2AXE4-GK75SUSB+Bluetooth+2.4G 3 mode Keyboard

DongguanJizhiElectronicTechnologyCo.,Ltd. OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:2022-01-05 Subject;RequestforConfidentiality FCCID:2AXE4-GK75S ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthesedocuments mightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantageinthemarket. SchematicDiagram BlockDiagram PartsList OperationalDescription Tune-upProcedure 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:NaturalZhou Title:ChiefEngineer

DongguanJizhiElectronicTechnologyCo.,Ltd. AgentAuthorization Company:DongguanJizhiElectronicTechnologyCo.,Ltd. Address:Room101,Building3,No.1Room201,Building1,No.1,BaoyuanRoad, Lianhu,Tangxiatown,Dongguan,China. ProductName:USB+Bluetooth+2.4G3modeKeyboard ModelNumber(s):GK75S,GK75XS,AK75S,SK75S,JK-223 ProductDescription:Frequencyin2402-2480MHz,BTmodeoperation. WeauthorizeMiCOMLabsInc.,575BoulderCourt,Pleasanton,California94566,USA, toactonourbehalfonallmattersconcerningthecertificationofabovenamed equipment. WedeclarethatMiCOMLabsInc.isallowedtoforwardallinformationrelatedtothe approvalandcertificationofequipmenttotheregulatoryagenciesasrequiredandto discussanyissuesconcerningtheapprovalapplication.Anyandallactscarriedoutby MiCOMLabsonourbehalfshallhavethesameeffectasactsofourown. Signature:Date:2023-1-5 Name:NaturalZhou Title:ChiefEngineer Company:DongguanJizhiElectronicTechnologyCo.,Ltd.

DongguanJizhiElectronicTechnologyCo.,Ltd. Add:Room101,Building3,No.1Room201,Building1,No.1,BaoyuanRoad,Lianhu, Tangxiatown,Dongguan,China. Date:2023.01.05 FCCID:2AXE4-GK75S DearSir/Madam, We,DongguanJizhiElectronicTechnologyCo.,Ltd..Herebydeclaresthefollowingstatement forFederalCommunicationsCommission,AllmodelsidenticaltoPCBLayout,schematicsand construction,Thedifferencesonlyarethemodelnames.: Productname:USB+Bluetooth+2.4G3modeKeyboard Modelno.:GK75S,GK75XS,AK75S,SK75S,JK-223 Sincerely, Name/Title： NaturalZhou/ChiefEngineer Company: DongguanJizhiElectronicTechnologyCo.,Ltd. Address: Room101,Building3,No.1Room201,Building1,No.1, BaoyuanRoad,Lianhu,Tangxiatown,Dongguan,China. Phone: 0086-769-81000597 Fax: 0086-769-81000597 E-Mail: [email protected]

FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S

FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S FCCID:2AXE4-GK75S Ant FCCID:2AXE4-GK75S

FCCID:2AXE4-GK75S RFExposureEvaluation 1.1.ApplicableStandard Accordingto§1.1307(b)(1),systemsoperatingundertheprovisionsofthissectionshallbe operatedinamannerthatensuresthatthepublicisnotexposedtoradiofrequencyenergy levelinexcessoftheCommission’sguidelines. Accordingto§1.1310and§2.1093RFexposureiscalculated. KDB447498v06:MobileandPortableDevicesRFExposureProceduresandEquipment AuthorizationPolicies. 1.2.Requirement AccordingtoKDB447498D01GeneralRFExposureGuidancev06Section4.3.1 StandaloneSARtestexclusionconsiderations:“Unlessspecificallyrequiredbythe publishedRFexposureKDBprocedures,standalone1-gheadorbodyand10-gextremity SARevaluationforgeneralpopulationexposureconditions,bymeasurementornumerical simulation,isnotrequiredwhenthecorrespondingSARTestExclusionThreshold condition,listedbelow,issatisfied.Thesetestexclusionconditionsarebasedon source-basedtime-averagedmaximumconductedoutputpoweroftheRFchannel requiringevaluation,adjustedfortune-uptolerance,andtheminimumtestseparation distancerequiredfortheexposureconditions.22Theminimumtestseparationdistanceis determinedbythesmallestdistancefromtheantennaandradiatingstructuresorouter surfaceofthedevice,accordingtothehostformfactor,exposureconditionsandplatform requirements,toanypartofthebodyorextremityofauserorbystander(see5)ofsection 4.1).ToqualifyforSARtestexclusion,thetestseparationdistancesappliedmustbefully explainedandjustifiedbytheoperatingconfigurationsandexposureconditionsofthe transmitterandapplicablehostplatformrequirements,typicallyintheSARmeasurementor SARanalysisreport,accordingtotherequiredpublishedRFexposureKDBprocedures. WhennootherRFexposuretestingorreportingisrequired,astatementofjustificationand compliancemustbeincludedintheequipmentapproval,inlieuoftheSARreport,toqualify fortheSARtestexclusion.Whenrequired,thedevicespecificconditionsdescribedinthe otherpublishedRFexposureKDBproceduresmustbesatisfiedbeforeapplyingtheseSAR testexclusionprovisions;forexample,handheldPTTtwo-wayradios,handsets,laptops& tabletsetc.23“[(max.powerofchannel,includingtune-uptolerance,mW)/(min.test separationdistance,mm)]·[√f(GHz)]≤3.0for1-gSARand≤7.5for10-gextremitySAR, where: •f(GHz)istheRFchanneltransmitfrequencyinGHz •PoweranddistanceareroundedtothenearestmWandmmbeforecalculation •Theresultisroundedtoonedecimalplaceforcomparison •3.0and7.5arereferredtoasthenumericthresholdsinthestep2belowThetest exclusionsareapplicableonlywhentheminimumtestseparationdistanceis≤50mmand fortransmissionfrequenciesbetween100MHzand6GHz.Whentheminimumtest separationdistanceis<5mm,adistanceof5mmaccordingto5)insection4.1isapplied todetermineSARtestexclusion. 1.3.Manufacturingtolerance 1.4.EvaluationResult 0.nd/ Mode f (GHz) Antenna Distance (mm) RFoutputpower (including tune-up tolerance) SARTest Exclusion Threshold SARTest Exclusion dBmmW BT(BLE)2.402511.2590.39<3.0Yes 2.4G2.402511.2590.39<3.0Yes Note:Result=P F /D P=Maximumturn-uppowerinmW F=ChannelfrequencyinGHz D=Mininmuntestseparationdistanceinmm 1.5.Conclusion ThemeasurementresultscomplywiththeFCCLimitper47CFR2.1093forthe uncontrolledRFExposureandSARExclusionThresholdperKDB447498v06,NoSARis required. BLE GFSK ChannelChannel00Channel19Channel39 Target(dBm)0.0-1.00.0 Tolerance±(dB)1.01.01.0 2.4G GFSK ChannelChannel00Channel19Channel39 Target(dBm)0.00.00.0 Tolerance±(dB)1.01.01.0

ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page1of10 TestingReport CustomerName:DongguanJizhiElectronicTechnologyCo.,Ltd. ProductName:InvertedFAntenna(IFA)onPCB SampleModel:JZANT-223 ReferenceStandard:GB/T9410-2008;ANSI/IEEEStd149-1979 IssueDate:2022.12.19 Engineer:Date: Auditor:Date: Approver:Date: ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page2of10 Version VersionNo.DateDescriptionFormulateApproval A02022.12.19Forthefirsttime,formulateJacksonEason Contents 1.GeneralInformation.........................................................................................................................3 1.1Generalinformationoftestinginstitutions...........................................................................3 1.2Testingprinciple...................................................................................................................3 1.3Testequipment......................................................................................................................4 1.4Testenvironment...................................................................................................................4 1.5Statement..............................................................................................................................4 2.SampleInformation.........................................................................................................................5 2.1Clientinformation.................................................................................................................5 2.2DescriptionofEUT(S)..........................................................................................................5 2.3EUTappearance....................................................................................................................6 2.4EUTsetupphotooffreespaceOTAtesting.........................................................................7 3.TestResults......................................................................................................................................8 3.1Teststandard.........................................................................................................................8 3.2Testuncertainty.....................................................................................................................8 3.3Testdata................................................................................................................................9 3.3.1Typicalfreespaceefficiencyandgain......................................................................9 3.3.2Typicalfreespaceradiationpattern...........................................................................9 （Thefollowingisblank）..............................................................................................................10 ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page3of10 1.GeneralInformation 1.1Generalinformationoftestinginstitutions Name ShenzhenRFI-LABCommunicationTechnologyCo.,Ltd. Address 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ Tel 13682621346 E-mail [email protected] Equipment Alltheequipmentusedinthereportisfixedin 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ 1.2Testingprinciple ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page4of10 1.3Testequipment EquipmentModelNo.SerialNo.Manufacturer Calibration date Next calibration date 16probe microwave chamber 3*3*2.5 RFI-LAB-RF -A00 SUNYIELD2021.3.152023.3.14 Network Analyzer E5071C RFI-LAB-RF -A02 Agilent 2022.5.132023.5.12 1.4Testenvironment Temperature 23.8°C Humidity 59%RH Pressure 100.23kPa 1.5Statement (1)Thetestresultsinthereportareonlyapplicabletothetestedsamplesandthetestedsamples workundertheenvironmentdescribedinthereport. (2)OnlyShenzhenRFI-LABCommunicationTechnologyCo.,Ltd.havetherighttomodifythe report,andthemodificationinformationshallbeannotatedintherevisionform. (3)Anyobjectiontothisreportshallberaisedwithin30daysafterformalconfirmationofthe report. (4)Thisreportisinvalidifthereisanyevidencethatthesampleinformationprovidedisfalsified. (5)Thereportisinvalidwithoutthesignatureoftheauditorandapprover. ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page5of10 2.SampleInformation 2.1Clientinformation Name DongguanJizhiElectronicTechnologyCo.,Ltd. Address WestSideof5/F,BuildingH,FasiteIndustryPark,No.89,Liyatang IndustryZone,LincunCommunity,TangxiaTown,Dongguan, Guangdong,China Contacts NaturalZhou Tel / E-mail [email protected] 2.2DescriptionofEUT(S) ProductName InvertedFAntenna(IFA)onPCB SampleModel JZANT-223 Size / SerialNo. / TestItem Antennagain;Radiationpatternandefficiency FrequencyRange 2400MHz-2500MHz ReceivedDate 2022.12.19 TestDate 2022.12.19 Remark ThelengthoftheRFcableis295mm ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page6of10 2.3EUTappearance L12.47mm L22.7mm L35.0mm L42.47mm L52.53mm L66.50mm W10.9mm W20.5mm D13.0mm D20.6mm D35.5mm D40.65mm D51.4mm D61.7mm ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page7of10 2.4EUTsetupphotooffreespaceOTAtesting Planform Frontview ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page8of10 3.TestResults 3.1Teststandard NameParameterMethodStandardno. Mobile communication antenna Antennagain Genericspecification forantennasusedinthe mobilecommunications GB/T 9410-2008 Radiationpattern Antenna Radiationefficiency IEEEStandardTest ProceduresforAntennas ANSI/IEEEStd 149-1979 Gainanddirectivity 3.2Testuncertainty TheuncertaintywascalculatedonthebasisoftheGUMpublishedbyISO,usingthe inclusionfactorofK=2andthe95%confidenceleveltoexpresstheextended uncertainty. ItemUncertainty Antennagain±1dB Radiationefficiency±10% ReportNo.:RFI-LAB-RF-202212-LL19-2 QP030-E11 Page9of10 3.3Testdata 3.3.1Typicalfreespaceefficiencyandgain 3.3.2Typicalfreespaceradiationpattern (1)X-ZPlane: (2)Y-ZPlane: Frequency/MHz 24002410242024302440245024602470248024902500 PeakGain/dBi -3.32-3.66-3.78-3.88-4.06-4.00-4.15-4.40-4.48-4.17-4.15 Efficiency/% 10.419.629.208.908.588.758.477.977.818.148.17 ReportNo.:RFI-LAB-RF-202212-L…

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ProjectNo.:ZKT-221227L9719-1 Page 1 of 42 FCCTESTREPORT FCCID:2AXE4-GK75S ReportNumber.....................................:ZKT-221227L9719-1 DateofTest ....................................................... : Dec.12,2022toDec.30,2022 Dateofissue ......................................... : Jan.04,2023 Totalnumberofpages.......................... 42 TestResult .......................................... :PASS TestingLaboratory. .............................. : ShenzhenZKTTechnologyCo.,Ltd. Address ............................................... : 1/F,No.101,BuildingB,No.6,TangweiCommunityIndustrial Avenue,FuhaiStreet,Bao'anDistrict,Shenzhen,China Applicant'sname ................................ : DongguanJizhiElectronicTechnologyCo.,Ltd. Address...............................................: Room101,Building3,No.1Room201,Building1,No.1,Baoyuan Road,Lianhu,Tangxiatown,Dongguan,China. Manufacturer'sname.........................: DongguanJizhiElectronicTechnologyCo.,Ltd. Address ............................................... : Room101,Building3,No.1Room201,Building1,No.1,Baoyuan Road,Lianhu,Tangxiatown,Dongguan,China. Testspecification: Standard ................................................ : FCCCFRTitle47Part15SubpartCSection15.247 ANSIC63.10:2013 Testprocedure.....................................: / Non-standardtestmethod................:N/A TestReportFormNo........................: TRF-EL-111_V0 TestReportForm(s)Originator ..... : ZKTTesting MasterTRF ........................................ : Dated:2021-08-26 ThisdevicedescribedabovehasbeentestedbyZKT,andthetestresultsshowthattheequipmentunder test(EUT)isincompliancewiththeFCCrequirements.Anditisapplicableonlytothetestedsample identifiedinthereport. Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofZKT,thisdocumentmay bealteredorrevisedbyZKT,personalonly,andshallbenotedintherevisionofthedocument. Productname.......................................:USB+Bluetooth+2.4G3modeKeyboard Trademark...........................................: Skyloong Model/Typereference ......................... : GK75S,GK75XS,AK75S,SK75S,JK-223 Ratings .................................................. :DC3.7Vbybattery(4000mAh);Charginginput:DC5V ProjectNo.:ZKT-221227L9719-1 Page 2 of 42 Testingprocedureandtestinglocation: TestingLaboratory.......................................:ShenzhenZKTTechnologyCo.,Ltd. Address ............................................................ :1/F,No.101,BuildingB,No.6,TangweiCommunity IndustrialAvenue,FuhaiStreet,Bao'anDistrict, Shenzhen,China AlenHe Testedby(name+signature).......................: JoeLiu Reviewer(name+signature).......................: LakeXie Approved(name+signature).......................: ProjectNo.:ZKT-221227L9719-1 Page 3 of 42 TableofContents Page 1.VERSION....................................................................................................................5 2.SUMMARYOFTESTRESULTS................................................................................6 2.1TESTFACILITY.................................................................................................................7 2.2MEASUREMENTUNCERTAINTY....................................................................................7 3.GENERALINFORMATION........................................................................................8 3.1GENERALDESCRIPTIONOFEUT.................................................................................8 3.2DESCRIPTIONOFTESTMODES....................................................................................9 3.3BLOCKDIGRAMSHOWINGTHECONFIGURATIONOFSYSTEMTESTED..............9 3.4DESCRIPTIONOFSUPPORTUNITS(CONDUCTEDMODE)........................................9 3.5EQUIPMENTSLISTFORALLTESTITEMS.................................................................10 4.EMCEMISSIONTEST.............................................................................................11 4.1CONDUCTEDEMISSIONMEASUREMENT..................................................................11 4.1.1POWERLINECONDUCTEDEMISSIONLIMITS..................................................11 4.1.2TESTPROCEDURE................................................................................................11 4.1.3DEVIATIONFROMTESTSTANDARD..................................................................11 4.1.4TESTSETUP...........................................................................................................12 4.1.5EUTOPERATINGCONDITIONS...........................................................................12 4.1.6TESTRESULTS......................................................................................................13 4.2RADIATEDEMISSIONMEASUREMENT......................................................................15 4.2.1RADIATEDEMISSIONLIMITS...............................................................................15 4.2.2TESTPROCEDURE...............................................................................................16 4.2.3DEVIATIONFROMTESTSTANDARD..................................................................16 4.2.4TESTSETUP...........................................................................................................16 4.2.5EUTOPERATINGCONDITIONS...........................................................................17 5.RADIATEDBANDEMISSIONMEASUREMENT.....................................................22 5.1TESTREQUIREMENT:..............................................................................................22 5.2TESTPROCEDURE..................................................................................................22 5.3DEVIATIONFROMTESTSTANDARD.....................................................................22 5.4TESTSETUP..............................................................................................................23 5.5EUTOPERATINGCONDITIONS.............................................…

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ProjectNo.:ZKT-221227L9719-2 Page 1 of 42 FCCTESTREPORT FCCID:2AXE4-GK75S ReportNumber.....................................:ZKT-221227L9719-2 DateofTest ....................................................... : Dec.12,2022toDec.30,2022 Dateofissue ......................................... : Jan.04,2023 Totalnumberofpages.......................... 42 TestResult .......................................... :PASS TestingLaboratory. .............................. : ShenzhenZKTTechnologyCo.,Ltd. Address ............................................... : 1/F,No.101,BuildingB,No.6,TangweiCommunityIndustrial Avenue,FuhaiStreet,Bao'anDistrict,Shenzhen,China Applicant'sname ................................ : DongguanJizhiElectronicTechnologyCo.,Ltd. Address...............................................: Room101,Building3,No.1Room201,Building1,No.1,Baoyuan Road,Lianhu,Tangxiatown,Dongguan,China. Manufacturer'sname.........................: DongguanJizhiElectronicTechnologyCo.,Ltd. Address ............................................... : Room101,Building3,No.1Room201,Building1,No.1,Baoyuan Road,Lianhu,Tangxiatown,Dongguan,China. Testspecification: Standard ................................................ : FCCCFRTitle47Part15SubpartCSection15.247 ANSIC63.10:2013 Testprocedure.....................................: / Non-standardtestmethod................:N/A TestReportFormNo........................: TRF-EL-111_V0 TestReportForm(s)Originator ..... : ZKTTesting MasterTRF ........................................ : Dated:2021-08-26 ThisdevicedescribedabovehasbeentestedbyZKT,andthetestresultsshowthattheequipmentunder test(EUT)isincompliancewiththeFCCrequirements.Anditisapplicableonlytothetestedsample identifiedinthereport. Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofZKT,thisdocumentmay bealteredorrevisedbyZKT,personalonly,andshallbenotedintherevisionofthedocument. Productname.......................................:USB+Bluetooth+2.4G3modeKeyboard Trademark...........................................: Skyloong Model/Typereference ......................... : GK75S,GK75XS,AK75S,SK75S,JK-223 Ratings .................................................. :DC3.7Vbybattery(4000mAh);Charginginput:DC5V ProjectNo.:ZKT-221227L9719-2 Page 2 of 42 Testingprocedureandtestinglocation: TestingLaboratory.......................................:ShenzhenZKTTechnologyCo.,Ltd. Address ............................................................ :1/F,No.101,BuildingB,No.6,TangweiCommunity IndustrialAvenue,FuhaiStreet,Bao'anDistrict, Shenzhen,China AlenHe Testedby(name+signature).......................: JoeLiu Reviewer(name+signature).......................: LakeXie Approved(name+signature).......................: ProjectNo.:ZKT-221227L9719-2 Page 3 of 42 TableofContents Page 1.VERSION....................................................................................................................5 2.SUMMARYOFTESTRESULTS................................................................................6 2.1TESTFACILITY.................................................................................................................7 2.2MEASUREMENTUNCERTAINTY....................................................................................7 3.GENERALINFORMATION........................................................................................8 3.1GENERALDESCRIPTIONOFEUT.................................................................................8 3.2DESCRIPTIONOFTESTMODES....................................................................................9 3.3BLOCKDIGRAMSHOWINGTHECONFIGURATIONOFSYSTEMTESTED..............9 3.4DESCRIPTIONOFSUPPORTUNITS(CONDUCTEDMODE)........................................9 3.5EQUIPMENTSLISTFORALLTESTITEMS.................................................................10 4.EMCEMISSIONTEST.............................................................................................11 4.1CONDUCTEDEMISSIONMEASUREMENT..................................................................11 4.1.1POWERLINECONDUCTEDEMISSIONLIMITS..................................................11 4.1.2TESTPROCEDURE................................................................................................11 4.1.3DEVIATIONFROMTESTSTANDARD..................................................................11 4.1.4TESTSETUP...........................................................................................................12 4.1.5EUTOPERATINGCONDITIONS...........................................................................12 4.1.6TESTRESULTS......................................................................................................13 4.2RADIATEDEMISSIONMEASUREMENT......................................................................15 4.2.1RADIATEDEMISSIONLIMITS...............................................................................15 4.2.2TESTPROCEDURE...............................................................................................16 4.2.3DEVIATIONFROMTESTSTANDARD..................................................................16 4.2.4TESTSETUP...........................................................................................................16 4.2.5EUTOPERATINGCONDITIONS...........................................................................17 5.RADIATEDBANDEMISSIONMEASUREMENT.....................................................22 5.1TESTREQUIREMENT:..............................................................................................22 5.2TESTPROCEDURE..................................................................................................22 5.3DEVIATIONFROMTESTSTANDARD.....................................................................22 5.4TESTSETUP..............................................................................................................23 5.5EUTOPERATINGCONDITIONS.............................................…

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FCCID:2AXE4-GK75S RadiatedEmission (Below1G) RadiatedEmission (Above1G) FCCID:2AXE4-GK75S ConductedEmission