoftheantennaandthetotalpowerinputto theantenna,throughthecalculation,wewillknowthedistancerwheretheMPElimitisreached. TestProcedure SoftwareprovidedbyclientenabledtheEUTtotransmitandreceivedataatlowest,middleandhighest channelindividually. TestResultofRFExposureEvaluation SoaSARtestisnotrequired Operating Mode Frequency Measured Power Tuneup tolerance Max.Tune upPower Antenna Gain Power Densityat R=20cm Power Density Limit Result (MHz)(dBm)(dBm)(dBm)(dBi)(mW/cm 2 )(mW/cm 2 ) BT-8DPSK2402-24800.93 0±1 1-0.580.0002191.0PASS

Summary Inverted F Antenna Specification ITEMANT SPEC Model Name2.4G ANT Operation frequency2402-2480MHz Antenna TypePCB antenna Center Frequency HorizontalVertical 2400MHz2400MHz2500MHz2400MHz2400MHz2500MHz -1.26dBi-0.76dBi-0.58dBi-5.25dBi-2.46dBi-1.86dBi MAX. Gain-0.58dBi PolarizationHorizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance50 Ohm Antenna Length 14.40mm Manufacture Shenzhen Zhongchuang Space Electronic Technology Co., LTD Address 23rd Floor,Unit 1,Heping Times Plaza,No.19 Heping Road,Qinghua Community,Longhua Subdistrict, Longhua District,Shenzhen, Guangdong, China AntennaPhoto & Length (mm) Linewidthofwidetracks:0.9MM Line widthof narrow tracks:0.5MM This section is equivalent and can be calculated independently. Horizontal:2400 MHz 2450 MHz 2500 MHz Power(dBm) Max: 0 Min: -40 Scale:5/div Frequency (MHz) Gain(dBi) MaxMinAvg 2400-1.26174-30.0801-7.18716 2450-0.765802-36.5604-7.48023 2500-0.585582-22.0315-6.59127 Vertical:2400 MHz2450 MHz2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Frequency (MHz) Gain(dBi) MaxMinAvg 2400-5.2537-22.1424-12.4294 2450-2.4652-24.5837-10.4702 2500-1.86120-29.5214-9.20432

ShenzhenNTTTestingTechnologyCo.,Ltd.ReportNo.:SZNTT26026214E1-1 SZNTT-TR838-0Tel:0755-27889935Web:http://www.ntt-testing.comPage1of29 TESTREPORT Applicant:ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD Address: 23rdFloor,Unit1,HepingTimesPlaza,No.19HepingRoad,Qinghua Community,LonghuaSubdistrict,LonghuaDistrict,Shenzhen, Guangdong,China Manufacturer:ShenzhenZhongchuangSpaceElectronicTechnologyCo.,LTD Address: 23rdFloor,Unit1,HepingTimesPlaza,No.19HepingRoad,Qinghua Community,LonghuaSubdistrict,LonghuaDistrict,Shenzhen, Guangdong,China ProductName:Bluetoothaudioamplifierboard ModelNumber:YS-MT21,YS-TB21 Trademark:N/A FCCID:2BQID-YS-MT21 TestDate:Jun.25,2026toJul.15,2026 DateofReport:Jul.16,2026 TestResult: ThisdevicedescribedabovehasbeentestedbyNTT,andthetest resultsshowthattheequipmentundertest(EUT)isincompliance withtheStandardrequirements.Anditisapplicableonlytothetested sampleidentifiedinthereport. TestProcedureUsed: Standards:FCCCFRTitle47Part15SubpartCSection15.247 ANSIC63.10-2020+Cor.1-2023+C63.10a-2024+Erratato C63.10a-2024 KDB558074D0115.247MeasGuidancev05r02 Preparedby(TestEngineer): CindyQin Reviewer(Supervisor): KenWu Approved(Manager): AbelYu ShenzhenNTTTestingTechnologyCo.,Ltd.ReportNo.:SZNTT26026214E1-1 SZNTT-TR838-0Tel:0755-27889935Web:http://www.ntt-testing.comPage2of29 TABLEOFCONTENT 1.GeneralInformation......................................................................................5 1.1.DescriptionofDevice(EUT).......................................................................................................................5 1.2.ChannelList..................................................................................................................................................5 1.3.Summaryoftestresult................................................................................................................................6 1.4.SpecialAccessoriesandAuxiliaryEquipment........................................................................................6 1.5.Testmode......................................................................................................................................................6 1.6.Testconfiguration.........................................................................................................................................6 1.7.BlockDiagram...............................................................................................................................................7 1.8.TestConditions.............................................................................................................................................7 1.9.MeasurementUncertainty(95%confidencelevels,k=2)......................................................................8 1.10.TestFacility..................................................................................................................................................8 1.11.TestEquipment...........................................................................................................................................9 2.Conductedemissionatthemainsterminalstest....................................11 2.1.Limit..............................................................................................................................................................11 2.2.TestSetup....................................................................................................................................................11 2.3.TestProcedure............................................................................................................................................11 2.4.TestResult...................................................................................................................................................11 3.RadiatedSpuriousEmissions...................................................................12 3.1.Limit..............................................................................................................................................................12 3.2.TestSetup....................................................................................................................................................13 3.3.TestProcedure............................................................................................................................................15 3.4.TestResult...................................................................................................................................................16 4.MaximumPeakOutputPower....................................................................22 4.1.Limit..............................................................................................................................................................22 4.2.TestSetup....................................................................................................................................................22 4.3.TestProcedure............................................................................................................................................22 4.4.TestResult...................................................................................................................................................22 5.-20dBBandwidthMeasurement...............................................................23 5.1.Limit..............................................................................................................................................................23 5.2.TestSetup....................................................................................................................................................23 5.3.TestProcedure............................................................................................................................................23 5.4.TestResult..........................…

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Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page1of68 RF Test Data Duty Cycle........................................................................................................................................................................ 2 Maximum Peak Conducted Output Power.......................................................................................................................8 -20dB Bandwidth............................................................................................................................................................14 Occupied Channel Bandwidth........................................................................................................................................20 Carrier Frequencies Separation.....................................................................................................................................26 Number of Hopping Channel..........................................................................................................................................32 Band Edge......................................................................................................................................................................35 Band Edge(Hopping)......................................................................................................................................................42 Conducted RF Spurious Emission................................................................................................................................. 49 Dwell Time......................................................................................................................................................................59 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page2of68 Duty Cycle ConditionModeFrequency (MHz)AntennaDuty Cycle (%)Correction Factor (dB)1/T (kHz) NVNT 1-DH12402Ant130.155.212.65 NVNT 1-DH12441Ant130.165.212.65 NVNT 1-DH12480Ant130.125.212.66 NVNT 2-DH12402Ant131.315.042.55 NVNT 2-DH12441Ant131.285.052.56 NVNT 2-DH12480Ant131.315.042.55 NVNT 3-DH12402Ant131.035.082.58 NVNT 3-DH12441Ant131.045.082.58 NVNT 3-DH12480Ant1315.092.58 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page3of68 Duty Cycle NVNT 1-DH1 2402MHz Ant1 Duty Cycle NVNT 1-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page4of68 Duty Cycle NVNT 1-DH1 2480MHz Ant1 Duty Cycle NVNT 2-DH1 2402MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page5of68 Duty Cycle NVNT 2-DH1 2441MHz Ant1 Duty Cycle NVNT 2-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page6of68 Duty Cycle NVNT 3-DH1 2402MHz Ant1 Duty Cycle NVNT 3-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page7of68 Duty Cycle NVNT 3-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page8of68 Maximum Peak Conducted Output Power ConditionModeFrequency (MHz) AntennaConducted Power (dBm) Conducted Power (W) Limit Conducted(dBm) Verdict NVNT 1-DH12402Ant1-0.640.0008621Pass NVNT 1-DH12441Ant1-0.430.0009121Pass NVNT 1-DH12480Ant1-0.390.0009121Pass NVNT 2-DH12402Ant10.120.0010321Pass NVNT 2-DH12441Ant10.380.0010921Pass NVNT 2-DH12480Ant10.390.0010921Pass NVNT 3-DH12402Ant10.750.0011921Pass NVNT 3-DH12441Ant10.90.0012321Pass NVNT 3-DH12480Ant10.930.0012421Pass Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page9of68 Peak Power NVNT 1-DH1 2402MHz Ant1 Peak Power NVNT 1-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page10of68 Peak Power NVNT 1-DH1 2480MHz Ant1 Peak Power NVNT 2-DH1 2402MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page11of68 Peak Power NVNT 2-DH1 2441MHz Ant1 Peak Power NVNT 2-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page12of68 Peak Power NVNT 3-DH1 2402MHz Ant1 Peak Power NVNT 3-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page13of68 Peak Power NVNT 3-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page14of68 -20dB Bandwidth ConditionModeFrequency (MHz) Antenna-20 dB Bandwidth (MHz) Verdict NVNT 1-DH12402Ant10.9899Pass NVNT 1-DH12441Ant11.025Pass NVNT 1-DH12480Ant11.03Pass NVNT 2-DH12402Ant11.279Pass NVNT 2-DH12441Ant11.28Pass NVNT 2-DH12480Ant11.276Pass NVNT 3-DH12402Ant11.254Pass NVNT 3-DH12441Ant11.245Pass NVNT 3-DH12480Ant11.256Pass Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page15of68 -20dB Bandwidth NVNT 1-DH1 2402MHz Ant1 -20dB Bandwidth NVNT 1-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page16of68 -20dB Bandwidth NVNT 1-DH1 2480MHz Ant1 -20dB Bandwidth NVNT 2-DH1 2402MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page17of68 -20dB Bandwidth NVNT 2-DH1 2441MHz Ant1 -20dB Bandwidth NVNT 2-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page18of68 -20dB Bandwidth NVNT 3-DH1 2402MHz Ant1 -20dB Bandwidth NVNT 3-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page19of68 -20dB Bandwidth NVNT 3-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page20of68 Occupied Channel Bandwidth ConditionModeFrequency (MHz)Antenna99% OBW (MHz) NVNT1-DH12402Ant10.90538 NVNT1-DH12441Ant10.9456 NVNT1-DH12480Ant10.97016 NVNT2-DH12402Ant11.1801 NVNT2-DH12441Ant11.2088 NVNT2-DH12480Ant11.2186 NVNT3-DH12402Ant11.1822 NVNT3-DH12441Ant11.1849 NVNT3-DH12480Ant11.1917 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page21of68 OBW NVNT 1-DH1 2402MHz Ant1 OBW NVNT 1-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page22of68 OBW NVNT 1-DH1 2480MHz Ant1 OBW NVNT 2-DH1 2402MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page23of68 OBW NVNT 2-DH1 2441MHz Ant1 OBW NVNT 2-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page24of68 OBW NVNT 3-DH1 2402MHz Ant1 OBW NVNT 3-DH1 2441MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page25of68 OBW NVNT 3-DH1 2480MHz Ant1 Report No.:SZNTT26026214E1-1 SZNTT-TR728-0Page26of68 Carrier Frequencies Separation ConditionModeAntennaHopping Freq1 (MHz) Hopping Freq2 (MHz) HFS (MHz) Limit (MHz) Verdict NVNT 1-DH1 Ant12401.8082402.991.1820.66Pass NVNT 1-DH1 Ant12441.0322442.0020.970.6…

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