2ALN9-TW91Truly Wireless Earphones

Rev11/20/07 (TRANSTYLETECHNOLOGYCO.,LIMITED) FederalCommunicationsCommission AuthorizationandEvaluationDivision ConfidentialityRequestregardingapplicationforcertificationofFCCID:2ALN9-TW91 PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestconfidential treatmentofinformationaccompanyingthisapplicationasoutlinedbelow: ExhibitTypeFileName BlockDiagram, Schematics, OperationalDescription BlockDiagram Schematics OperationalDescription Theabovematerialscontaintradesecretsandproprietaryinformationnotcustomarilyreleasedto thepublic.Thepublicdisclosureofthesematerialsmaybeharmfultotheapplicantandprovide unjustifiedbenefitstoitscompetitors. TheapplicantunderstandsthatpursuanttoSection0.457oftheRules,disclosureofthis applicationandallaccompanyingdocumentationwillnotbemadebeforethedateoftheGrant forthisapplication. Sincerely, (ScottZhang)

TRANSTYLETECHNOLOGYCO.,LIMITED ModelDifference Productdescription:TrulyWirelessEarphones Modelname:TW91 MZX5100,MZX5100-CGRY,MZX5100-ICY,MZX5100-PP,MZX5100-MT,MZX5100- RYB,MZX5100-WHT,MZX5100-CGRY-STK-6,MZX5100-ICY-STK-6,MZX5100-PP- STK-6,MZX5100-MT-STK-6,MZX5100-RYB-STK-6,MZX5100-WHT-STK-6, MZX5100-CGRY-WM,MZX5100-ICY-WM,MZX5100-PP-WM,MZX5100-MT-WM, MZX5100-RYB-WM,MZX5100-WHT-WM,MZX5100-CGRY-TA,MZX5100-MT-TA, MZX5100-PP-TA,MZX5100-RYB-TA,MZX5100-ICY-TA,MZX5100-WHT-TA, MZX5100-CGRY-FR,MZX5100-CGRY-SA,MZX5100-WHT-SA,MZX5100-CGRY- STK,MZX5100-MT-FR,MZX5100-MT-SA,MZX5100-MT-STK,MZX5100-RYB-FR, MZX5100-RYB-SA,MZX5100-RYB-STK,MZX5100-PP-FR,MZX5100-WHT-FR, MZX5100-WHT-STK,MZX5100-PP-SA,MZX5100-PP-STK,MZX5100-ICY-FR, MZX5010-ICY-SA,MZX5100-ICY-STK TradeName:N/A FCCID:2ALN9-TW91 AllthemodelarethesamecircuitandRFmodule,exceptmodelnames. Regards Sincerely Client’ssignature: Client’sname/title:ScottZhang/N/A Contactinformation/address:1#Building,DabuxiangIndustrialArea,GuanlanTown, LonghuaNewdistrict,ShenzhenChina.518110

(TRANSTYLETECHNOLOGYCO.,LIMITED) FederalCommunicationsCommission AuthorizationandEvaluationDivision 1435OaklandMillsRoad Columbia,MD21046 Date:2020.07.06 SUBJECT:FCCApplicationforFCCID:2ALN9-TW91 ToWhomItMayConcern: We,theundersigned,herebyauthorizeAlanMeiatShenzhenBCTCTestingCo.,Ltd.on ourbehalf,toapplytotheFederalCommunicationsCommissiononourequipment.Any andallactscarriedoutbyAlanMeiofShenzhenBCTCTestingCo.,Ltd.onourbehalf shallhavethesameeffectasactsofourown. ThisistoadvisethatweareinfullcompliancewiththeAnti-DrugAbuseAct.We,the applicant,arenotsubjecttoadenialoffederalbenefitspursuanttoSection5301ofthe Anti-DrugActof1988,21USC853a,andnopartytotheapplicationissubjecttoadenial offederalbenefitspursuanttothatsection. Regards, (ScottZhang)

Label&labellocation Thepermanentlabelisonthemanual,andthetemporarylabelisasshownin thefigure. TrulyWirelessEarphones FCCID:2ALN9-TW91

InternalPhotos Antenna

RFEXPOSUREEVALUATIONMETHOD FCCID:2ALN9-TW91 Applicablestandard： InaccordancewithFCC47CFRpart2(2.1093)thisdevicehasbeendefinedasaportable devicewhichisdefinedasatransmittingdevicedesignedtobeusedsothattheradiating structure(s)ofthedeviceis/arewithin20centimetersofthebodyoftheuser. PortabledevicesmustbeevaluatedusingthespecifiedinFCC47CFRpart2(2.1093)and ANSI/IEEEC95.1-1992.andhadbeentestedinaccordancewiththemeasurementmethods andproceduresspecifiedinIEEE1528-2003. PerFCCKDB447498D01v06,the1-gand10-gSARtestexclusionthresholdsfor100MHz to6GHzattestseparationdistancess50mmaredeterminedby: SARTestExclusionThresholdsfor100MHz – 6GHzand ≤ 50mm ApproximateSARTestExclusionPowerThresholdsatSelectedFrequenciesandTestSeparation DistancesareillustratedinthefollowingTable. The1-gand10-gSARtestexclusionthresholdsfor100MHzto6GHzattestseparation distances ≤ 50mmaredeterminedby: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistance, mm)] · [ √ f(GHz)] ≤ 3.0for1-gSARand ≤ 7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison Thetestexclusionsareapplicableonlywhentheminimumtestseparationdistanceis ≤ 50 mmandfortransmissionfrequenciesbetween100MHzand6GHz.Whentheminimumtest separationdistanceis<5mm,adistanceof5mmisappliedtodetermineSARtest exclusion. BT maxpossibleoutputpower(PK,conducted)tuneup：3dBm 1.1dBilogarithmictermsconverttonumericresultisnearly1.288 3dBm=2.00mW 2402MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=2.00/5*√2.402=0.62≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. Modulation Frequency (MHz) OutputPower (dBm) MaxAntenna Gain(dBi) GFSK24021.333 1.1 GFSK 24411.578 1.1 GFSK 24801.259 1.1 Pi/4DQPSK 24020.752 1.1 Pi/4DQPSK 24411.085 1.1 Pi/4DQPSK 24800.735 1.1 8DPSK 24021.391 1.1 8DPSK 24411.586 1.1 8DPSK24801.312 1.1 2441MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=2.00/5*√2.441=0.62≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2480MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=2.00/5*√2.48=0.63≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. Conclusion:NoSARisrequired.

No.：BCTC/RF-EMC-007Page: 1 of 69 Edition：A.3 TESTREPORT ShenzhenBCTCTestingCo.,Ltd. ReportNo.:BCTC2103239878E Applicant:TRANSTYLETECHNOLOGYCO.,LIMITED ProductName:TrulyWirelessEarphones Model/Type reference: TW91 TestedDate:2021-03-03to2021-03-15 IssuedDate:2021-03-15 ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 2 of 69 Edition：A.3 FCCID:2ALN9-TW91 Thetestreportiseffectiveonlywithbothsignatureandspecializedstamp.Thisresult(s)showninthisreport referonlytothesample(s)tested.WithoutwrittenapprovalofShenzhenBCTCTestingCo.,Ltd,thisreport can’tbereproducedexceptinfull.Thetestedsample(s)andthesampleinformationareprovidedbythe client. ProductName: TrulyWirelessEarphones Trademark:N/A Model/Typereference: TW91 Refertosection4.1 PreparedFor:TRANSTYLETECHNOLOGYCO.,LIMITED Address: 1#Building,DabuxiangIndustrialArea,GuanlanTown, LonghuaNewdistrict,ShenzhenChina.518110 Manufacturer:TRANSTYLETECHNOLOGYCO.,LIMITED Address: 1#Building,DabuxiangIndustrialArea,GuanlanTown, LonghuaNewdistrict,ShenzhenChina.518110 PreparedBy:ShenzhenBCTCTestingCo.,Ltd. Address: 1-2/F.,BuildingB,PengzhouIndustrialPark,No.158,Fuyuan 1stRoad,Tangwei,FuhaiSubdistrict,Bao'anDistrict, Shenzhen,Guangdong,China SampleReceivedDate:2021-03-03 SampletestedDate:2021-03-03to2021-03-15 IssueDate:2021-03-15 ReportNo.:BCTC2103239878E TestStandards FCCPart15.247 ANSIC63.10-2013 TestResultsPASS Remark:Thisis BluetoothClassic radiotestreport. Testedby:Approvedby: KelseyTan/ProjectHandlerZeroZhou/Reviewer ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 3 of 69 Edition：A.3 TABLEOFCONTENT TestReportDeclarationPage 1.VERSION ........................................................................................................................ 5 2.TESTSUMMARY .......................................................................................................... 6 3.MEASUREMENTUNCERTAINTY ............................................................................. 7 4.PRODUCTINFORMATIONANDTESTSETUP ..................................................... 8 4.1ProductInformation .................................................................................................. 8 4.2TestSetupConfiguration ......................................................................................... 9 4.3SupportEquipment ................................................................................................. 10 4.4ChannelList ............................................................................................................. 10 4.5TestMode ................................................................................................................ 11 4.6tableofparametersoftextsoftwaresetting ....................................................... 11 5.TESTFACILITYANDTESTINSTRUMENTUSED .............................................. 12 5.1TestFacility .............................................................................................................. 12 5.2TestInstrumentUsed ............................................................................................. 12 6.CONDUCTEDEMISSIONS ....................................................................................... 14 6.1BlockDiagramOfTestSetup ............................................................................... 14 6.2Limit ........................................................................................................................... 14 6.3Testprocedure ........................................................................................................ 14 6.4EUToperatingConditions ..................................................................................... 14 6.5TestResult ............................................................................................................... 15 7.RADIATEDEMISSIONS ............................................................................................ 17 7.1BlockDiagramOfTestSetup ............................................................................... 17 7.2Limit ........................................................................................................................... 18 7.3Testprocedure ........................................................................................................ 19 7.4EUToperatingConditions ..................................................................................... 20 7.5TestResult ............................................................................................................... 21 8.RADIATEDBANDEMISSIONMEASUREMENTANDRESTRICTEDBANDS OFOPERATION .............................................................................................................. 25 8.1BlockDiagramOfTestSetup ............................................................................... 25 8.2Limit ........................................................................................................................... 25 8.3Testprocedure ........................................................................................................ 26 8.4EUToperatingConditions ..................................................................................... 26 8.5TestResult ............................................................................................................... 27 9.CONDUCTEDEMISSION .......................................................................................... 28 9.1BlockDiagramOfTestSetup ............................................................................... 28 9.2Limit ........................................................................................................................... 28 9.3Testprocedure ........................................................................................................ 28 9.4TestResult ............................................................................................................... 29 10.20DBBANDWIDTH ......................…

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ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 38 of 69 Edition：A.3 10.20DBBANDWIDTH 10.1BlockDiagramOfTestSetup 10.2Limit N/A 10.3Testprocedure 1.SetRBW=30kHz. 2.Setthevideobandwidth(VBW)≥3xRBW. 3.Detector=Peak. 4.Tracemode=maxhold. 5.Sweep=autocouple. 6.Allowthetracetostabilize. 7.Measurethemaximumwidthoftheemissionthatisconstrainedbythefrequencies associatedwiththetwooutermostamplitudepoints(upperandlowerfrequencies)that areattenuatedby6dBrelativetothemaximumlevelmeasuredinthefundamental emission.. ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 39 of 69 Edition：A.3 10.4TestResult Temperature： 26 °C Relative Humidity： 54% TestVoltage： DC3.7VRemarkN/A ModulationTestChannelBandwidth(MHz) GFSKLow0.933 GFSKMiddle0.936 GFSKHigh0.935 Pi/4DQPSKLow1.253 Pi/4DQPSKMiddle1.252 Pi/4DQPSKHigh1.236 8DPSKLow1.221 8DPSKMiddle1.224 8DPSKHigh1.221 Testplots GFSKLowChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 40 of 69 Edition：A.3 GFSKMiddleChannel GFSKHighChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 41 of 69 Edition：A.3 Pi/4DQPSKLowChannel Pi/4DQPSKMiddleChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 42 of 69 Edition：A.3 Pi/4DQPSKHighChannel 8DPSKLowChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 43 of 69 Edition：A.3 8DPSKMiddleChannel 8DPSKHighChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 44 of 69 Edition：A.3 11.MAXIMUMPEAKOUTPUTPOWER 11.1BlockDiagramOfTestSetup 11.2Limit FCCPart15(15.247),SubpartC SectionTestItemLimit FrequencyRange (MHz) Result 15.247(b)(1) PeakOutput Power 0.125wattor 21dBm 2400-2483.5PASS 11.3Testprocedure 1.RemovetheantennafromtheEUTandthenconnectalowRFcablefromtheantenna porttothespectrum. 2.Setthespectrumanalyzer:RBW=3MHz.VBW=3MHz.Sweep=auto;Detector Function=Peak. 3.KeeptheEUTintransmittingatlowest,mediumandhighestchannelindividually. Recordthemaxvalue. ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 45 of 69 Edition：A.3 11.4TestResult Temperature： 26 °C Relative Humidity： 54% TestVoltage： DC3.7VRemark:N/A ModulationTestChannelOutputPower(dBm)Limit(dBm) GFSKLow1.33321 GFSK Middle1.57821 GFSK High1.25921 Pi/4DQPSK Low0.75221 Pi/4DQPSK Middle1.08521 Pi/4DQPSK High0.73521 8DPSK Low1.39121 8DPSK Middle1.58621 8DPSKHigh1.31221 Testplots GFSKLowChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 46 of 69 Edition：A.3 GFSKMiddleChannel GFSKHighChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 47 of 69 Edition：A.3 Pi/4DQPSKLowChannel Pi/4DQPSKMiddleChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 48 of 69 Edition：A.3 Pi/4DQPSKHighChannel 8DPSKLowChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 49 of 69 Edition：A.3 8DPSKMiddleChannel 8DPSKHighChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 50 of 69 Edition：A.3 12.HOPPINGCHANNELSEPARATION 12.1BlockDiagramOfTestSetup 12.2Limit Frequencyhoppingsystemsshallhavehoppingchannelcarrierfrequenciesseparated byaminimumof25kHzorthe20dBbandwidthofthehoppingchannel,whicheveris greater.Alternatively,frequencyhoppingsystemsoperatinginthe2400-2483.5MHz bandmayhavehoppingchannelcarrierfrequenciesthatareseparatedby25kHzor two-thirdsofthe20dBbandwidthofthehoppingchannel,whicheverisgreater,provided thesystemsoperatewithanoutputpowernogreaterthan0.125W. 12.3Testprocedure 1.RemovetheantennafromtheEUTandthenconnectalowRFcablefromtheantenna port tothespectrum. 2.Setthespectrumanalyzer:RBW=30kHz.VBW=100kHz,Span=2.0MHz.Sweep= auto;DetectorFunction=Peak.Trace=Maxhold. 3.Allowthetracetostabilize.Usethemarker-deltafunctiontodeterminetheseparation betweenthepeaksoftheadjacentchannels.Thelimitisspecifiedinoneofthe subparagraphsofthisSectionSubmitthisplot. ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 51 of 69 Edition：A.3 12.4TestResult ModulationTestChannel Separation (MHz) Limit(MHz)Result GFSKLow1.0140.622PASS GFSKMiddle1.0000.624PASS GFSKHigh1.0000.623PASS Pi/4DQPSKLow1.0020.835PASS Pi/4DQPSKMiddle1.0060.835PASS Pi/4DQPSKHigh1.0180.824PASS 8DPSKLow1.0020.814PASS 8DPSKMiddle1.0000.816PASS 8DPSKHigh0.9980.814PASS Testplots GFSKLowChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 52 of 69 Edition：A.3 GFSKMiddleChannel GFSKHighChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 53 of 69 Edition：A.3 Pi/4DQPSKLowChannel Pi/4DQPSKMiddleChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 54 of 69 Edition：A.3 Pi/4DQPSKHighChannel 8DPSKLowChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 55 of 69 Edition：A.3 8DPSKMiddleChannel 8DPSKHighChannel ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 56 of 69 Edition：A.3 13.NUMBEROFHOPPINGFREQUENCY 13.1BlockDiagramOfTestSetup 13.2Limit Frequencyhoppingsystemsinthe2400-2483.5MHzbandshalluseatleast15 channels. 13.3Testprocedure 1.RemovetheantennafromtheEUTandthenconnectalowRFcablefromtheantenna porttothespectrum. 2.Setthespectrumanalyzer:RBW=100kHz.VBW=300kHz.Sweep=auto;Detector Function=Peak.Trace=Maxhold. 3.Allowthetracetostabilize.Itmayprovenecessarytobreakthespanuptosections.in ordertoclearlyshowallofthehoppingfrequencies.Thelimitisspecifiedinoneofthe subparagraphsofthisSection. 4.Setthespectrumanalyzer:StartFrequency=2.4GHz,StopFrequency=2.4835GHz. Sweep=auto; ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 57 of 69 Edition：A.3 13.4TestResult TestPlots: 79Channelsintotal GFSK Pi/4DQPSK ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 58 of 69 Edition：A.3 8DPSK ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 59 of 69 Edition：A.3 14.DWELLTIME 14.1BlockDiagramOfTestSetup 14.2Limit Frequencyhoppingsystemsinthe2400-2483.5MHzbandshalluseatleast15channels. Theaveragetimeofoccupancyonanychannelshallnotbegreaterthan0.4seconds withinaperiodof0.4secondsmultipliedbythenumberofhoppingchannelsemployed. Frequencyhoppingsystemsmayavoidorsuppresstransmissionsonaparticular hoppingfrequencyprovidedthataminimumof15channelsareused. 14.3Testprocedure 1.RemovetheantennafromtheEUTandthenconnectalowRFcablefromtheantenna porttothespectrum. 2.Setspectrumanalyzerspan=0.Centredonahoppingchannel;…

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ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 66 of 69 Edition：A.3 16.EUTPHOTOGRAPHS EUTPhoto1 EUTPhoto2 ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 67 of 69 Edition：A.3 17.EUTTESTSETUPPHOTOGRAPHS Conductedemissions ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 68 of 69 Edition：A.3 RadiatedMeasurementPhotos ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 69 of 69 Edition：A.3 STATEMENT 1.Theequipmentlistsaretraceabletothenationalreferencestandards. 2.Thetestreportcannotbepartiallycopiedunlesspriorwrittenapprovalisissuedfromour lab. 3.Thetestreportisinvalidwithoutstampoflaboratory. 4.Thetestreportisinvalidwithoutsignatureofperson(s)testingandauthorizing. 5.ThetestprocessandtestresultisonlyrelatedtotheUnitUnderTest. 6.ThequalitysystemofourlaboratoryisinaccordancewithISO/IEC17025. 7.Ifthereisanyobjectiontoreport,theclientshouldinformissuinglaboratorywithin15 daysfromthedateofreceivingtestreport. Address: 1-2/F.,BuildingB,PengzhouIndustrialPark,No.158,Fuyuan1stRoad,Tangwei,Fuhai Subdistrict,Bao'anDistrict,Shenzhen,Guangdong,China TEL：400-788-9558 P.C.:518103 FAX：0755-33229357 Website：http://www.bctc-lab.com E-Mail：[email protected] ※※※※※END※※※※※

ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 67 of 69 Edition：A.3 17.EUTTESTSETUPPHOTOGRAPHS Conductedemissions ReportNo.:BCTC2103239878E No.：BCTC/RF-EMC-007Page: 68 of 69 Edition：A.3 RadiatedMeasurementPhotos