
Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.
100mm Universal iPad Model - 10-inch Backlit YZW Keyb (CQ030 Luminous Edition Bluetooth keyboard)
chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd 6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China AttestationStatements NotCoveredEntityApplicant&NotCoveredEquipment To:FederalCommunicationsCommissionDate:Jan.8,26 7435OaklandMillsRoad, Columbia,MD21046,USA Ref:InformationRequiredbySection2.911(d)(5)(i)&(ii) FCCID:2BDM3-CQ030LUMINOUS chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd(“theapplicant”)certifiesthat,asofthedate ofthefilingoftheapplication,theapplicantisnotidentifiedontheCoveredList,establishedpursuantto §1.50002ofreferencechapter,asanentityproducing“covered”communicationequipment.The equipmentforwhichauthorizationissoughtisnot“covered”telecommunicationsequipmentandvideo surveillanceequipmentproducedbyentitiesidentifiedontheCommission’sCoveredListthatprohibited fromreceivinganequipmentauthorizationpursuanttosection§2.903oftheFCCrules. Sincerelyyours, ApplicantSignature PrintedName:JianqiangZhang Title:Manager Address:6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China Tel.:13798311319 Email:[email protected]
chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd 6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China 1|Page AttestationStatements To:FederalCommunicationsCommissionDate:Jan.8,26 7435OaklandMillsRoad, Columbia,MD21046,USA Subject:AttestationofCompliancewithFCCCoveredListSoftwareRequirements FCCID:[2BDM3-CQ030LUMINOUS] ProductName:[UniversaliPadModel-10-inchBacklitYZWKeyb(CQ030LuminousEditionBluetooth keyboard)] Thisletterservesasanattestationthattheequipmentidentifiedabove☐is/☒isnot(selectone)"covered" softwareasdefinedundertheFederalCommunicationsCommission(FCC)CoveredListrequirements,as outlinedinFCC22-84andKDB986446. Specifically,theundersignedcertifiesthattheequipmentforwhichauthorizationissought: 1.Doesnotcontaincybersecurityoranti-virussoftwareproducedorprovidedbyKasperskyLab, Inc.oranyofitssuccessors,assignees,parents,subsidiaries,affiliates,oranyentitythathasrebranded orrelabeledsoftwareproducedbytheaforementionedentities. 2.Doesnothavethecapabilitytostore,run,ordeliveranysoftwareidentifiedontheFCCCoveredList, includingbutnotlimitedtocybersecurityandanti-virussoftware. Tosupportthisattestation,theappendixevaluationdocumentationhasbeenpreparedandisincludedinthe certificationfiling. Thisattestationisbasedonathoroughevaluationofthedevice'sdesign,functionality,andsoftware environment.Theundersignedaffirmsthattheinformationprovidedisaccurateandcompletetothebestof theirknowledge. Sincerelyyours, ApplicantSignature PrintedName:JianqiangZhang Title:Manager Address:6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China Tel.:13798311319 Email:[email protected] chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd 6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China 2|Page EvaluationregardingtotheCoveredListSoftware: Compliance Methodology EvaluationProcessResults Deviceis Inherent compliance ☒ TheChipset(s)usedislimitedtorun theCybersecurityoranti-virus software. Compliance ☒ TheMemoryusedislimitedtorunthe Cybersecurityoranti-virussoftware. Compliance ☒ Thereisstoragecapacitylimitationfor storeorinstalltheCybersecurityor anti-virussoftware. Compliance ☒ Operatingsystemusedislimitedto run,installordelivertheCybersecurity oranti-virussoftware. Compliance Deviceisnot Inherent compliance ☐ EvaluationBasedonSoftware BillofMaterials(SBoM) ☐ EvaluationBasedonScanfor Softwareonthedevice ☐ EvaluationBasedonFilesystemscan ☐ EvaluationBasedonRunning softwarecheck
chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd 6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China U.S.AgentLetterofAttestation To:FederalCommunicationsCommission 7435OaklandMillsRoad,Columbia,MD21046,USA Date:Jan.14,26 Ref: AttestationStatement–Part 2.911(d)(7)filing FCCID:2BDM3-CQ030LUMINOUS chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd(“theapplicant”)certifiesthat,asofthedate ofthefilingoftheapplication,[LOBOSIOWAINC](“theagent”)isourdesignatedU.S.agentfor serviceofprocessfortheabovereferenceFCCID.Theapplicantacceptstomaintainanagentfor serviceofprocessintheUnitedStatesfornolessthanoneyearaftereitherthegranteehas permanentlyterminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S., ortheconclusionofanyCommission-relatedadministrativeorjudicialproceedinginvolvingthe equipment,whicheverislater.Theapplicantfurtheracknowledgesitisourresponsibilitytoinform theFCCwhenevertheagentinformationchanges. [LOBOSIOWAINC]("theagent)understanditistheagent'sobligationtoacceptserviceofprocess intheUnitedStatesformattersrelatedtotheapplicableequipment,andatthephysicalU.S. addressandemailaddress. DesignatedU.S.Agent CompanyName:LOBOSIOWAINC FRN:0036413961 Address:4623BittercreekDrColoradoSpringsco 80922Us Signature: ContactPerson:HarleyLi Tel:(818)818-0583Email:[email protected] Applicant CompanyName:chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd Address:6/F,Unit2,HongxinSciencePark,No. 20,BeizongRoad,QishiTown,DongguanCity,China FRN:0034498253 Signature: ContactPerson:JianqiangZhang Tel:13798311319Email:[email protected]
chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd 6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China 1/8/2026 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:ConfidentialityRequestfor:FCCID:2BDM3-CQ030LUMINOUS PursuanttoSections0.457and0.459oftheCommission’sRules,weherebyrequestpermanent confidentialtreatmentoftheexhibitsaccompanyingthiscertificationapplicationasoutlinedbelow: BlockDiagram Schematics OperationalDescription Theaboveexhibitscontaintradesecretsand/orproprietaryinformationthatarenotpubliclyavailableand materialsthattheApplicanthasspentconsiderableeffortsindeveloping.Publicdisclosureofthesemay beharmfultotheApplicantandgiveanunfairadvantagetocompetitorsonthemarket. Sincerely, (Signature) PrintedName:JianqiangZhang Title:Manager Address:6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China Tel.:13798311319 Email:[email protected]
chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd 6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China Date:Jan.8,26 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Subject:AgentAuthorizationforFCCID:2BDM3-CQ030LUMINOUS I,theundersigned,herebyauthorize(CTSLTesting(Dongguan)Co.,Ltd.)toactonourbehalfinall mattersrelatingtothisapplicationforequipmentcertification. Anyactcarriedoutby(CTSLTesting(Dongguan)Co.,Ltd.)shallhavethesameeffectasourownandI acknowledgethatallresponsibilityforcomplyingwiththetermsandconditionsofcertification,as specifiedbyDERYCOMCERTIFICATIONSERVICES,INC.,stillresideswith(chuanqiang(dongguan) ElectronicTechnologyCo.,Ltd). WecertifythatwearenotsubjecttoadenialoffederalbenefitsthatincludesFCCbenefitspursuantto Section5301oftheAnti-DrugAbuseActof1988,21U.S.C.§862,andthatnopartytotheapplication,as definedin47CFR§1.2002(b),issubjecttoadenialoffederalbenefitsthatincludesFCCbenefits pursuanttothatsection. Sincerely, ApplicantSignature: PrintedName:JianqiangZhang Title:Manager Address:6/F,Unit2,HongxinSciencePark,No.20,BeizongRoad,QishiTown,DongguanCity,China Tel.:13798311319 Email:[email protected]
chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd ProductSimilarityDeclaration EUTDescription:UniversaliPadModel-10-inchBacklitYZW Keyb(CQ030LuminousEditionBluetoothkeyboard) ModelNo.:UniversaliPadModel-10-inchBacklitYZWKeyb- Black SeriesModel:slateblue,WatermelonRed,blue-grey,lilac,blue haze,lavender,DustyPink,greyishwhite,deepcherry,pine green We(chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd) herebystateThedifferencesbetweenmodelsarelimitedtothe fronttrimpanel,housingcolor,knobandbuttoncolors,speaker color,andlightringconfiguration,Noimpactonelectrical performanceandRFcircuits. Signature: Name:JianqiangZhang Title:Manager Place,date:Jan.14,2026
Page1of5 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexA. EUTExternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com AnnexA. EUTExternalPhotos Photo1ExternalphotosofEUT Photo2ExternalphotosofEUT Page2of5 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexA. EUTExternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo3ExternalphotosofEUT Photo4ExternalphotosofEUT Page3of5 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexA. EUTExternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo5ExternalphotosofEUT Photo6ExternalphotosofEUT Page4of5 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexA. EUTExternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo7ExternalphotosofEUT Photo8ExternalphotosofEUT Page5of5 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexA. EUTExternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo9ExternalphotosofEUT Photo10ExternalphotosofEUT ------------------------------------------EndofEUTExternalPhotos------------------------------------------
LabelandLabelLocation FCCID:2BDM3-CQ030LUMINOUS L*W:10mm*5mm labelandWhitefont
Page1of3 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexB. EUTInternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com AnnexB. EUTInternalPhotos Photo1InternalphotosofEUT Photo2InternalphotosofEUT Page2of3 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexB. EUTInternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo3InternalphotosofEUT Photo4InternalphotosofEUT Antennaposition Page3of3 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexB. EUTInternalPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo5InternalphotosofEUT ------------------------------------------EndofEUTInternalPhotos------------------------------------------
Page1of1 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER RFExposure Evaluation FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com RFExposureEvaluation EUTDescription:UniversaliPadModel-10-inchBacklitYZWKeyb(CQ030LuminousEditionBluetooth keyboard) ModelNo.:UniversaliPadModel-10-inchBacklitYZWKeyb-Black FCCID:2BDM3-CQ030LUMINOUS Equipmenttype:Portabledevices AccordingtoKDB447498D01GeneralRFExposureGuidancev06andpart2.1093,Unlessspecificallyrequired bythepublishedRFexposureKDBprocedures,standalone1-gheadorbodyand10-gextremitySARevaluation forgeneralpopulationexposureconditions,bymeasurementornumericasimulation,isnotrequiredwhenthe correspondingSARTestExclusionThresholocondition(s),listedbelow,is(are)satisfied. For100MHzto6GHzandtestseparationdistances<50mm,the1-gand10-gSARtestexclusionthresholdsare determinedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparationdistancemm)]·[vfGHz)]<3.0for 1-gSAR,ands7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation Theresultisroundedtoonedecimalplaceforcomparison Conclusion:So,SARtestisnotrequired --------------------------------------EndofRFExposureEvaluation-------------------------------------- conducted power (dBm) Max tune-up(mW) Frequency(MHz)Min. distance(mm) Calc. thresholds limit 1.041.2706 24025 0.3938 3.0 -0.590.8730 24405 0.2727 3.0 -0.180.9594 24805 0.3022 3.0
ITEM SPEC. Antenna Type Type_2_single wiggle Center Frequency 2402 MHz 2441 MHz 2480 MHz 2.34 dBi 2.07dBi 1.45 dBi MAX. GAIN 2.34 dBi Polarization Horizontal Azimuth Beam PatternOmni-directional Impedance 50 Ω Antenna Length 3.1cm Antenna Specification Specifications Summary Antenna Antenna Photo & Length (mm) Test Address 16 Tzu Chiang Road, Hsinchu Industrial District Hsinchu Hsien 303, Taiwan Test Date 2009-04-14 Test Instrument vector network analyzer - R&S ZVB20 14.4 mm 5.4 mm 4.0 mm 3.0 mm Average Gain(dBi) : -2.48 Mini mum Gain(dBi): -55.18 1. Main antenna : 2402 MHz 1.1 Horizontal Frequency(MHZ): 2402 Antenna Polarity: Horizontal Maximum Value(dBi): 2. 34 Average Gain(dBi) : -8.98 Mini mum Gain(dBi): -62.3 1.2 Vertical Frequency(MHZ): 2402 Antenna Polarity: Vertical Maximum Value(dBi): -4.51 Average Gain(dBi) : -2.54 Mini mum Gain(dBi): -66.98 2. Main antenna : 2441 MHz 2.1 Horizontal Frequency(MHZ): 2441 Antenna Polarity: Horizontal Maximum Value(dBi): 2.07 Average Gain(dBi) : -8.81 Mini mum Gain(dBi): -51.4 2.2 Vertical Frequency(MHZ): 2441 Antenna Polarity: Vertical Maximum Value(dBi): -4.29 Average Gain(dBi) : -3.34 Mini mum Gain(dBi): -53.4 2. Main antenna : 2480 MHz 2.1 Horizontal Frequency(MHZ): 2480 Antenna Polarity: Horizontal Maximum Value(dBi): 1.45 2.2 Vertical Frequency(MHZ): 2480 Antenna Polarity: Vertical Maximum Value(dBi): -4.95 Average Gain(dBi) : -9.06 Minimum Gain(dBi): -60.00
Page1of46 FCCPART15SUBPARTC FCCPART15.247 TESTREPORT FCCID:2BDM3-CQ030LUMINOUS ReportNo:CTSL2521220071ER ProductName: UniversaliPadModel-10-inchBacklitYZWKeyb (CQ030LuminousEditionBluetoothkeyboard) MainTestModel:UniversaliPadModel-10-inchBacklitYZWKeyb-Black SeriesModels: slateblue,WatermelonRed,blue-grey,lilac,bluehaze, lavender,DustyPink,greyishwhite,deepcherry,pine green(Thedifferencesbetweenmodelsarelimitedtothe fronttrimpanel,housingcolor,knobandbuttoncolors, speakercolor,andlightringconfiguration,Noimpacton electricalperformanceandRFcircuits) Applicant:chuanqiang(dongguan)ElectronicTechnologyCo.,Ltd EXECUTIVESUMMARY Asampleofthisproductwastestedandfoundtobeincompliancewith FCCPART15C,FCCPART15SUBPARTC(15.247). Anyreproductionofthisdocumentmustbedoneinfull.Nosinglepartofthisdocumentmay bereproducedwithoutpermissionfromCTSL.AllTestDataPresentedinthisreportisonly applicabletopresentedTestsample. CTSLTesting(Dongguan)Co.,Ltd. Maincompanyaddress:HexingBuilding,HoujieAvenue,HoujieRoadHoujieTown, GuangdongProvinceDongguanCity,People’sRepublicofChina Page2 of 46 CTSL Testing(Dongguan)Co., Ltd. ReportNo. :CTSL2521220071ER Room112, Building1, No. 15, Jiaoyuansongshan,HetianVill tage, HoujieTown,DongguanCity, Guangdong,China. Tel: 0769-86009597E-mail:[email protected]://www.ctsl-lab.com Test Report FCC ID:2BDM3-CQ030LUMINOUS Applicant Name chuanqiang(dongguan)ElectronicTechnologyCo., Ltd Applicant Address 6 / F, Unit 2, HongxinSciencePark,No. 20,BeizongRoad,Qishi Town,DongguanCity, China Manufacturer Name chuanqiang(dongguan)ElectronicTechnologyCo., Ltd Manufacturer Address 6 / F, Unit 2, HongxinSciencePark,No. 20,BeizongRoad,Qishi Town,DongguanCity, China TradeMark-- Productname UniversaliPad Model- 10-inchBacklitYZWKeyb(CQ030LuminousEdition Bluetoothkeyboard) Main Test Model UniversaliPad Model- 10-inchBacklitYZWKeyb-Black SeriesModelsSee the first pageof the report Standard FCC Part 15 SubpartC (15.247) ANSI C63.10:2020 FCC KDB 558074D01 15.247Meas Guidancev05r02 Test Location ISO/IEC17025by ILAC-MRAis A2LA7556.01 CTSLTesting(Dongguan)Co., Ltd. Room112, Building1, No. 15, JiaoyuansongshanHetianVillage,HoujieTown DongguanCity, Guangdong,People’s Republicof China ReceiptDate2025.12.10Test period2025.12.10-2025.12.25Issue Date2025.12.25 Conclusion The equipmentundertest was foundto be compliancewith the requirementsof the standardsapplied. Performs Testing: EthanZhao Test Report Reviewer: SteveQin Test Report Authorizer: Alan Li (Special seal) Page3of46 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com TABLEOFCONTENTS DescriptionPage TESTREPORTVERIFICATION ...................................................................................................................... 3 1.GENERALINFORMATION........................................................................................................................5 1.1.GeneralDescriptionofEUT(EquipmentUnderTest).......................................................................5 1.2.AntennaInformation................................................................................................................................6 1.3.InformationofRFCable..........................................................................................................................6 2.SUMMARYOFTEST................................................................................................................................7 2.1.TestStandards.........................................................................................................................................7 2.2.Summaryoftestresult............................................................................................................................7 2.3.TestFacilities............................................................................................................................................8 2.4.Measurementuncertainty.......................................................................................................................9 2.5.BlockDiagram........................................................................................................................................10 2.6.Assistantequipmentusedfortest.......................................................................................................10 2.7.ChannelList............................................................................................................................................11 2.8.PowerSettingofTestSoftware...........................................................................................................11 2.9.TestEquipment......................................................................................................................................12 3.6DBBANDWIDTH.............................................................................................................................14 3.1.Limit..........................................................................................................................................................14 3.2.TestSetup...............................................................................................................................................14 3.3.SpectrumAnalyzerSetting...................................................................................................................14 3.4.TestProcedure.......................................................................................................................................14 3.5.TestResult..............................................................................................................................................15 3.6.OriginalTestrecord..................................................................................................…
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Page1of2 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexC. TestSetupPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com AnnexC. TestSetupPhotos Photo1TestSetupPhotosofRadiatedEmissionTest(30-1000MHz) Photo2TestSetupPhotosofRadiatedEmissionTest(Above1GHz) Page2of2 CTSLTesting(Dongguan)Co.,Ltd. ReportNo.:CTSL2521220071ER AnnexC. TestSetupPhotos FCCID:2BDM3-CQ030LUMINOUS Room112,Building1,No.15,Jiaoyuansongshan,HetianVilltage,HoujieTown,DongguanCity,Guangdong,China. Tel:0769-86009597E-mail:[email protected]://www.ctsl-lab.com Photo4TestSetupPhotosofACPowerLineConductedEmissions ------------------------------------------EndofTestSetupPhotos------------------------------------------
4623 Bittercreek Dr · Colorado Springs, Colorado, 80922 · United States
| # | Rule Parts | Frequency Range | Power Output |
|---|---|---|---|
| 1 | 15C | 2.40 GHz - 2.48 GHz | 1.27 mW |

Bluetooth keyboard
Equipment Class
DTS - Digital Transmission System
Bluetooth keyboard
Equipment Class
DTS - Digital Transmission System