2BW48-D73Bluetooth RF Module

1 D73-nRF52840C08ProductSpecification nRF528402.4GHzBLE4.2/5.0 LowEnergyBluetoothModule ShenzhenDaxiongIntelligentCo.,Ltd.D73-nRF52840C08ProductSpecification Copyright©深圳市大熊智能有限公司 2 TableofContents Chapter1ProductOverview ............................................................................................................................................ 4 1.1 ProductIntroduction ........................................................................................................................................... 4 1.2 Features&Functions ........................................................................................................................................... 4 1.3 ApplicationScenarios ......................................................................................................................................... 5 Chapter2SpecificationParameters ...................................................................................................................... 5 2.1 AbsoluteMaximumRatings .............................................................................................................................. 5 2.2 OperatingParameters .............................................................................................................................................. 6 2.3 MainParameterSummaryTable ......................................................................................................................... 7 Chapter3MechanicalDimensions&PinDefinition .............................................................................. 8 Chapter4Development&Usage ................................................................................................................................. 11 Chapter5BasicOperation ............................................................................................................................................ 12 5.1 HardwareDesign&CircuitSchematic ................................................................................................. 12 Chapter6FrequentlyAskedQuestions ............................................................................................................... 14 6.1 UnsatisfactoryTransmissionDistance ............................................................................................ 14 6.2 ModulePronetoDamage .................................................................................................................................. 14 6.3 HighBitErrorRate ......................................................................................................................................... 14 Chapter7SolderingOperationGuidelines .................................................................................................... 15 7.1 ReflowSolderingTemperatureProfile .............................................................................................. 15 7.2 ReflowSolderingCurve .................................................................................................................................... 15 Chapter8RelatedModels ............................................................................................................................................ 16 8.1 RelatedHardwareModules ............................................................................................................................... 16 8.2 RelatedProtocolModules ............................................................................................................................... 16 Chapter9BulkPackagingMethod ............................................................................................................................ 16 RevisionHistory ....................................................................................................................................................................... 17 AboutUs ......................................................................................................................................................................................... 17 ShenzhenDaxiongIntelligentCo.,Ltd.D73-nRF52840C08ProductSpecification Copyright©深圳市大熊智能有限公司 3 Disclaimer&CopyrightNotice Theinformationinthisdocument,includingreferenceURLs,issubjectto changewithoutpriornotice.Thisdocumentisprovided"asis"withoutany warrantyofanykind,includingwarrantiesofmerchantability,fitnessfora particularpurposeornon-infringement.Noliabilityisassumedforanypatent infringementarisingfromtheuseofinformationcontainedherein.No intellectualpropertylicense,expressorimplied,isgrantedbyestoppelor otherwiseunderanypatents,trademarksorcopyrightsmentionedinthis document. AlltestdatastatedhereinareobtainedfromDaxiongIntelligentLaboratory; actualresultsmayvaryslightly. Alltrademarks,tradenamesandregisteredtrademarksmentionedinthisdocument belongtotheirrespectiveowners. ThefinalinterpretationrightbelongstoShenzhenDaxiongIntelligentCo.,Ltd. Notes Duetoproductversionupgradesorotherreasons,thecontentofthis manualmaybemodified.DaxiongIntelligentreservestherighttorevisethe contentofthismanualwithoutpriornoticeorreminder.Thismanualservesonly asausageguide.ShenzhenDaxiongIntelligentCo.,Ltd.endeavorstoprovide accurateinformationinthismanual,butdoesnotguaranteethatthemanualis completelyerror-free.Allstatements,informationandsuggestionsinthis manualdonotconstituteanyexpressorimpliedwarranty. ShenzhenDaxiongIntelligentCo.,Ltd.D73-nRF52840C08ProductSpecification Copyright©ShenzhenDaxiongIntelligentCo.,Ltd. 4 Chapter1ProductOverview 1.1ProductIntroduction 1.2Features&Functions Ultra-smallsize:only13×18mm SupportsBLE4.2andBLE5.0 Maximumtransmitpower6mWwithmulti-levelsoftwareadjustment Compliantwithgloballicense-freeISM2.4GHzfrequencyband Built-inhigh-performancelow-powerARM®Cortex®-M4processor Abundantstorageresources:1024KBFLASH,256KBRAM Supports1.7~5.5Vpowersupply;optimalperformanceguaranteedatsupply voltage≥3.3V Industrial-gradedes…

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TCBCALLpágina1 FileFCCID: 2BW48-D73 PleaseuploadanexhibitthatexplainshowdoestheTCBverifythenewagentinformation: 1-IstheaddressoftheagentavalidphysicalUSmailingaddress(notaUSpostofficebox,notavirtualmailbox,notP.O.Boxes,notavacantlot,notapublicbuilding, etc.) ○Wehavecheckediftheaddressexistsinarealandpotentialbuilding(Googlemaps)+officialUSregister,afterthisverificationandtheevidencebelowwecan guaranteethefollowing: notaUSpostofficebox notavirtualmailbox notP.O.Boxes notavacantlot notapublicbuilding(note) ►WecheckedtheFCCFRNSearchbasedontheinformationprovidedbythegrantee. Officialdocument： TCBCALLpágina2 TCBCALLpágina3 Ingoogle: HoweverafterdeeplyinvestigateIcouldsee: TCBCALLpágina4 TCBCALLpágina5 TCBCALLpágina6 TCBCALLpágina7 ►CONCLUSIONbyTCB:TheASOPdefinedandprovidedbygranteeisVALIDandconfirmed.Thereforetheexhibit"C5266091_X23_Ed1_US_Agent_Letter(6)(1)" includedinthefileisok. 2-IstheagentphysicallylocatedatthatvalidUSaddresssuchthattheagentcanbelegallyservedatthataddress? Yes,checkabove 3-Hasthelistedagentclearlyagreedinwritingtoserveastheagentforthegranteeatthataddress? Yes,itisincludedintheexhibit"C5266091_X23_Ed1_US_Agent_Letter(6)(1)" >

1/1 US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: Opuor INC FRN: 0036496966 Contact Name: Shuiqing Yang Address: 6510 S Academy Biva Ste A 642 Colorado Springs, CO 80906 United States Telephone No: (650)3156698 Email: [email protected] Applicant: Company name:Shenzhen Daxiong Intelligence Co., Ltd. Product Description:Bluetooth RF Module Grantee code:2BW48 FRN:0038661955 FCC ID:2BW48-D73 Contact Name:kimi ouyang Address: Room 806-808, Tangdong Optoelectronics R&D Building, Bao'an, Shenzhen, Guangdong China Telephone No.:18520822005 Email:[email protected] [Shenzhen Daxiong Intelligence Co., Ltd.] certifies that, as of the date of this filing of the application with the TCB, [Opuor INC] is our designated US agent for service of process for the above referenced FCC ID. [Shenzhen Daxiong Intelligence Co., Ltd.] accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any commission related proceeding involving equipment. [Opuor INC] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Date: 2026.7.28 Applicant’s Name: kimi ouyang US Agent’s Name: Opuor INC Title:manager Title: Manager Signature Signature

AttestationStatement. OldCode:C526609124NewCode:00015544Ed.3 Changereason:FRNisaddedtotheApplicantinformationsection. 1/1 TO: OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 TheCommissionadoptedrulesthatprohibitequipmentauthorizationfor“covered” telecommunicationsequipmentandvideosurveillanceequipmentproducedbyentitiesidentified ontheCommission’sCoveredList 1 ,whichisperiodicallyupdated.SeetheCoveredListformore details.ThisAttestationStatementistoconfirmthatwefollowtheSection2.911(d)(5)(i)-(ii) Applicant Companyname:ShenzhenDaxiongIntelligenceCo.,Ltd. Granteecode:2BW48 FRN:0038661955 FCCID:2BW48-D73 ContactName:kimiouyang Address:Room806-808,TangdongOptoelectronicsR&DBuilding,Bao'an,Shenzhen, GuangdongChina TelephoneNo.:18520822005 Email:[email protected] i.ShenzhenDaxiongIntelligenceCo.,Ltd.(“theapplicant”)certifiesthatthe ii.equipmentforwhichauthorizationissoughtisnot“covered”equipment prohibitedfromreceivinganequipmentauthorizationpursuanttosection 2.903oftheFCCrules.Theapplicantmustsignthiscertification. iii.ShenzhenDaxiongIntelligenceCo.,Ltd.(“theapplicant”)certifiesthat,asof thedateofthefilingoftheapplication,theapplicant[isnot](asaspecifically namedentityoranyofitssubsidiariesoraffiliates)identifiedontheCovered Listasanentityproducing“covered”equipment.Theapplicantmustsign thiscertification. [ShenzhenDaxiongIntelligenceCo.,Ltd.](“theapplicant”)certifiesthat,asofthe dateofthefilingofthe application,theapplicant[isnot]identifiedontheCoveredList asanentityproducing“covered” equipment. Date:2026.7.28 Applicant’sName:kimiouyang Title:manager Signature 1 TheCommission’sCoveredListispublishedbythePublicSafetyandHomelandSecurityBureauandpostedonthe Commission’swebsite.ThisCoveredList,whichisperiodicallyupdated,identifiesparticularequipment,producedby particularentities,thatconstitutes“covered”equipment.https://www.fcc.gov/supplychain/coveredlist

ShenzhenDaxiongIntelligenceCo.,Ltd. Code00018768Ed.2 Item1.Thedeviceisabletoinstallsoftware/programinstallation? ☐ Yes,gotoItem2. ☒ No.Inthiscase,therestoftheitemsdonotapply.ThedevicecannotsupportinstallationofKaspersky cybersecurityoranti-virussoftware. Item2.TechnicalRequirementsforKasperskyCybersecuritySoftware: #GeneralRequirements(ForallDevices)Yes/NoorN/AComments 1Internetconnectionforactivationandupdates(ForallOperating Systems) N/A #GeneralRequirements(ForWindowsDevices)Yes/NoorN/AComments DeviceBluetoothRFModule CompanynameShenzhenDaxiongIntelligenceCo.,Ltd. Granteecode2BW48 FCCID2BW48-D73 FRN0038661955 Contactnamekimiouyang AddressRoom806-808,TangdongOptoelectronicsR&D Building,Bao'an,Shenzhen,GuangdongChina Telephonenumber18520822005 [email protected] Chipset/moduleinformation OperatingSystem(ifapplicable) StorageCapacity(harddriveorother permanentmemorystorage,ifapplicable) nRF52840 N/A N/A 2 1Storage:1500MBfreespaceontheharddriveN/A 2OperatingSystem: MicrosoftWindows8,8.1,10&11Home/Pro/Enterprise Microsoft Windows7Starter/HomeBasic&Premium/Professional/ UltimateSP1orhigher N/A 3Processor:1GHzorhigher(x86orx64)N/A 4Memory(RAM)1GB(32-bit)or2GB(64-bit)N/A 5ScreenResolution:Minimumresolutionof1024x768N/A #GeneralRequirements(FormacOSdevices)Yes/NoorN/AComments 1OperatingSystemmacOS®13–14N/A 2Memory(RAM)4GBN/A 3Storage:3455MBfreespaceontheharddriveN/A #GeneralRequirements(ForAndroidDevices)Yes/NoorN/AComments 1Storage:150MBfreespaceN/A 2OperatingSystem:Android™10–14N/A 3ScreenResolution:Minimumresolutionof320x480N/A #GeneralRequirements(foriOSdevices)Yes/NoorN/AComments 1Storage:150MBfreespaceN/A 2OperatingSystem:iOS®17N/A #GeneralRequirements(ForLinuxsystem)Yes/NoorN/AComments 1Harddrive:1GBoffreespaceN/A 3 2CPU:IntelPentium1GHzorhigherN/A 3RAM:1GBN/A 4Minimumsoftwarerequirements: AlmaLinuxOS8orlater; AlterOS7.5orlater; AstraLinuxCommonEdition2.12orlater; CentOS6.7orlater; DebianGNU/Linux10.0orlater; EulerOS2.0orlater; OracleLinux7.3orlater; RedHatEnterpriseLinux6.7orlater; RockyLinux8.5orlater; SUSELinuxEnterpriseServer12.5orlater; Ubuntu12.04orlater; UncomOSHome/Business/Education/Enterprise2.2orlater; ALTLinuxWorkstaton/WorkstationK/Server/Education8or later; ROSALinuxWorkstation/Server12orlater; REDOS7.3andlater; N/A Afterreviewedthetechnicalrequirements,isthedevicecapableofsupportingtheinstallationof Kasperskysoftware? ☐Yes,gotoItem3. ☒ No.Inthiscase,therestoftheitemsdonotapply.ThedevicecannotsupportinstallationofKaspersky software Item3.ConnectivityCapabilities: 4 #PhysicalInterfacePurposeJustification 1 1 #WirelessInterfacePurposeJustification 1 1 Afterthereviewofthisitems,thedevice: ☒Cannotsupportinstallationofanycybersecurityoranti-virussoftwareonthecoveredlist. ☐ Potentiallycanoperatewithanycybersecurityoranti-virussoftwareonthecoveredlist–additionalthird- partyproofisprovidedtodemonstratecompliancewithrequirementsasof2.911(d)5(i),(ii)–“Proofof CompliancewithCoveredListSoftwareRequirements”ofthisdocumentapplies Signature:Name:kimiouyang Date:2026.7.28 Oncethedocumentisfilledin,pleaseproceedtoprintaPDFofthisWord 1 Thejustificationfieldisusedtojustifywhythesoftwarecannotbereceivedthroughthatinterface.Checktheannexformore indications.

ShenzhenDaxiongIntelligenceCo.,Ltd. ProductSimilarityDeclaration Productname:BluetoothRFModule Modelname:D73-nRF52840C08 D73-nRF52840C08-AT,D73-nRF52840C08-AT101, D73-nRF52840C08-AT102,D73-nRF52840C08-AT103, D73-nRF52840C08-AT104,D73-nRF52840C08-AT105, D73-nRF52840C08-AT106,D73-nRF52840C08-AT107, D73-nRF52840C08-AT108,D73-nRF52840C08-AT109, D73-nRF52840C08-AT110,D73-nRF52840C08-AT111, D73-nRF52840C08-AT112,D73-nRF52840C08-AT113, D73-nRF52840C08-AT114,D73-nRF52840C08-AT115, D73-nRF52840C08-AT116,D73-nRF52840C08-AT117 TradeName:N/A FCCID:2BW48-D73 We(ShenzhenDaxiongIntelligenceCo.,Ltd.)hereby statethatallthemodelsareelectricalidenticalincludingthesame softwareparameterandhardwaredesign(i.e.,circuitdesign,PCB Layout,RFmodule/circuit,antennatype(s)andantennalocation, componentsonPCB,etc.,),samemechanicalstructureand design(includingproductenclosure,materials,etc.,),Theonly differenceisthemodelname. Signature: Name:kimiouyang Title:manager Place:Room806-808,TangdongOptoelectronicsR&DBuilding,Bao'an,Shenzhen, Guangdong,China Date:Jul.30,2026

C5266091_X10_Ed.2 1/1 ShenzhenDaxiongIntelligenceCo.,Ltd. OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 Date:2026.7.28 Subject:RequestforConfidentiality FCCID:2BW48-D73 ToWhomItMayConcern, PursuanttotheprovisionsofSections0.457and0.459ofCommission'srules (47CFR0.457,0.459),wearerequestingtheCommissiontowithholdthefollowing attachment(s)asconfidentialdocumentfrompublicdisclosure. ExhibitsLong-Term Confidentiality Short-Term Confidentiality NOTE2 IDLabel/LocationNoNo AttestationStatementNoNo ExternalPhotosNo ☐ BlockDiagram ☒☐ Schematics ☒☐ TestReportNoNo TestSetupPhotosNo ☐ User’sManual ☐ NOTE 1 ☐ InternalPhotos ☐ NOTE 1 ☐ PartsList/TuneUp ☐☐ RFExposureInfoNoNo OperationalDescription ☒☐ CoverLetter(s)NoNo SDRSoftware/SecurityInfo ☐ No NOTE1:Long-TermConfidentialitymaybepermittedunderspecialconditions(SeeII.LONG-TERMCONFIDENTIALITY,Section3of KDB726920,uselastinforce) NOTE2:Short-TermConfidentialitycanberequestedforamaximumof180daysfromthedateofthegrant. Abovementioneddocumentcontainsdetailedsystemandequipmentdescriptionare consideredasproprietaryinformationinoperationoftheequipment.Thepublic disclosureofabovedocumentsmightbeharmfultoourcompanyandwouldgive competitoranunfairadvantageinthemarket. Incaseofshort-termConfidentiality,theapplicantrequeststheexhibitsselected abovearewithheldfrompublicviewforaperiodof______daysfromthedateofthe GrantofEquipmentAuthorizationandpriortomarketing. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondentduringcertificationreviewprocesscannotbegrantedasconfidential documentsandthoseinformationwillbeavailableforpublicreviewoncethegrantof equipmentauthorizationisissued. C5266091_X10_Ed.2 1/1 Sincerely, Signature: Name:kimiouyang Title:manager

C5266091_X8_Ed.1 1/1 LetterofAuthorization ShenzhenDaxiongIntelligenceCo.,Ltd. Company:ShenzhenDaxiongIntelligenceCo.,Ltd. Address:Room806-808,TangdongOptoelectronicsR&DBuilding, Bao'an,Shenzhen,GuangdongChina ProductName:BluetoothRFModule ModelNumber:D73-nRF52840C08,D73-nRF52840C08-AT,D73- nRF52840C08-AT101,D73-nRF52840C08-AT102,D73-nRF52840C08- AT103,D73-nRF52840C08-AT104,D73-nRF52840C08-AT105,D73- nRF52840C08-AT106,D73-nRF52840C08-AT107,D73-nRF52840C08- AT108,D73-nRF52840C08-AT109,D73-nRF52840C08-AT110,D73- nRF52840C08-AT111,D73-nRF52840C08-AT112,D73-nRF52840C08- AT113,D73-nRF52840C08-AT114,D73-nRF52840C08-AT115,D73- nRF52840C08-AT116,D73-nRF52840C08-AT117 FCCIdentifier:2BW48-D73 WeauthorizeLGAITechnologicalCenterS.A.,RondadelaFontdelCarme,s/n, 08193Bellaterra,Spain,toactonourbehalfonallmattersconcerningthe abovenamedequipment. AnyindividualwithinLGAITechnologicalCenterS.A.isauthorizedtoactonour behalfandtakeactionontheapplication. WedeclarethatauthorizeLGAITechnologicalCenterS.A.,RondadelaFontdel Carme,s/n,08193Bellaterra,Spain,isallowedtoforwardallinformation relatedtotheapprovalprojecttotheFederalCommunicationCommissionand todiscussanyissuesconcerningtheapprovalapplication.Anyandallacts carriedoutbyLGAITechnologicalCenterS.A.onourbehalfshallhavethe sameeffectasactsofourown. Name:kimiouyangDate:2026.7.28 Title:manager Signatureofapplicant:

00012160_X9_Ed.3 1/1 ShenzhenDaxiongIntelligenceCo.,Ltd. ModularTransmitterApprovalRequest FederalCommunicationsCommission EquipmentAuthorizationBranch 7435OaklandMillsRoad Columbia,MD21046 Companyname:ShenzhenDaxiongIntelligenceCo.,Ltd. FCCID:2BW48-D73 Gentlemen, Inaccordancewith47CFR15.212ModularTransmittersandKDB996369D01‘Module CertificationGuidev04’.FCCID2BW48-D73hasbeenexaminedagainstthefollowing requirements. ItemstobecoveredbySinglemodulartransmitters. Requirementper15.212andKDB996369 D01‘ModularCertificationGuidev04 Y/NComments/Explanationfrom Grantee (Explainwhyproductcomplies/howitis achieved) 1.Theradioelementsmusthavetheradio frequencycircuitryshielded.Physical componentsandtuningcapacitor(s)maybe locatedexternaltotheshield,butmustbeon themoduleassembly YesThenRF52840SoCintegratesinternal built-inRFshieldingforallradio transceivercircuitry.AllcriticalRF circuits,matchingcomponentsand tuningcomponentsareplacedonthe D73-nRF52840C08modulePCB assembly,meetingtheshielding requirementformodulartransmitter. 2.Themodulemusthavebuffered modulation/datainputstoensurethatthe devicewillcomplywithPart15requirements withanytypeofinputsignal YesAllmodulationandRFtransmission parametersarefullycontrolledand lockedinsidenRF52840firmware. Externalhostdatainterfacesare buffered.Hostinputsignalscannot modifytransmitpower,modulation formatorRFoperatingparameters, ensuringcontinuouscompliancewith FCCPart15underallvalidinput conditions. 3.Themodulemustcontainpowersupply regulationonthemodule YesPowersupplyregulationis implemented viatheinternalvoltageregulators integratedwithinthenRF52840SoCon theD73-nRF52840C08module.The modulesupportssupplyviaVDD(3.3V) orVDDH(upto5V).Thebuilt-in regulatorsstabilizepowerfortheRF transceiver,maintainingconsistentRF operatingconditionsregardlessof minorfluctuationsintheinputsupply voltagesuppliedbythehost. 4.Themodulemustcontainapermanently attachedantenna,orcontainaunique antennaconnector,andbemarketedand operatedonlywithspecificantenna(s),per Sections15.203,15.204(b),15.204(c), 15.212(a),2.929(b) YesTheD73-nRF52840C08moduleis equippedwithpermanentlyattached ceramicantenna,noexternalantenna connectorisavailable.Themodule shallonlybemarketedandoperated withthisintegratedceramicantennaas designed,complyingwith § 15.203, § 00012160_X9_Ed.3 1/1 15.204(b), § 15.204(c), § 15.212(a)and § 2.929(b). 5.Themodulemustdemonstratecompliancein astand-aloneconfiguration YesAllRFcompliancetestingofD73- nRF52840C08modulewascompleted understandaloneoperating configuration.Themodulecanwork independentlywithoutrelyingonany externalhostcircuitry.Allsubmittedtest dataareobtainedfromstandalone moduletesting. 6.Themodulemustbelabelledwithits permanentlyaffixedFCCIDlabel,orusean electronicdisplay(SeeKDBPublication 784748aboutlabellingrequirements) YesApermanentlyaffixedphysicalFCCID labelwillbeplacedonthesurfaceof D73-nRF52840C08modulehardware. Labellayout,textandformatfullymeet labellingrequirementsspecifiedinKDB Publication784748. 7.Themodulemustcomplywithallspecific rulesapplicabletothetransmitterincluding alltheconditionsprovidedintheintegration instructionsbythegrantee YesTheD73-nRF52840C08module complieswithallapplicablerulesunder FCCPart15SubpartCfor2.4GHz intentionalradiators.Completemodule integrationinstructionsaresuppliedto hostmanufacturers,listingalloperating constraintstomaintaincompliance. Hostintegratorsmuststrictlyfollowthe integrationguide. 8.ThemodulemustcomplywithRFexposure requirements YesRFexposureMPEevaluationhasbeen completedforD73-nRF52840C08 moduleaccordingtoFCC requirements.Theevaluationproves themodulemeetsRFexposurelimits. Minimumseparationdistance requirementsbetweenantennaand humanbodyaredocumentedwithinthe integrationmanualforhostintegrators. 00012160_X9_Ed.3 1/1 ItemstobecoveredbySplitmodulartransmitters. Alimitedmodularapproval(LMA)maybegrantedforsingleorsplitmodular transmittersthatcomplypartiallywithrequirementsabove. Name:Date:2026.08.11 Title: Signatureofapplicant Requirementper15.212andKDB 996369D01 ‘ModularCertificationGuidev04 Y/NComments/Explanationfrom Grantee (Explainwhyproductcomplies/howitis achieved) 9.Splitmodulartransmittersmustmeet alltherequirementsofasingle modularinaboveitem1and5for singlemodularapproval requirements. N/A 10.Onlytheradiofrontendmustbe shielded.Thephysicalcrystaland tuningcapacitorsmaybelocated externaltotheshieldedradio elements.Theinterfacebetweenthe splitsectionsofthemodularsystem mustbedigitalwithaminimum signalingamplitudeof150mVpeak- to-peak. N/A 11.Controlinformationandotherdata maybeexchangedbetweenthe transmittercontrolelementsandradio frontend. N/A 12.Thesectionsofasplitmodular transmittermustbetestedinstalledin ahostdevice(s)similartothatwhich isrepresentativeoftheplatform(s) intendedforuse. N/A 13.Manufacturersmustensurethatonly transmittercontrolelementsandradio frontendcomponentsthathavebeen approvedtogetherarecapableof operatingtogether.Thetransmitter modulemustnotoperateunlessithas verifiedthattheinstalledtransmitter controlelementsandradiofrontend havebeenauthorizedtogether. Manufacturersmayusemeans including,butnotlimitedto,codingin hardwareandelectronicsignaturesin softwaretomeettheserequirements, andmustdescribethemethodsin theirapplicationforequipment authorization. N/A

EUTPHOTO(ExternalPhotos) TestModel:D73-nRF52840C08 ※※※※※ENDOFREPORT※※※※※

Labelandlabellocation FCCIDLABEL: High:0.1cm Wide:1cm LabelLocation: FCCID:2BW48-D73

EUTPHOTO(InternalPhotos) TestModel:D73-nRF52840C08 ※※※※※ENDOFREPORT※※※※※ ANT

FCCID:2BW48-D73 RFEXPOSUREEVALUATION Limits AccordingKDB447498D01GeneralRFExposureGuidancev06. TheRFexposureevaluationrequirementsof§2.1091formobiledeviceexposureconditionssubjecttoMPE limits:RequirementsofthissectionareaconsequenceofCommissionresponsibilitiesundertheNational EnvironmentalPolicyActtoevaluatetheenvironmentalsignificanceofitsactions.SeesubpartIofpart1of thischapter,inparticular§1.1307(b). Forpurposesofthissection,thedefinitionsin§1.1307(b)(2)ofthischaptershallapply.Amobiledeviceis definedasatransmittingdevicedesignedtobeusedinotherthanfixedlocationsandtogenerallybeusedin suchawaythataseparationdistanceofatleast20centimetersisnormallymaintainedbetweentheRF source'sradiatingstructure(s)andthebodyoftheuserornearbypersons.Inthiscontext,theterm“fixed location”meansthatthedeviceisphysicallysecuredatonelocationandisnotabletobeeasilymovedto anotherlocationwhiletransmitting.Transmittingdevicesdesignedtobeusedbyconsumersorworkersthat canbeeasilyre-located,suchaswirelessdevicesassociatedwithapersonaldesktopcomputer,are consideredtobemobiledevicesiftheymeetthe20-centimeterseparationrequirement. Thecriterialistedinthefollowingtableshallbeusedtoevaluatetheenvironmentimpactofhumanexposure toradiofrequency(RF)radiationasspecifiedin1.1307(b). LimitsforMaximumPermissibleExposure(MPE) Frequencyrange (MHz) Electricfield strength (V/m) Magneticfieldstrength (A/m) Powerdensity (mW/cm 2 ) Averagingtime (minutes) (A)LimitsforOccupational/ControlledExposures 0.3–3.06141.63*(100)6 3.0–301842/f4.89/f*(900/f 2 )6 30–30061.40.1631.06 300–1500f/3006 1500–100,00056 (B)LimitsforGeneralPopulation/UncontrolledExposure 0.3–1.346141.63*(100)30 1.34–30824/f2.19/f*(180/f 2 )30 30–30027.50.0730.230 300–1500f/150030 1500–100,0001.030 f=frequencyinMHz Friistransmissionformula:Pd=(Pout*G)/(4*pi*r 2 ) Where Pd=powerdensityinmW/cm 2 ,Pout=outputpowertoantennainmW; G=gainofantennainlinearscale,Pi=3.1416; R=distancebetweenobservationpointandcenteroftheradiatorincm PdidthelimitofMPE,1mW/cm 2 .Ifweknowthemaximumgainoftheantennaandthetotalpowerinputto theantenna,throughthecalculation,wewillknowthedistancerwheretheMPElimitisreached. TestProcedure SoftwareprovidedbyclientenabledtheEUTtotransmitandreceivedataatlowest,middleandhighest channelindividually. TestResultofRFExposureEvaluation BLE Mode Frequency Output power Tune-up power Maxtune-up power Maxtune-up power Power Densityat R=20cm Limit Result (MHz)(dBm)(dBm)(dBm)(mW)(mW/cm 2 )(mW/cm 2 ) GFSK2480 -1.008-1±101.000.000397 1.0PASS Note:AntennaGain=3dBi

ReportNo.:ZKT-2607090500E Page1of41 FCCTESTREPORT FCCID:2BW48-D73 ReportNumber.....................................: ZKT-2607090500E DateofTest ....................................................... :Jul.09,2026toJul.23,2026 Dateofissue.........................................:Jul.23,2026 Totalnumberofpages .......................... 41 TestResult .......................................... : PASS TestingLaboratory............................: ShenzhenZKTTechnologyCo.,Ltd. Address ............................................... : 1/F,No.101,BuildingB,No.6,TangweiCommunityIndustrialAvenue, FuhaiStreet,Bao'anDistrict,Shenzhen,China Applicant'sname ............................. : ShenzhenDaxiongIntelligenceCo.,Ltd. Address ............................................... : Room806-808,TangdongOptoelectronicsR&DBuilding,Bao'an, Shenzhen,Guangdong,China Manufacturer'sname ...................... : ShenzhenDaxiongIntelligenceCo.,Ltd. Address ............................................... : Room806-808,TangdongOptoelectronicsR&DBuilding,Bao'an, Shenzhen,Guangdong,China Testspecification: Standard ................................................ : FCCCFRTitle47Part15SubpartCSection15.247 ANSIC63.10-2020+Cor.1-2023+C63.10a-2024+Erratato C63.10a-2024 Testprocedure.....................................: / Non-standardtestmethod................:N/A TestReportFormNo. ....................... : TRF-EL-111_V0 TestReportForm(s)Originator ..... : ZKTTesting MasterTRF........................................: Dated:2020-01-06 ThisdevicedescribedabovehasbeentestedbyZKT,andthetestresultsshowthattheequipmentundertest (EUT)isincompliancewiththeFCCrequirements.Anditisapplicableonlytothetestedsampleidentifiedin thereport. Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofZKT,thisdocumentmaybe alteredorrevisedbyZKT,personalonly,andshallbenotedintherevisionofthedocument. Productname.....................................:BluetoothRFModule Trademark...........................................:N/A ReportNo.:ZKT-2607090500E Page2of41 Model/Typereference.........................: D73-nRF52840C08 D73-nRF52840C08-AT,D73-nRF52840C08-AT101, D73-nRF52840C08-AT102,D73-nRF52840C08-AT103, D73-nRF52840C08-AT104,D73-nRF52840C08-AT105, D73-nRF52840C08-AT106,D73-nRF52840C08-AT107, D73-nRF52840C08-AT108,D73-nRF52840C08-AT109, D73-nRF52840C08-AT110,D73-nRF52840C08-AT111, D73-nRF52840C08-AT112,D73-nRF52840C08-AT113, D73-nRF52840C08-AT114,D73-nRF52840C08-AT115, D73-nRF52840C08-AT116,D73-nRF52840C08-AT117 Ratings..................................................:Input:3.3V15mA ReportNo.:ZKT-2607090500E Page3of41 Testingprocedureandtestinglocation: TestingLaboratory.......................................: ShenzhenZKTTechnologyCo.,Ltd. Address............................................................:1/F,No.101,BuildingB,No.6,TangweiCommunity IndustrialAvenue,FuhaiStreet,Bao'anDistrict, Shenzhen,China JimLiu Testedby(name+signature).......................: JacksonFang Reviewer(name+signature).......................: LakeXie Approved(name+signature) ....................... : ReportNo.:ZKT-2607090500E Page4of41 TableofContentsPage 1.VERSION.......................................................................................................................6 2.SUMMARYOFTESTRESULTS...................................................................................7 2.1TESTFACILITY..........................................................................................................................8 2.2MEASUREMENTUNCERTAINTY.............................................................................................8 3.GENER…

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