2BUYY-T1Ring counter

FCC Caution 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. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -- Reorient or relocate the receiving antenna. -- Increase the separation between the equipment and receiver. -- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -- Consult the dealer or an experienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. Ring counter T1

LocalRepresentativeLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(7),oftheCommission’sRules(47C.F.R.)weattestasfollowsfor theproductlistedbelow: FCCIDModelname 2BUYY-T1T1 Weherebyacknowledgeasfollows: i.bothsigneesconfirmthatthepointofcontactacceptsresponsibilitytoactasaUS- AmericanRepresentativeonbehalfoftheapplicant ii.thepointofcontactprovidesthephysicalU.S.addressandemailaslistedbelow iii.bothpartiesmaintaintherequirementsofthisagreementwithoutexpirationdate US-AmericanPointofContactApplicant/ApprovalHolder SignatureSignature CompanyName:LOBOSIOWAINCYingDuTechnologyCo.,Ltd., Dongguan,GuangdongProvince FRN:00364139610038090932 ContactName:HarleyLiLuwenTang Address:4623BittercreekDrColorado SpringsCO80922US Room202,Building2,No.5, Xin'anMeiyuanRoad,Chang'an Town,DongguanCity, GuangdongProvince Phone:+18188180538N/A Email:[email protected]@139.com

CoveredEquipmentAttestationLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(5)(i)-(ii)oftheCommission’sRules(47C.F.R.)weattestas followsfortheproductlistedbelow: FCCIDModelname 2BUYY-T1T1 We, Applicant CompanyName:YingDuTechnologyCo.,Ltd.,Dongguan, GuangdongProvince Address:Room202,Building2,No.5,Xin'an MeiyuanRoad,Chang'anTown,Dongguan City,GuangdongProvince Phone:N/A certifythattheequipmentforwhichauthorizationissoughtisnot“covered”equipment prohibitedfromreceivinganequipmentauthorizationpursuanttosection2.903oftheFCC rules.Thisincludesthecybersecurityandanti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofistsuccessorsandassignees. Wecertifythat,asofthedateofthefilingoftheapplication,theapplicantisnotidentified ontheCoveredListasanentityproducing“covered”equipment. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-3-20 SignatureDate PrintedNameofSignee:LuwenTang Company:YingDuTechnologyCo.,Ltd., Dongguan,GuangdongProvince Phone:19006615519 Email:[email protected] Address:Room202,Building2,No.5,Xin'an MeiyuanRoad,Chang'anTown,Dongguan City,GuangdongProvince Fax:N/A

ConfidentialityRequestLetter ForCertificationServiceintheUSA FederalCommunicationCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoParagraphs§0.457and0.459oftheCommission’sRules(47C.F.R.)andSection §552(b)(4)oftheFreedomofInformationAct,werequestconfidentialityforthe documentationofthefollowingproducts: FCCIDModelname 2BUYY-T1T1 Fortheproductslistedabove,werequestpermanentconfidentialityforallapplicable exhibitsasthereare:  theOperationalDescription  theBlockDiagram theSchematics Theabovelistedexhibitscontaintradesecretsandproprietaryinformationthatcouldbeof benefittoourcompetitors. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-3-20 SignatureDate PrintedNameofSignee/Title:LuwenTang/Manager Company:YingDuTechnologyCo.,Ltd.,Dongguan,Guangdong Province Address:Room202,Building2,No.5,Xin'anMeiyuanRoad, Chang'anTown,DongguanCity,GuangdongProvince Phone:19006615519 Fax:-- Email:[email protected]

ReportNo.:CISRR26022408401 Page 43 of 47 9.EXTERNALANDINTERNALPHOTOS 9.1.ExternalPhotos ReportNo.:CISRR26022408401 Page 44 of 47 ReportNo.:CISRR26022408401 Page 45 of 47

Label Size:10mm*4mm FCCID:2BUYY-T1 LabelLocation

ReportNo.:CISRR26022408401 Page 46 of 47 9.2.InternalPhotos ReportNo.:CISRR26022408401 Page 47 of 47 ------Endofthereport----- ANT

ReportNo.: CISRR26022408402 Reporttemplateversion:CISE-TR-001-A0Page:1of6 TESTREPORT RFExposureEvaluation ReportNo.: CISRR26022408402 ProjectNo.: CISR260224084 FCCID:2BUYY-T1 Applicant:YingDuTechnologyCo.,Ltd.,Dongguan,GuangdongProvince Address: Room202,Building2,No.5,Xin'anMeiyuanRoad,Chang'anTown, DongguanCity,GuangdongProvince Manufacturer: YingDuTechnologyCo.,Ltd.,Dongguan,GuangdongProvince Address: Room202,Building2,No.5,Xin'anMeiyuanRoad,Chang'anTown, DongguanCity,GuangdongProvince ProductName: Ringcounter TradeMark:- Model/Typereference:T1 ListedModel(s):- Standard:47CFRPart2.1093 Issuedate:March2,2026 Testresult:Complied Reviewedby:MorganTan Approvedby:HansHu Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangceTesting TechnologyCo.,Ltd. ReportNo.: CISRR26022408402 Reporttemplateversion:CISE-TR-001-A0Page:2of6 Contents 1.APPLICABLESTANDARD..............................................................................................................................3 2.REPORTVERSION..........................................................................................................................................3 3.RADIOSPECIFICATIONDESCRIPTION........................................................................................................4 4.SIMULTANEOUSTRANSMISSIONANALYSIS.............................................................................................4 5.TESTRESULT.................................................................................................................................................5 5.1.STANDALONETRANSMISSION.................................................................................................................5 5.2.SIMULTANEOUSTRANSMISSION.............................................................................................................6 ReportNo.: CISRR26022408402 Reporttemplateversion:CISE-TR-001-A0Page:3of6 1.APPLICABLESTANDARD 47CFRPart2.1093:Radiofrequencyradiationexposureevaluation:portabledevices ANSIC95.1–2019:IEEEStandardforSafetyLevelswithRespecttoHumanExposuretoRadioFrequency ElectromagneticFields,3kHzto300GHz. FCCKDBpublication447498D01GeneralRFExposureGuidancev06:MobileandPortableDevicesRF ExposureProceduresandEquipmentAuthorizationPolicies. 47CFRPart1.1307:Actionsthatmayhaveasignificantenvironmentaleffect,forwhichEnvironmental Assessments(EAs)mustbeprepared. 2.REPORTVERSION VersionNo.IssuedateDescription 00March2,2026Original ReportNo.: CISRR26022408402 Reporttemplateversion:CISE-TR-001-A0Page:4of6 3.RADIOSPECIFICATIONDESCRIPTION Bluetooth Supportedtype:BREDRLE-1Mbps LE-2Mbps Note:PleaserefertoRFreportfordetailedtechnicalspecifications 4.SIMULTANEOUSTRANSMISSIONANALYSIS ThesedevicesuseasingletransmittermoduleandantennaforbothBT,BTcannottransmitsimultaneously. ReportNo.: CISRR26022408402 Reporttemplateversion:CISE-TR-001-A0Page:5of6 5.TESTRESULT 5.1.Standalonetransmission Limit: KDB447498D01v06,Clause4.3.1a) For100MHzto6GHzandtestseparationdistances≤50mm,the1-gand10-g SARtestexclusionthresholdsaredeterminedbythefollowing: [(max.powerofchannel,includingtune-uptolerance,mW)/(min.testseparation distance,mm)]*[√f(GHz)]≤3.0for1-gSAR,and≤7.5for10-gextremitySAR,where f(GHz)istheRFchanneltransmitfrequencyinGHz PoweranddistanceareroundedtothenearestmWandmmbeforecalculation31The resultisroundedtoonedecimalplaceforcomparison Thevalues3.0and7.5arereferredtoasnumericthresholdsinstepb)below Thetestexclusionsareapplicableonlywhentheminimumtestseparationdistanceis≤50mm, andfortransmissionfrequenciesbetween100MHzand6GHz.Whentheminimumtest separationdistanceis<5mm,adistanceof5mmaccordingto4.1f)isappliedtodetermine SARtestexclusion. Result: Passed TestData Radiotype Frequency (GHz) Maximum output power #1 (dBm) Antenna gain #2 (dBi) Maximum EIRP #3 (dBm) Maximum tune-up EIRP #4 (dBm) Minimum distance (mm) Evaluated value LimitResult Bluetooth2.4021.101.752.853.005.000.61853.00PASS Note #1:ThisvaluecomesfromtheRFtestreport. #2:Thisvalueisdeclaredbytheapplicant. #3:EIRP=Maximumoutputpower+Antennagain. #4:Thisvalueisdeclaredbytheapplicant. ReportNo.: CISRR26022408402 Reporttemplateversion:CISE-TR-001-A0Page:6of6 5.2.Simultaneoustransmission Limit: KDB447498D01v06,Clause4.3.2,47CFRPart1.1307 InthecaseofxedRFsourcesoperatinginthesametime-averagingperiod,orof multiplemobileorportableRFsourceswithinadeviceoperatinginthesametime averagingperiod,ifthesumofthefractionalcontributionstotheapplicablethresholds islessthanorequalto1asindicatedinthefollowingequation. Where a=numberoffxed,mobile,orportableRFsourcesclaimingexemptionusingparagraph (b)(3)(i)(B)ofthissectionforP,includingexistingexempttransmittersandthosebeing added. b=numberoffxed,mobile,orportableRFsourcesclaimingexemptionusingparagraph (b)(3)(i)(C)ofthissectionforThresholdERP,includingexistingexempttransmittersand thosebeingadded. c=numberofexistingfixed,mobile,orportableRFsourceswithknownevaluationforthespeci edminimumdistanceincludingexistingevaluatedtransmitters. P j =theavailablemaximumtime-averagedpowerortheERP,whicheverisgreater,forxed, mobile,orportableRFsourceiatadistancebetween0.5cmand40cm(inclusive). P th,j =theexemptionthresholdpower(P)accordingtoparagraph(b)(3)(i)(B)ofthissectionfor xed,mobile,orportableRFsourcei. ERP j =theERPoffixed,mobile,orportableRFsourcej. ERP th,j =exemptionthresholdERPforfixed,mobile,orportableRFsourcej,atadistanceofat leastλ/2πaccordingtotheapplicableformulaofparagraph(b)(3)(i)(C)ofthissection. Evaluated k =themaximumreportedSARorMPEoffixed,mobile,orportableRFsourcekeither inthedeviceoratthetransmittersitefromanexistingevaluationatthelocationofexposure. ExposureLimit k =eitherthegeneralpopulation/uncontrolledmaximumpermissibleexposure (MPE)orspecicabsorptionrate(SAR)limitforeachxed,mobile,orportableRFsourcek, asapplicablefrom§1.1310ofthischapter. Result:NotApplicable --------EndofReport--------

1. Antenna Data Sheet Technical indicators of products Frequency Range(MHz) 2400-2500 Band Width(MHz) 100 Impedance(Ω) 50 VSWR 1.91 MAX Return Loss（dB） -15.3 Peak Gain(dBi) 1.75 PolarizatioLinear Vertical Antenna Material PCB Operating Temp (°C) —20～65 Storage Temp (°C ) —30～75 BT_NANO_Antenna modelANTENNA 2. Product picture Manufacturer: Dongguan September Tian Electronic Technology Co., Ltd. Address: 704A, Building 2, Xinghui Zhidi Plaza, Changping Town, Dongguan City BT Compact Meandered On-board Antenna Antenna Name 3. Return Loss 4. VSWR 5、TESTDATA: 2400431.6 2450501.75 2500481.68 6. 3Dgainpattern 7.E,hplan

ReportNo.:CISRR26022408401 Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangce TestingTechnologyCo.,Ltd. Page1of40 TESTREPORT ReportNo.CISRR26022408401 ProjectNo.CISR260224084 FCCID2BUYY-T1 ApplicantYingDuTechnologyCo.,Ltd.,Dongguan,GuangdongProvince Address Room202,Building2,No.5,Xin'anMeiyuanRoad,Chang'anTown, DongguanCity,GuangdongProvince ManufacturerYingDuTechnologyCo.,Ltd.,Dongguan,GuangdongProvince Address Room202,Building2,No.5,Xin'anMeiyuanRoad,Chang'anTown, DongguanCity,GuangdongProvince ProductNameRingcounter Trademark- Model/TypereferenceT1 ListedModel(s)- Standard 47CFRPart15.247 DateofsamplereceiptFebruary27,2026 TestdateFebruary27,2026toMarch3,2026 IssuedateMarch2,2026 TestresultComplied Reviewedby:MorganTan Approvedby:HansHu ReportNo.:CISRR26022408401 Page 2 of 40 Contents 1.STANDARDANDAPPLICABLETESTMETHODS........................................................................................3 2.REPORTVERSION..........................................................................................................................................3 3.TESTDESCRIPTION.......................................................................................................................................4 4.SUMMARY........................................................................................................................................................5 4.1.ProductDescription*..................................................................................................................................5 4.2.RadioSpecificationDescription*..............................................................................................................5 4.3.ModificationofEUT.....................................................................................................................................6 4.4.Deviationfromstandards...........................................................................................................................6 4.5.TestingSite...................................................................................................................................................6 5.TESTCONFIGURATION.................................................................................................................................7 5.1.Testfrequencylist.......................................................................................................................................7 5.2.Descriptionsoftestmode...........................................................................................................................7 5.3.Supportunitusedintestconfiguration....................................................................................................7 5.4.Testsampleinformation.............................................................................................................................7 5.5.Environmentalconditions...........................................................................................................................7 5.6.Statementofthemeasurementuncertainty.............................................................................................7 5.7.EquipmentUsedduringtheTest................................................................................................................8 6.TESTRESULTS.............................................................................................................................................10 6.1.EvaluationResults(Evaluation)...............................................................................................................10 6.1.1.AntennaRequirement............................................................................................................................10 6.2.RadioSpectrumMatterTestResults(RF)...............................................................................................11 6.2.1.6dBBandwidth........................................................................................................................................11 6.2.2.MaximumConductedOutputPower.....................................................................................................12 6.2.3.PowerSpectralDensity..........................................................................................................................13 6.2.4.Conductedbandedgeandspuriousemission...................................................................................14 6.2.5.Radiatedbandedgeemission...............................................................................................................15 6.2.6.RadiatedSpuriousEmission(below1GHz).........................................................................................21 6.2.7.RadiatedSpuriousEmission(Above1GHz)........................................................................................25 7.APPENDIXREPORT......................................................................................................................................33 7.1.ConductedOutputPower.........................................................................................................................33 7.2.6dBBandwidth...........................................................................................................................................35 7.3.PowerSpectralDensity.............................................................................................................................36 7.4.DutyCycle..................................................................................................................................................37 7.5.ConductedSpurious&BandEdgeEmission.........................................................................................38 ReportNo.:CISRR26022408401 Page 3 of 40 1.STANDARDANDAPPLICABLETESTMETHODS Thetestswereperform…

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ReportNo.:CISRR26022408401 Page 42 of 47 8.TESTSETUPPHOTOS Radiatedbandedgeemission RadiatedSpuriousEmission(Above1GHz) RadiatedSpuriousEmission(below1GHz)