2BFEJ-YFX51Media Player

YFX51MediaPlayerUserManual Dearcustomer ThankyouforpurchasingthePortablespeakerYFX51MediaPlayer.Toensure correctoperation,pleasereadthisusermanualcarefully. ImportantSafetyInstructions ◆Donotusethespeakerinspecialcoldandhotenvironments. ◆Pleaseavoidthespeakerdroppingorhittingwithahardobject,itmaycauseother hardwaredamage. ◆Takecarewhenchargingthespeaker,excessiveprolongedchargingwilldamagethe batterylifetime.Chargethespeakertofullcapacitywhenusingforthefirsttime. ◆Whenbatterylow,theindicatorlightwillflashandvoiceprompt“batterylow”,please chargespeakerintime. ◆Ifdoesnotusethisspeakerforlongtime,pleasechargeatleastoncewithinonemonth, inordertopreventthelithiumbatteryfromcausinganddamagingbecauseofexcessive consumption. ◆Adjustthevolumetoappropriateleveltoavoiddisturbingothers. Features ●Bluetooth5.3stereomusicandmobilehands-freefunction ●USBFlashDiskMusicplaying SupportMP3musicformat,capacityupto32G ●EQadjustment ●Supportlightshowwithdifferentlightingmode TechnicalData BluetoothVersion:5.3 Output:RMS20W BatteryCapacity:12V2000mAh,14.8Wh InputRating:DC12V2A Driver:50mmfullrangedriver*2+passiveradiator*1 Impedance:4Ω NetWeight:1020g SlotandKeys PanelDescription ①Modeconversion⑤Next⑨Reducevolume⑬Microphone ②SoundEffectSelection⑥Prev⑩Audioinput ③ON-OFF⑦Play/Pause⑪Usbinput ④Mute⑧Increasevolume⑫Sdinput ①Modeconversion Shortpress:ChangeMode ②SoundEffectSelection Shortpress:ChangeEQ ③ON-OFF Longpress:Poweron/off ④Mute Shortpress:Muteon/off ⑤Next Shortpress:Nexttrack ⑥Prev Shortpress:Previoustrack ⑦Play/Pause Shortpress:Play/Pause ⑧Increasevolume Shortpress:Volumeup ⑨Reducevolume Shortpress:Volumedown ⑩Audioinput Auxinport ⑪Usbinput Usbinport ⑫Sdinput Sdcardinport ⑬Microphone Phonemicinport Interface 4-pinsocket:loudspeaker2-pinsocket(XH):antenna2-pinsocket(VH):12Vpowersupply OperationInstructions 1.Poweron/off 1)Longpressthe③ON-OFFbuttonfor2stopoweron/offthespeaker.Thedefault workingmodeisBluetoothmodeandthespeakerwillprompt”Bluetoothmode”. 2.Bluetooth 1)Longpress③ON-OFFbuttontopoweronthespeaker,thedefaultworkingmodeis Bluetoothmode. 2)TurnontheBluetoothofyourphone,searchfornearbydevices.The‘G_811’willbe foundonyourmobilepairinglist,pleaseconnectit. 3)Pleaseturnonyourphone’smusicplayerandspeakerwillbeplayedtheselected music. 4)ThespeakerwillpairwiththelatestusedBluetoothdeviceautomatically.Ifthemedia playerisdisconnected,thespeakerwillprompt“Bluetoothpairing”.ThenotherBluetooth devicescanfindandpairwiththespeaker. 3.Mobilehands-freefunction 1)Shortpressthe⑦Play/Pausebuttontopickup/handoffthephonecall. 2)Doublepressthe⑦Play/Pausebuttontorejectthephonecall. 4.USBMusicPlaying InsertingtheUSBFlashDiskintothespeaker,thespeakerwillautomaticallyenterthe USBmodeandprompt“USBmode”. PleaseNote:TheUSBFlashDisksupportingmemoryupto32G,andsupporttheaudio formatatMP3. 5.AuxinMode Usethe3.5mmaudiocableincludedtoconnectthespeakerandanaudiosource(PC, MP3/MP4,mobilephone).Thenthespeakerwillprompt“Auxin”modeandwillbe playedmusicfromtheaudiosource. Troubleshooting 1.WhatshouldIdoifthespeakercannotpairwiththeBluetoothdeviceandplay musicaccordingly? (1)Pleasecheckthespecification/themanualoftheBluetoothdevice(yourmobileor computer),andcheckifthedevicecansupporttheA2DPstereoaudiotransmission.Ifyes, pleaseturnontheA2DPstereomode. (2)EnsurethespeakerisundertheBluetoothpairingstatus,iftherearemanyBluetooth devicesnearby,“G_811”willnoteasytobefound.PleaseturnoffotherBluetooth devices. FCC Warnning: 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 againstharmful interference in a residential installation. This equipment generates, uses and can radiateradio frequency energy and, if not installed and used in accordance with the instructions, maycause harmful interference to radio communications. However, there is no guarantee thatinterference will not occur in a particular installation. If this equipment does cause harmfulinterference to radio or television reception, which can be determined by turning the equipmentoff and on, the user is encouraged to try to correct the interference by one or more of thefollowing 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 technician for help. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. 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. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm Wuxi Yifeixin Electronic Technology Co., Ltd Tel.: 0510-82828635 between the radiator and your body.

-YifeixinElectronicTechnologyCo.,Ltd- FederalCommunicationsCommission AuthorizationandEvaluationDivision EquipmentAuthorizationBranch 7435OaklandMillsRoad Columbia,MD21046 3/15/24 U.S.AgentDesignation NameandcompanyofU.S.agent: 【USAMEIHUATRADINGINC】 PhysicalU.S.addressofagent: 【5379PineValleyCtBoulderCO80301UnitedStates】 FRNofU.S.agent: 【0033406166】 EmailaddressofU.S.agent [Yifeixin Electronic Technology Co., Ltd]acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought (FCC ID:2BFEJ-YFX51) : 【[email protected]】 [USAMEIHUATRADINGINC]acknowledgestheirobligationtoacceptserviceofprocessonbehalfof[Yifeixin ElectronicTechnologyCo.,Ltd]. YifeixinElectronicTechnologyCo.,LtdwiththeFRN[0035110089]acceptsitsobligationtomaintainanagent forserviceofprocessintheUnitedStatesfornolessthanoneyearaftereitherthegranteehaspermanently terminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S.,ortheconclusionofany Commission-relatedadministrativeorjudicialproceedinginvolvingtheequipment,whicheverislater. Bysigningthisform,weconfirmtheaboveandthatweareawareoftheapplicationrequirementslistedunder§ 2.911(d)(7). TheinformationprovidedinthisletterisbasedonthereferencedrulepartsofTitle47oftheCFRaswellasKDB 986446D01. Anexpirationdateforthisletterdoesnotexist.IncasetheU.S.agentchanges,thegranteeisobligatedtonotify theFCCwithin30daysviathegrantingTCB. Sincerely, Signature WeiWang Manager YifeixinElectronicTechnologyCo.,Ltd Signature HarleyQuinn Manager USAMEIHUATRADINGINC 4 8 _ [ m o d e l ] U S _ A g e n t _ 2 . 9 1 1 ( d ) ( 7 ) - U , V 0 5

Page1of4 FCCID:2BFEJ-YFX51 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. ExternalPhotos Photo1 Photo2 Page2of4 FCCID:2BFEJ-YFX51 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo3 Photo4 Page3of4 FCCID:2BFEJ-YFX51 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo5 Photo6 Page4of4 FCCID:2BFEJ-YFX51 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo7 ------End------

FCCLabel FCCID: 2BFEJ-YFX51

FCCID:2BFEJ-YFX51 Page1of5 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. InternalPhotos Photo1 Photo2 FCCID:2BFEJ-YFX51 Page2of5 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo3 Photo4 FCCID:2BFEJ-YFX51 Page3of5 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo5 Photo6 Antenna FCCID:2BFEJ-YFX51 Page4of5 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo7 Photo8 FCCID:2BFEJ-YFX51 Page5of5 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo9 Photo10 ------End------

RFExposureevaluation FCCID:2BFEJ-YFX51 Exposurecategory:Generalpopulation/uncontrolledenvironment EUTType:ProductionUnit DeviceType:MobileDevice 1.Reference Accordingto§1.1307(b)(1),systemsoperatingundertheprovisionsofthissectionshallbe operatedinamannerthatensuresthatthepublicisnotexposedtoradiofrequencyenergy levelinexcessoftheCommission’sguidelines. Accordingto§1.1310and§2.1091RFexposureiscalculated. KDB447498D01:MobileandPortableDevicesRFExposureProceduresandEquipment AuthorizationPolicies 2.Limit LimitsforMaximumPermissibleExposure(MPE)/ControlledExposure Frequency Range(MHz) ElectricField Strength(V/m) MagneticField Strength(A/m) PowerDensity (mW/cm²) AveragingTime (minute) LimitsforOccupational/ControlledExposure 0.3–3.0 3.0–30 30–300 300–1500 1500–100,000 614 1842/f 61.4 / / 1.63 4.89/f 0.163 / / (100)* (900/f 2 )* 1.0 f/300 5 6 6 6 6 6 LimitsforMaximumPermissibleExposure(MPE)/UncontrolledExposure Frequency Range(MHz) ElectricField Strength(V/m) MagneticField Strength(A/m) PowerDensity (mW/cm²) AveragingTime (minute) LimitsforOccupational/ControlledExposure 0.3–3.0 3.0–30 30–300 300–1500 1500–100,000 614 824/f 27.5 / / 1.63 2.19/f 0.073 / / (100)* (180/f 2 )* 0.2 f/1500 1.0 30 30 30 30 30 F=frequencyinMHz *=Plane-waveequivalentpowerdensity 3.MPECalculationMethod PredicationofMPElimitatagivendistance Equationfrompage18ofOETBulletin65,Edition97-01 S=PG/4πR² Where:S=powerdensity P=powerinputtoantenna G=powergainoftheantennainthedirectionofinterestrelativetoanisotropicradiator R=distancetothecenterofradiationoftheantenna 4.AntennaInformation EUTcanonlyuseantennascertificatedasfollowsprovidedbymanufacturer; Antenna ModelNo. ofantenna: Typeofantenna:Gainoftheantenna(Max.)Frequencyrange: BT/PCBantennaAntenna:2.499dBiFor2.4G 5.ManufacturingTolerance BR_EDR(Conducted) Frequency (MHz) BR_EDR_GFSK 240224412480 Target(dBm)-0.011.020.79 Tolerance±(dB)1.01.01.0 Frequency (MHz) BR_EDR_π/4-DQPSK 240224412480 Target(dBm)1.062.142.13 Tolerance±(dB)1.01.01.0 6.StandaloneMPEResult AsdeclaredbytheApplicant,theEUTisawirelessdeviceusedinafixapplication,atleast 20cmfromanybodypartoftheuserornearbypersons;fromthemaximumEUTRFoutput power,theminimumseparationdistance,r=20cm,aswellasthegainoftheusedantennais refertosection4,theRFpowerdensitycanbeobtained. ANT1 ModulationType OutputpowerAntenna Gain (dBi) Antenna Gain (linear) MPE (mW/cm 2 ) MPE Limits (mW/cm 2 ) dBmmW BT3.142.0612.4991.7780.000731.0000 Remark: 1.Outputpower(Peak)includingturn-uptolerance; 2.MPEevaluatedistanceis20cmfromusermanualprovidebymanufacturer. 7.Conclusion ThemeasurementresultscomplywiththeFCCLimitper47CFR2.1091fortheuncontrolled RFExposureofmobiledevice. ----------------THEENDOFREPORT---------------

Page1of37ReportNo.:AIT24030426FW1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. TESTREPORT ClientInformation: Applicant:YifeixinElectronicTechnologyCo.,Ltd Applicantadd.:201-5ChengnanRoad,XinwuDistrict,WuxiCity,JiangsuProvince Manufacturer:YifeixinElectronicTechnologyCo.,Ltd Manufactureradd.:201-5ChengnanRoad,XinwuDistrict,WuxiCity,JiangsuProvince ProductInformation: ProductName:MediaPlayer ModelNo.:YFX51 BrandName:N/A FCCID: 2BFEJ-YFX51 Applicablestandards: FCCCFRTitle47Part15SubpartCSection15.247 PreparedBy: DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang,Huangjiang,Dongguan, Guangdong,China Tel.:+86-769-82020499Fax.:+86-769-82020495 DateofReceipt:Mar.04,2024DateofTest:Mar.04,2024~Mar.12,2024 DateofIssue:Mar.13,2024TestResult:Pass ThisdevicedescribedabovehasbeentestedbyDongguanYaxu(AiT)TechnologyLimitedandthetest resultsshowthattheequipmentundertest(EUT)isincompliancewiththeFCCrequirements.Anditis applicableonlytothetestedsampleidentifiedinthereport. Note:Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofDongguan Yaxu(AiT)TechnologyLimited,thisdocumentmaybealteredorrevisedbyDongguanYaxu(AiT) TechnologyLimited,personalonly,andshallbenotedintherevisionofthedocument.Thistest reportmustnotbeusedbytheclienttoclaimproductendorsement. Reviewedby:Approvedby: EmiyaLinSimbaHuang Page2of37ReportNo.:AIT24030426FW1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. 1Contents Page COVERPAGE 1CONTENTS......................................................................................................................................................................2 2TESTSUMMARY............................................................................................................................................................4 2.1StatementoftheMeasurementUncertainty................................................................................4 2.2MeasurementUncertainty............................................................................................................4 3TESTFACILITY..............................................................................................................................................................5 3.1Deviationfromstandard...............................................................................................................5 3.2Abnormalitiesfromstandardconditions.......................................................................................5 3.3TestLocation.................................................................................................................................5 4GENERALINFORMATION...........................................................................................................................................6 4.1Testfrequencies............................................................................................................................7 4.2EUTPeripheralList.......................................................................................................................8 4.3TestPeripheralList.......................................................................................................................8 4.4TESTMETHODOLOGY...............................................................................................................9 4.5DescriptionofTestModes..........................................................................................................10 5EQUIPMENTUSEDDURINGTEST.........................................................................................................................11 6TESTRESULTSANDMEASUREMENTDATA.....................................................................................................13 6.1Antennarequirement..................................................................................................................13 6.2PeakPowerMeasurement.........................................................................................................14 6.3FrequencySeparationand20dBBandwidth............................................................................16 6.4NumberofHoppingFrequency..................................................................................................18 6.5TimeofOccupancy(DwellTime)...............................................................................................19 6.6ConductedSpuriousEmissionsandBandEdgesTest.............................................................21 6.7Restrict-bandBand-edgeMeasurements..................................................................................23 6.8RadiatedEmissionsMeasurement............................................................................................25 6.9ConductedEmissions.................................................................................................................35 6.10Pseudorandomfrequencyhoppingsequence...........................................................................36 7TESTSETUPPHOTOGRAPHSOFEUT.................................................................................................................37 8EXTERNALPHOTOGRAPHSOFEUT....................................................................................................................37 9INTERNALPHOTOGRAPHSOFEUT.....................................................................................................................37 Page3of37ReportNo.:AIT24030426FW1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. RevisionHistory RevisionIssueDateRevisionsRevisedBy 000 Mar.13,2024 InitialIssueSealChen Page4of37ReportNo.:AIT24030426FW1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. 2TestSummary TestItemSectioninCFR47Result MaximumConduc…

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2.4G-2.48GFrequency band onboard PIFA antenna test report SPECIFICATIONS Frequency（MHz）2400-2480 PeakGain（dBi）2.499 AverageGain（dBi）＞-4 VSWR＜3.2 Impedance（Ω）50Ω AntennaTypePlannarInvertedFAntennaonboard PolarizationLinear Test environment: China Science and technology darkroom test system Z X Y Antenna physical and physical dimensions Length 14mm and width 5mm Antenna passive S-parameters: Standing wave ratio (VSWR), return loss (ReturnLoss) and Smith circle chart Frequency（MHz Antenna efficiency and gain ）Gain（dBi）Effciency（%）AverageGain（dBi）Efficiency（dB） 24001.43359.329%-2.717-2.267 24100.92751.861%-3.416-2.852 24200.82952.112%-3.166-2.831 24300.88149.299%-3.258-3.072 24401.19250.672%-3.144-2.952 24501.68853.067%-2.735-2.752 24602.19459.423%-2.276-2.260 24702.11856.680%-2.438-2.466 24802.49961.727%-2.112-2.095 Average1.52954.908%-2.806-2.616 Peak2.49961.727%-2.112-2.095 2440MHz 2D-Theta Pattern 2440MHz 2D-Phi Pattern 2440MHz 3D-Horizontal Pattern 2440MHz 3D-Vertical Pattern 2440MHz3D-TotalPattern

DongguanYaxu(AiT)TechnologyLimited ReportNo.:AIT24030426FW1 FCCID:2BFEJ-YFX51 Page1of42 AppendixA RFTestDataforBT(BDR/EDR)(ConductedMeasurement) ProductName:MediaPlayer TradeMark:N/A TestModel:YFX51 EnvironmentalConditions Temperature:25.8°C RelativeHumidity:52.4% ATMPressure:101Kpa TestEngineer:SimbaHuang Supervisedby:SealChen DongguanYaxu(AiT)TechnologyLimited ReportNo.:AIT24030426FW1 FCCID:2BFEJ-YFX51 Page2of42 Contents Page COVERPAGE 1DutyCycle........................................................................................................................................................................................3 1.1TestResult............................................................................................................................................................................3 1.2TestGraphs...........................................................................................................................................................................4 2MaximumConductedPeakOutputPower........................................................................................................................................7 2.1TestResult............................................................................................................................................................................7 2.2TestGraphs...........................................................................................................................................................................8 320dBBandwidth..............................................................................................................................................................................11 3.1TestResult..........................................................................................................................................................................11 3.2TestGraphs.........................................................................................................................................................................12 4CarrierFrequencySeparation.........................................................................................................................................................15 4.1TestResult..........................................................................................................................................................................15 4.2TestGraphs.........................................................................................................................................................................16 5HoppingChannelNumber...............................................................................................................................................................17 5.1TestResult..........................................................................................................................................................................17 5.2TestGraphs.........................................................................................................................................................................18 6DwellTime......................................................................................................................................................................................19 6.1TestResult..........................................................................................................................................................................19 6.2TestGraphs.........................................................................................................................................................................20 7RFConductedSpuriousEmissions.................................................................................................................................................22 7.1TestResult..........................................................................................................................................................................22 7.2TestGraphs.........................................................................................................................................................................23 8Band-edgeforRFConductedEmissions........................................................................................................................................29 8.1TestResult..........................................................................................................................................................................29 8.2TestGraphs.........................................................................................................................................................................30 9Restrict-bandband-edgemeasurements........................................................................................................................................38 9.1TestResult..........................................................................................................................................................................38 9.2TestGraphs.........................................................................................................................................................................39 DongguanYaxu(AiT)TechnologyLimited ReportNo.:AIT24030426FW1 FCCID:2BFEJ-YFX51 Page3of42 1DutyCycle 1.1TestResult ModeFrequency(MHz)DutyCycle(%)1/T(kHz)Factor(dB) 1-DH1240231.22.635.06 1-DH1244131.212.635.06 1-DH1248031.432.635.03 2-DH12402322.564.95 2-DH1244132.042.564.94 2-DH12480322.564.95 DongguanYaxu(AiT)TechnologyLimited ReportNo.:AIT24030426FW1 FCCID:2BFEJ-YFX51 Page4of42 1.2TestGraphs TestGraphs 1-DH12402MHz 1-DH12441MHz DongguanYaxu(AiT)TechnologyLimited ReportNo.:AIT24030426FW1 FCCID:2BFEJ-YFX51 Page5of42 1-DH12480MHz 2-DH12402MHz DongguanYaxu(AiT)TechnologyL…

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Page1of1 FCCID:2BFEJ-YFX51 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. TestSetupPhoto RadiatedEmission ------End------