2AIT8-WF4128Bluetooth speaker

FCC WARNING This device complies with part 15 of the FCC Rules. Operation is subject to the follow ing two conditions : (1) this device may not cause harmful interference, and (2) this device must accept any interference received, inc luding 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 residentia l 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 televis ion 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 technic ian for help. To maintain compliance with FCC’s RF Exposure guidelines, This equipment should be insta lled and operated with minimum distance between 20cm the radiator your body: Use only the supplied antenna.

GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD Date:2021-3-16 To:FederalCommunicationsCommission FCCID:2AIT8-WF4128 ToWhomItMayConcern: ThisletteristoascertainthatGUANGZHOUHEADWAYI.&E.TRADINGCO., LTD MODELNo.:WF-4128 WF-41218,WF-41228,WF-41238,WF-41268,WF-41288,WF-41212,WF-4152, WF-41522,WF41533,WF-41538,WF-41566,WF-41568,WF-41588,WF-41232, WF-41252,WF-41262,WF-41272,WF-41282,WF-41292,WF-18211,WF-18212, WF-18213,WF-18214,WF-18215,WF-18216,WF-18217,WF-18219,WF-4181, WF-4182,WF-4183,WF-4183,WF-4184,WF-4185,WFS-4186,WF-4187,WF- 4188,WF-4189,PS-4212,PS-4213,PS-4215,PS-4216,PS-4217,PS-4218,PS- 4219,PS-92181,PS-92182,PS-92186,PS-92187,PS-92188 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-WF4128 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:Bluetoothspeaker Modelname:WF-4128 WF-41218,WF-41228,WF-41238,WF-41268,WF-41288,WF-41212,WF-4152,WF- 41522,WF41533,WF-41538,WF-41566,WF-41568,WF-41588,WF-41232,WF-41252, WF-41262,WF-41272,WF-41282,WF-41292,WF-18211,WF-18212,WF-18213,WF- 18214,WF-18215,WF-18216,WF-18217,WF-18219,WF-4181,WF-4182,WF-4183, WF-4183,WF-4184,WF-4185,WFS-4186,WF-4187,WF-4188,WF-4189,PS-4212,PS- 4213,PS-4215,PS-4216,PS-4217,PS-4218,PS-4219,PS-92181,PS-92182,PS-92186, PS-92187,PS-92188 TradeName:N/A FCCID:2AIT8-WF4128 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-WF4128 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 Bluetoothspeaker FCCID:2AIT8-WF4128 Thisdevicecomplieswithpart15oftheFCCRules.Operation issubjecttothefollowingtwoconditions: (1)Thisdevicemaynotcauseharmfulinterference,and (2)Thisdevicemustacceptanyinterferencereceived,including interferencethatmaycauseundesiredoperation.

InternalPhotos

BTAntenna

WIFI Antenna

RFEXPOSUREEVALUATIONMETHOD FCCID:2AIT8-WF4128 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)：-4±1dbm 0dBilogarithmictermsconverttonumericresultisnearly1 -3dBm=0.50mW 2402MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=0.50/5*√2.402=0.16≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. Modulation Frequency (MHz) OutputPower (dBm) MaxAntenna Gain(dBi) GFSK 2402-5.9990 GFSK 2441-5.5680 GFSK 2480-5.2020 Pi/4DQPSK 2402-4.8370 Pi/4DQPSK 2441-4.4370 Pi/4DQPSK 2480-4.0120 2441MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=0.50/5*√2.441=0.16≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2480MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=0.50/5*√2.48=0.16≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. WIFI Frequency MaximumConductedOutput Power(PK) LIMIT (MHz)(dBm)dBm 802.11b 2412 8.52330 2437 8.42330 2462 8.77830 802.11g 2412 7.34030 2437 7.35230 2462 7.64930 802.11n20 2412 6.51530 2437 6.49430 2462 6.77030 802.11n40 2422 5.79130 2437 5.64230 2452 5.70330 maxpossibleoutputpower(PK,conducted)：8.5±1dbm 1dBilogarithmictermsconverttonumericresultisnearly1.259 9.5dbm=8.91mW 2412MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=8.91/5*√2.412=2.77≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2437MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=8.91/5*√2.437=2.78≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. 2462MHz [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]·[√f(GHz)]=8.91/5*√2.462=2.80≤3.0 ThresholdatwhichnoSARrequiredis10mwand≤3.0for1-gSAR,Separation distanceis5mm. Conclusion:NoSARisrequired.

No.：BCTC/RF-EMC-005Page 1 of 62 Edition：A.3 TESTREPORT ShenzhenBCTCTestingCo.,Ltd. ReportNo.: BCTC2101722047-1E Applicant: GUANGZHOUHEADWAYI.&E.TRADINGCO., LTD ProductName:Bluetoothspeaker Model/TypeRef.:WF-4128 TestedDate:2021-01-05to2021-02-22 IssuedDate:2021-02-22 ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 2 of 62 Edition：A.3 FCCID:2AIT8-WF4128 Thetestreportiseffectiveonlywithbothsignatureandspecializedstamp.Thisresult(s)showninthisreport referonlytothesample(s)tested.WithoutwrittenapprovalofShenzhenBCTCTestingCo.,Ltd,thisreport can’tbereproducedexceptinfull.Thetestedsample(s)andthesampleinformationareprovidedbythe client. ProductName: Bluetoothspeaker Trademark: N/A Model/TypeRef.: WF-4128 WF-41218,WF-41228,WF-41238,WF-41268,WF-41288,WF-41212, WF-4152,WF-41522,WF41533,WF-41538,WF-41566,WF-41568, WF-41588,WF-41232,WF-41252,WF-41262,WF-41272,WF-41282, WF-41292,WF-18211,WF-18212,WF-18213,WF-18214,WF-18215, WF-18216,WF-18217,WF-18219,WF-4181,WF-4182,WF-4183, WF-4183,WF-4184,WF-4185,WFS-4186,WF-4187,WF-4188, WF-4189,PS-4212,PS-4213,PS-4215,PS-4216,PS-4217,PS-4218, PS-4219,PS-92181,PS-92182,PS-92186,PS-92187,PS-92188 PreparedFor: GUANGZHOUHEADWAYI.&E.TRADINGCO.,LTD Address: 5F,NO.89JIANSHEROAD(N.)HUADU,GUANGZHOU,China Manufacturer: GUANGZHOULEISHENGAUDIOELECTRONEQUIPMENTSCO.,LTD Address: NO.3.DongjingRoad,DonghuaIndustrialZone,RenheTown,Baiyun District,Guangzhou PreparedBy: ShenzhenBCTCTestingCo.,Ltd. Address: 1-2/F.,BuildingB,PengzhouIndustrialPark,No.158,Fuyuan1stRoad, Tangwei,FuhaiSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China SampleReceivedDate: 2021-01-05 SampletestedDate: 2021-01-05to2021-02-22 IssueDate: 2021-02-22 ReportNo.: BCTC2101722047-1E TestStandards FCCPart15.247 ANSIC63.10-2013 TestResults PASS Remark:ThisisBluetoothClassicradiotestreport. Testedby:Approvedby: KelseyTan/ProjectHandlerZeroZhou/Reviewer ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 3 of 62 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 4.6tableofparametersoftextsoftwaresetting ....................................................... 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 ........................................................................................................ 19 7.4EUToperatingConditions ..................................................................................... 21 7.5TestResult ............................................................................................................... 22 8.RADIATEDBANDEMISSIONMEASUREMENTANDRESTRICTEDBANDS OFOPERATION .............................................................................................................. 26 8.1BlockDiagramOfTestSetup ............................................................................... 26 8.2Limit ........................................................................................................................... 26 8.3Testprocedure ........................................................................................................ 27 8.4EUToperatingConditions ..................................................................................... 27 8.5TestResult ............................................................................................................... 28 9.CONDUCTEDEMISSION .......................................................................................... 29 9.1BlockDiagramOfTestSetup ............................................................................... 29 9.2Limit ....................................…

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ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 41 of 62 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.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 42 of 62 Edition：A.3 11.4TestResult Temperature： 26 °C Relative Humidity： 54% TestVoltage： AC120V/60HzRemark:N/A ModulationTestChannelOutputPower(dBm)Limit(dBm) GFSKLow-5.99921 GFSK Middle-5.56821 GFSK High-5.20221 Pi/4DQPSK Low-4.83721 Pi/4DQPSK Middle-4.43721 Pi/4DQPSK High-4.01221 Testplots GFSKLowChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 43 of 62 Edition：A.3 GFSKMiddleChannel GFSKHighChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 44 of 62 Edition：A.3 Pi/4DQPSKLowChannel Pi/4DQPSKMiddleChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 45 of 62 Edition：A.3 Pi/4DQPSKHighChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 46 of 62 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.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 47 of 62 Edition：A.3 12.4TestResult ModulationTestChannel Separation (MHz) Limit(MHz)Result GFSKLow1.0060.589PASS GFSKMiddle0.9960.586PASS GFSKHigh1.0000.577PASS Pi/4DQPSKLow1.0060.841PASS Pi/4DQPSKMiddle1.0040.839PASS Pi/4DQPSKHigh1.0040.832PASS Testplots GFSKLowChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 48 of 62 Edition：A.3 GFSKMiddleChannel GFSKHighChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 49 of 62 Edition：A.3 Pi/4DQPSKLowChannel Pi/4DQPSKMiddleChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 50 of 62 Edition：A.3 Pi/4DQPSKHighChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 51 of 62 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.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 52 of 62 Edition：A.3 13.4TestResult TestPlots: 79Channelsintotal GFSK Pi/4DQPSK ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 53 of 62 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.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 54 of 62 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 DH10.3900.1250.4 DH3 1.656 0.2650.4 DH5 2.895 0.3090.4 Pi/4DQPSKMiddle 2DH10.3960.1270.4 2DH31.7040.2730.4 2DH52.9100.3100.4 TestPlots GFSKDH1MiddleChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 55 of 62 Edition：A.3 GFSKDH3MiddleChannel GFSKDH5HighMiddleChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 56 of 62 Edition：A.3 Pi/4DQPSKDH1MiddleChannel Pi/4DQPSKDH3MiddleChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 57 of 62 Edition：A.3 Pi/4DQPSKDH5MiddleChannel ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 58 of 62 Edition：A.3 15.ANTENNAREQUIREMENT 15.1Limit 15.203requirement:Forintentionaldevice,accordingto15.203:anintentionalradiator shall bedesignedtoensurethatnoantennaotherthanthatfurnishedbytheresponsib…

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ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 60 of 62 Edition：A.3 17.EUTTESTSETUPPHOTOGRAPHS Conductedemissions RadiatedMeasurementPhotos ReportNo.:BCTC2101722047-1E No.：BCTC/RF-EMC-005Page 61 of 62 Edition：A.3