2AIT8-WF4122Bluetooth active stereo

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 r esponsible 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 p rovide 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 occ ur i n a particular installation. If this equipment does cause harmful interference to ra dio or television reception, which can be determined by tur ning 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. -C onnect the equipment into an outlet on a circuit different from that to which the receiver is connected. -C onsult the dealer or an ex perienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement.

GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD Date:2021-3-16 To:FederalCommunicationsCommission FCCID:2AIT8-WF4122 ToWhomItMayConcern: ThisletteristoascertainthatGUANGZHOUHEADWAYI.&E.TRADINGCO., LTD MODELNo.:WF-4122 WF-4120,WF-4121,WF-4123,WF-4125,WF-4126,WF-4128,WF-4150,WF-4151, WF-4152,WF-4153,WF-4155,WF-4156,WF-9120,WF-9121,WF-9122,WF-9123, WF-9125,WF-9126,WF-9127,WF-9128,WF-9212,WF-9215,WF-9218,WF-9225, WF-9226,WF-9228,WF-9268,WF-9151,WF-9152,WF-9155,WF-9156,WF-9158, WF-9510,WF-9512,WF-9515,WF-91820,WF-91821,WF-91822,PS-91026,PS- 91028,PS-4121,PS-4221,PS-4223,PS-4225,LOUD4153,LOUD4155, LOUD4156 HasbeentheunitsusedforconductingFCCcompliancetesting,theSDoCpartwill betestedbyShenzhenBCTCTestingCo.,Ltd. Ifyouhaveanyquestionorconcerns,pls.contactus. Sincerely, Client’ssignature： Client’sname/title：DeliuTan(Manager) Contactinformation/address:GUANGZHOUHEADWAYI.&E.TRADINGCO., LTD

Rev11/20/07 (GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD) FederalCommunicationsCommission AuthorizationandEvaluationDivision ConfidentialityRequestregardingapplicationforcertificationofFCCID: 2AIT8-WF4122 PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestconfidential treatmentofinformationaccompanyingthisapplicationasoutlinedbelow: ExhibitTypeFileName BlockDiagram, Schematics, OperationalDescription BlockDiagram Schematics OperationalDescription Theabovematerialscontaintradesecretsandproprietaryinformationnotcustomarilyreleasedto thepublic.Thepublicdisclosureofthesematerialsmaybeharmfultotheapplicantandprovide unjustifiedbenefitstoitscompetitors. TheapplicantunderstandsthatpursuanttoSection0.457oftheRules,disclosureofthis applicationandallaccompanyingdocumentationwillnotbemadebeforethedateoftheGrant forthisapplication. Sincerely, (DeliuTan)

GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD ModelDifference Productdescription:Bluetoothactivestereo Modelname:WF-4122 WF-4120,WF-4121,WF-4123,WF-4125,WF-4126,WF-4128,WF-4150,WF-4151,WF- 4152,WF-4153,WF-4155,WF-4156,WF-9120,WF-9121,WF-9122,WF-9123,WF- 9125,WF-9126,WF-9127,WF-9128,WF-9212,WF-9215,WF-9218,WF-9225,WF- 9226,WF-9228,WF-9268,WF-9151,WF-9152,WF-9155,WF-9156,WF-9158,WF- 9510,WF-9512,WF-9515,WF-91820,WF-91821,WF-91822,PS-91026,PS-91028,PS- 4121,PS-4221,PS-4223,PS-4225,LOUD4153,LOUD4155,LOUD4156 TradeName:N/A FCCID:2AIT8-WF4122 AllthemodelarethesamecircuitandRFmodule,exceptmodelnames. Regards Sincerely Client’ssignature: Client’sname/title:DeliuTan/N/A Contactinformation/address:5F,NO.89JIANSHEROAD(N.)HUADU,GUANGZHOU China

(GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD) FederalCommunicationsCommission AuthorizationandEvaluationDivision 1435OaklandMillsRoad Columbia,MD21046 Date:2021.3.11 SUBJECT:FCCApplicationforFCCID:2AIT8-WF4122 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, (DeliuTan)

ExternalPhotos FMreceive Antenna

Label&labellocation Size:40*20mm Bluetoothactivestereo FCCID:2AIT8-WF4122 Thisdevicecomplieswithpart15oftheFCCRules.Operation issubjecttothefollowingtwoconditions: (1)Thisdevicemaynotcauseharmfulinterference,and (2)Thisdevicemustacceptanyinterferencereceived,including interferencethatmaycauseundesiredoperation.

InternalPhotos WIFIAntenna BTAntenna

RFEXPOSUREEVALUATIONMETHOD FCCID:2AIT8-WF4122 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-EDR maxpossibleoutputpower(PK,conducted)：-3±1dbm 0dBilogarithmictermsconverttonumericresultisnearly1 -2dBm=0.63mW 2402MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=0.63/5*√2.402=0.20≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. Modulation Frequency (MHz) OutputPower (dBm) MaxAntenna Gain(dBi) GFSK 2402-5.9970 GFSK 2441-5.5420 GFSK 2480-5.1870 Pi/4DQPSK 2402-4.8140 Pi/4DQPSK 2441-4.3820 Pi/4DQPSK 2480-3.9900 2441MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=0.63/5*√2.441=0.20≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2480MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=0.63/5*√2.48=0.20≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. WIFI Frequency MaximumConductedOutput Power(PK) LIMIT (MHz)(dBm)dBm 802.11b 2412 8.61630 2437 8.25930 2462 8.52530 802.11g 2412 7.19330 2437 7.27030 2462 7.59830 802.11n20 2412 6.33030 2437 6.48030 2462 6.64030 802.11n40 2422 5.59730 2437 5.54130 2452 5.73330 maxpossibleoutputpower(PK,conducted)：8±1dbm 1dBilogarithmictermsconverttonumericresultisnearly1.259 9dbm=7.94mW 2412MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=7.94/5*√2.412=2.47≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2437MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=7.94/5*√2.437=2.48≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2462MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=7.94/5*√2.462=2.49≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. Conclusion:NoSARisrequired. SARTestExclusion Threshold(mW) TotalSARTest ExclusionThreshold (mW) Limit (mW) Result BT0.20 2.693Pass 2.4GHz WIFI 2.49

No.：BCTC/RF-EMC-005Page 1 of 61 Edition：A.3 TESTREPORT ShenzhenBCTCTestingCo.,Ltd. ReportNo.: BCTC2101805387-1E Applicant: GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD ProductName: Bluetoothactivestereo Model/Type reference: WF-4122 TestedDate: 2021-01-05to2021-03-09 IssuedDate: 2021-03-09 ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 2 of 61 Edition：A.3 FCCID:2AIT8-WF4122 Thetestreportiseffectiveonlywithbothsignatureandspecializedstamp.Thisresult(s)showninthis reportreferonlytothesample(s)tested.WithoutwrittenapprovalofShenzhenBCTCTestingCo.,Ltd, thisreportcan’tbereproducedexceptinfull.Thetestedsample(s)andthesampleinformationare providedbytheclient. ProductName: Bluetoothactivestereo Trademark: N/A Model/Typereference: WF-4122 WF-4120,WF-4121,WF-4123,WF-4125,WF-4126,WF-4128,WF-4150, WF-4151,WF-4152,WF-4153,WF-4155,WF-4156,WF-9120,WF-9121, WF-9122,WF-9123,WF-9125,WF-9126,WF-9127,WF-9128,WF-9212, WF-9215,WF-9218,WF-9225,WF-9226,WF-9228,WF-9268,WF-9151, WF-9152,WF-9155,WF-9156,WF-9158,WF-9510,WF-9512,WF-9515, WF-91820,WF-91821,WF-91822,PS-91026,PS-91028,PS-4121, PS-4221,PS-4223,PS-4225,LOUD4153,LOUD4155,LOUD4156 PreparedFor: GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD Address: 5F,NO.89JIANSHEROAD(N.)HUADU,GUANGZHOUChina Manufacturer: GUANGZHOULEISHENGAUDIOELECTRONEQUIPMENTSCO.,LTD Address: NO.3.DongjingRoad,DonghuaIndustrialZone,RenheTown, BaiyunDistrict,Guangzhou,China PreparedBy: ShenzhenBCTCTestingCo.,Ltd. Address: 1-2/F.,BuildingB,PengzhouIndustrialPark,No.158,Fuyuan1stRoad, Tangwei,FuhaiSubdistrict,Bao'anDistrict,Shenzhen,Guangdong, China SampleReceivedDate: 2021-01-05 SampletestedDate: 2021-01-05to2021-03-09 IssueDate: 2021-03-09 ReportNo.: BCTC2101805387-1E TestStandards FCCPart15.247 ANSIC63.10-2013 TestResults PASS Remark:ThisisBluetoothClassicradiotestreport. Testedby:Approvedby: KelseyTan/ProjectHandlerZeroZhou/Reviewer ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 3 of 61 Edition：A.3 TABLEOFCONTENT TestReportDeclarationPage 1.VERSION ........................................................................................................................ 5 2.TESTSUMMARY .......................................................................................................... 6 3.MEASUREMENTUNCERTAINTY ............................................................................. 7 4.PRODUCTINFORMATIONANDTESTSETUP ..................................................... 8 4.1ProductInformation .................................................................................................. 8 4.2TestSetupConfiguration ......................................................................................... 8 4.3SupportEquipment ................................................................................................... 9 4.4ChannelList ............................................................................................................... 9 4.5TestMode ................................................................................................................ 10 5.TESTFACILITYANDTESTINSTRUMENTUSED .............................................. 11 5.1TestFacility .............................................................................................................. 11 5.2TestInstrumentUsed ............................................................................................. 11 6.CONDUCTEDEMISSIONS ....................................................................................... 13 6.1BlockDiagramOfTestSetup ............................................................................... 13 6.2Limit ........................................................................................................................... 13 6.3Testprocedure ........................................................................................................ 13 6.4EUToperatingConditions ..................................................................................... 14 6.5TestResult ............................................................................................................... 15 7.RADIATEDEMISSIONS ............................................................................................ 17 7.1BlockDiagramOfTestSetup ............................................................................... 17 7.2Limit ........................................................................................................................... 18 7.3Testprocedure ........................................................................................................ 18 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 ...…

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ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 41 of 61 Edition：A.3 11.4TestResult Temperature： 26 °C Relative Humidity： 54% TestVoltage： AC120V/60HzRemark:N/A ModulationTestChannelOutputPower(dBm)Limit(dBm) GFSKLow-5.99721 GFSK Middle-5.54221 GFSK High-5.18721 Pi/4DQPSK Low-4.81421 Pi/4DQPSK Middle-4.38221 Pi/4DQPSK High-3.99021 ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 42 of 61 Edition：A.3 Testplots GFSKLowChannel GFSKMiddleChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 43 of 61 Edition：A.3 GFSKHighChannel Pi/4DQPSKLowChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 44 of 61 Edition：A.3 Pi/4DQPSKMiddleChannel Pi/4DQPSKHighChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 45 of 61 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.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 46 of 61 Edition：A.3 12.4TestResult ModulationTestChannel Separation (MHz) Limit(MHz)Result GFSKLow1.0020.588PASS GFSKMiddle0.9980.581PASS GFSKHigh1.0060.588PASS Pi/4DQPSKLow1.0000.841PASS Pi/4DQPSKMiddle1.0000.844PASS Pi/4DQPSKHigh0.9960.835PASS ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 47 of 61 Edition：A.3 Testplots GFSKLowChannel GFSKMiddleChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 48 of 61 Edition：A.3 GFSKHighChannel Pi/4DQPSKLowChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 49 of 61 Edition：A.3 Pi/4DQPSKMiddleChannel Pi/4DQPSKHighChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 50 of 61 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.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 51 of 61 Edition：A.3 13.4TestResult TestPlots: 79Channelsintotal GFSK Pi/4DQPSK ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 52 of 61 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; 3.SetRBW=1MHzandVBW=3MHz.Sweep=asnecessarytocapturetheentiredwell timeperhoppingchannel.SettheEUTforDH5,DH3andDH1packettransmitting. 4.Usethemarker-deltafunctiontodeterminethedwelltime.Ifthisvaluevarieswith differentmodesofoperation(e.g..datarate.modulationformat.etc.).repeatthistestfor eachvariation.ThelimitisspecifiedinoneofthesubparagraphsofthisSection.Submit thisplot(s). ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 53 of 61 Edition：A.3 14.4TestResult DH5Packetpermitmaximum1600/79/6hopspersecondineachchannel (5timeslotsRX,1timeslotTX). DH3Packetpermitmaximum1600/79/4hopspersecondineachchannel (3timeslotsRX,1timeslotTX). DH1Packetpermitmaximum1600/79/2hopspersecondineachchannel (1timeslotRX,1timeslotTX).So,theDwellTimecanbecalculatedasfollows: DH5:1600/79/6*0.4*79*(MkrDelta)/1000 DH3:1600/79/4*0.4*79*(MkrDelta)/1000 DH1:1600/79/2*0.4*79*(MkrDelta)/1000 Remark:MkrDeltaisoncepulsetime. Modulation Channel Data Packet pulse time(ms) Dwell Time(s) Limits(s) GFSKMiddle DH10.3880.1240.4 DH3 1.650 0.2640.4 DH5 2.910 0.3100.4 Pi/4DQPSKMiddle 2DH10.3960.1270.4 2DH31.6560.2650.4 2DH52.9200.3110.4 ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 54 of 61 Edition：A.3 TestPlots GFSKDH1MiddleChannel GFSKDH3MiddleChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 55 of 61 Edition：A.3 GFSKDH5HighMiddleChannel Pi/4DQPSKDH1MiddleChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 56 of 61 Edition：A.3 Pi/4DQPSKDH3MiddleChannel Pi/4DQPSKDH5MiddleChannel ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 57 of 61 Edition：A.3 15.ANTENNAREQUIREMENT 15.1Limit 15.203requirement:Forintentionaldevice,accordingto15.203:anintentionalradiator shall bedesignedtoensurethatnoantennaotherthanthatfurnishedbytheresponsibleparty shallbeusedwiththedevice. 15.2TestResult TheEUTantennaisPCBantenna,fulfilltherequirementofthissection. ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 58 of 61 Edition：A.3 16.EUTPHOTOGRAPHS EUTPhoto1 EUTPhoto2 ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 59 of 61 Edition：A.3 17.EUTTESTSETUPPHOTOGRAPHS Conductedemissions RadiatedMeasurementPhotos ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 60 of 61 Edition：A.3 ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 61 of 61 Edition：A.3 STATEMENT 1.Theequipmentlistsaretracea…

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ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 59 of 61 Edition：A.3 17.EUTTESTSETUPPHOTOGRAPHS Conductedemissions RadiatedMeasurementPhotos ReportNo.:BCTC2101805387-1E No.：BCTC/RF-EMC-005Page 60 of 61 Edition：A.3