2BFL4-JYD-C20Helmet Bluetooth Headset

1: First-time pairing: After switching on both units, press the“ ” key twice on each to enter intercom mode. The LED changes to a slow green flash. On one unit, press“ ” twice again to set it to receive mode (a tone sounds). When one unit is in transmit mode, the two units will link; the green LED turns solid and a connection tone plays. You can now talk via intercom. Press and hold the power button“ ” for 2–3 seconds to turn the headset on. The LED flashes red and blue alternately. To turn it off, press and hold the same button for 2–3 seconds; you’ll hear a tone and the LED will switch off. 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.

CoveredEquipmentAttestationLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(5)(i)-(ii)oftheCommission’sRules(47C.F.R.)weattestas followsfortheproductlistedbelow: FCCIDModelname 2BFL4-JYD-C20JYD-C20 We, Applicant CompanyName:ShenzhenJiayoudaElectronicsCo.,Ltd Address:711,BuildingC,LangkouBaokeIndustrial Zone,LonghuaDistrict,Shenzhen City,China Phone:N/A certifythattheequipmentforwhichauthorizationissoughtisnot“covered”equipment prohibitedfromreceivinganequipmentauthorizationpursuanttosection2.903oftheFCC rules.Thisincludesthecybersecurityandanti-virussoftwareproducedorprovidedby KasperskyLab,Inc.oranyofistsuccessorsandassignees. Wecertifythat,asofthedateofthefilingoftheapplication,theapplicantisnotidentified ontheCoveredListasanentityproducing“covered”equipment. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-1-13 SignatureDate PrintedNameofSignee:JinpingHe Company:ShenzhenJiayoudaElectronics Co.,Ltd Phone:15297841020 Email:[email protected] Address:711,BuildingC,LangkouBaoke IndustrialZone,LonghuaDistrict,Shenzhen City,China 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 2BFL4-JYD-C20JYD-C20 Fortheproductslistedabove,werequestpermanentconfidentialityforallapplicable exhibitsasthereare:  theOperationalDescription  theBlockDiagram theSchematics Theabovelistedexhibitscontaintradesecretsandproprietaryinformationthatcouldbeof benefittoourcompetitors. Ifyouhaveanyquestions,pleasefeelfreetocontactusattheaddressshownbelow. Sincerely, 2026-1-13 SignatureDate PrintedNameofSignee/Title:JinpingHe/Manager Company:ShenzhenJiayoudaElectronicsCo.,Ltd Address:711,BuildingC,LangkouBaokeIndustrialZone,Longhua District,ShenzhenCity,China Phone:15297841020 Fax:-- Email:[email protected]

ReportNo.:CISRR25121732201 Page 50 of 53 9.EXTERNALANDINTERNALPHOTOS 9.1.ExternalPhotos ReportNo.:CISRR25121732201 Page 51 of 53

Label Size:20mm*16mm ModelName:JYD-C20 FCCID:2BFL4-JYD-C20 LabelLocation

ReportNo.:CISRR25121732201 Page 52 of 53 9.2.InternalPhotos ReportNo.:CISRR25121732201 Page 53 of 53 ------Endofthereport----- ANT

ReportNo.: CISRR25121732203 Reporttemplateversion:CISE-TR-001-A0Page:1of5 TESTREPORT RFExposureEvaluation ReportNo.: CISRR25121732203 ProjectNo.: CISR251217322 FCCID:2BFL4-JYD-C20 Applicant:ShenzhenJiayoudaElectronicsCo.,Ltd Address: 711,BuildingC,LangkouBaokeIndustrialZone,Longhua District,Shenzhen City,China Manufacturer: ShenzhenJiayoudaElectronicsCo.,Ltd Address: 711,BuildingC,LangkouBaokeIndustrialZone,Longhua District,Shenzhen City,China ProductName: HelmetBluetoothHeadset TradeMark: - Model/Typereference: JYD-C20 ListedModel(s):- Standard:47CFRPart2.1093 Issuedate:December23,2025 Testresult:Complied Reviewedby:MorganTan Approvedby:HansHu Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangceTesting TechnologyCo.,Ltd. ReportNo.: CISRR25121732203 Reporttemplateversion:CISE-TR-001-A0Page:2of5 1.APPLICABLESTANDARD 47CFRPart2.1093:Radiofrequencyradiationexposureevaluation:portabledevices ANSIC95.1–3999:IEEEStandardforSafetyLevelswithRespecttoHumanExposuretoRadioFrequency ElectromagneticFields,3kHzto300GHz. FCCKDBpublication447498D01GeneralRFExposureGuidancev06:MobileandPortableDevicesRF ExposureProceduresandEquipmentAuthorizationPolicies. 47CFRPart1.1307:Actionsthatmayhaveasignificantenvironmentaleffect,forwhichEnvironmental Assessments(EAs)mustbeprepared. 2.REPORTVERSION VersionNo.IssuedateDescription 00December23,2025Original ReportNo.: CISRR25121732203 Reporttemplateversion:CISE-TR-001-A0Page:3of5 3.RADIOSPECIFICATIONDESCRIPTION Bluetooth Supportedtype:BREDRLE-1Mbps LE-2Mbps Note:PleaserefertoRFreportfordetailedtechnicalspecifications 4.SIMULTANEOUSTRANSMISSIONANALYSIS ThesedevicesuseasingletransmittermoduleandantennaforbothBT,BTcannottransmitsimultaneously. ReportNo.: CISRR25121732203 Reporttemplateversion:CISE-TR-001-A0Page:4of5 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 Bluetooth-BR2.4022.222.54.725.005.000.98023.00PASS Bluetooth-LE2.4022.212.54.715.005.000.98023.00PASS Note #1:ThisvaluecomesfromtheRFtestreport. #2:Thisvalueisdeclaredbytheapplicant. #3:EIRP=Maximumoutputpower+Antennagain. #4:Thisvalueisdeclaredbytheapplicant. ReportNo.: CISRR25121732203 Reporttemplateversion:CISE-TR-001-A0Page:5of5 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--------

深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 1 OF 12 3.2X1.6X1.0 (mm) WiFi/Bluetooth Ceramic Chip Antenna Engineering Specification 1. Product Number (1)Product Type Chip Antenna (2)Size Code 3.2x1.6x1.0mm (3)Type Code H3 (4)Packing Plastic Packaging (5)Frequency 2.45GHz 5 4 3 2 1 2G45 X H3 3216 YF Address:Room 412, Building 7, Phase II, Nanshan Cloud Valley Pioneer Park, No. 2 Pingshan 1st Road, Pingshan Community, Taoyuan Sub-district, Nanshan District, Shenzhen City, Guangdong Province,China 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 2 OF 12 2. Features *Stable and reliable in performances *Low temperature coefficient of frequency *Low profile, compact size *RoHS compliance *SMT processes compatible 3. Applications *Bluetooth earphone systems *Hand-held devices when WiFi /Bluetooth functions are needed, e.g., Smart phone. *IEEE802.11 b/g/n *ZigBee *Wireless PCMCIA cards or USB dongle 4. Description Yingfeng chip antenna series are specially designed for WiFi/Bluetooth applications. Based on yingfeng proprietary design and processes, this chip antenna has excellent stability and sensitivity to consistently provide high signal reception efficiency. 5. Electrical Specifications (80 x 40 mm 2 ground plane) 5-1. Electrical Table Characteristics Specifications Unit Outline Dimensions 3.2x1.6x1.0 mm Working Frequency 2400~2500 MHz VSWR 2 Max. Impedance 50  Polarization Linear Polarization Gain Peak 2.5(typical)dBi Efficiency 80(typical)% 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 3 OF 12 5-2. Return Loss & VSWR Return Loss (S 11 ) VSWR(S 11 ) 6. Antenna Dimensions & Test Board (unit: mm) a. Antenna Dimensions b. Test Board with Antenna 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 4 OF 12 80 40 Unit: mm 7. Radiation Pattern (80 x 40 mm 2 ground plane) 7-1. 3D Gain Pattern @ 2442 MHz Z X Y 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 5 OF 12 7-2. 3D Efficiency Table Frequency( MHz) 2400 2410 2420 2430 2442 2450 2460 2470 2480 2490 2500 Efficiency (dB) -1.4 -1.0 -0.9 -0.7 -0.7 -0.8 -0.9 -1.1 -1.2 -1.3 -1.4 Efficiency (%) 72.8 73.7 74.3 74.4 75.5 75.0 74.0 73.6 73.1 72.6 71.5 Gain (dBi) 2.1 2.2 2.3 2.4 2.5 2.5 2.4 1.8 1.7 1.6 1.4 Y X Z Y X X Y Z 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 6 OF 12 7-3. 3D Efficiency vs. Frequency 8. Layout Guide a. Solder Land Pattern: Land pattern for soldering (gray marking areas) is as shown below. Depending on Customer’s requirement, matching circuit as shown below is also recommended. Efficiency vs. Frequency 50 60 70 80 90 100 24002410242024302442245024602470248024902500 Frequency(MHz) Efficiency(%) 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 7 OF 12 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 8 OF 12 9. Frequency tuning a. Chip antenna tuning scenario： b. Matching circuit：(Center frequency is about 2442 MHz @ 80 x 40 mm 2 ground plane) System Matching Circuit Component Location Description Vendor Toleranc e 1 1.2 pF* Murata (0402) ±0.1 pF 2 10PF* Murata(0402) ±0.5 PF 3 N/A* - - Fine tuning element 4 1.5 pF* Murata (0402) ±0.1 pF *Typical reference values which may need to be changed when circuit boards or part vendors are different. Matching circuit Feed 4. Fine tuning elemet 1 2 3 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 9 OF 12 c. Fine tuning element vs. Center frequency 10. Soldering Conditions a. Typical Soldering Profile for Lead-free Process Time 60-180s 60-150s 20- Pre- 150-200° 217°C 260° Temperature (°C) 深圳市迎丰天线技术有限公司 SHEN ZHEN YINGFENG ANTENNA TECHNOLOYCO.,LTD Prepared by : JIEXI Designed by : Jason Checked by : Jason Approved by：MR.FANG TITLE：3.2 x 1.6 x 1.0(mm) WiFi/Bluetooth Ceramic Chip Antenna (YF3216H3) Engineering Specification DOCUMENT YF3216H3X2G45 REV. NO. D PAGE 10 OF 12 11. Packing (1) Quantity/Reel: 3000 pcs/Reel: Packaging Information  Tape Specification: W Ao Bo Ko P F E D D1 Po P2 t 8.0 ±0.30 1.80 ±0.05 3.51 ±0.10 1.59 ±0.10 4.00 ±0.05 3.50 ±0.05 1.75 ±0.10 1.50 ±0.10 0.00 ±0.10 4.00 ±0.1…

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ReportNo.:CISRR25121732201 Thetestresultsrelateonlytothetestedsamples. ThetestreportshouldnotbereproducedexceptinfullwithoutthewrittenapprovalofShenzhenBangce TestingTechnologyCo.,Ltd. Page1of46 TESTREPORT ReportNo.CISRR25121732201 ProjectNo.CISR251217322 FCCID2BFL4-JYD-C20 ApplicantShenzhenJiayoudaElectronicsCo.,Ltd Address 711,BuildingC,LangkouBaokeIndustrialZone,Longhua District,Shenzhen City,China ManufacturerShenzhenJiayoudaElectronicsCo.,Ltd Address 711,BuildingC,LangkouBaokeIndustrialZone,Longhua District,Shenzhen City,China ProductNameHelmetBluetoothHeadset Trademark- Model/TypereferenceJYD-C20 ListedModel(s)- Standard 47CFRPart15.247 DateofsamplereceiptDecember19,2025 TestdateDecember19,2025toDecember22,2025 IssuedateDecember23,2025 TestresultComplied Reviewedby:MorganTan Approvedby:HansHu ReportNo.:CISRR25121732201 Page 2 of 46 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.Testsampleinformation.............................................................................................................................7 5.4.Environmentalconditions...........................................................................................................................7 5.5.Statementofthemeasurementuncertainty.............................................................................................7 5.6.EquipmentUsedduringtheTest................................................................................................................8 6.TESTRESULTS.............................................................................................................................................10 6.1.EvaluationResults(Evaluation)...............................................................................................................10 6.1.1.AntennaRequirement............................................................................................................................10 6.2.RadioSpectrumMatterTestResults(RF)...............................................................................................11 6.2.1.ConductedEmissionatACpowerline.................................................................................................11 6.2.2.MaximumConductedOutputPower.....................................................................................................14 6.2.3.ChannelSeparation................................................................................................................................15 6.2.4.NumberofHoppingFrequencies..........................................................................................................16 6.2.5.DwellTime...............................................................................................................................................17 6.2.6.Conductedbandedgeandspuriousemission...................................................................................19 6.2.7.Radiatedbandedgeemission...............................................................................................................21 6.2.8.RadiatedSpuriousEmission(below1GHz).........................................................................................27 6.2.9.RadiatedSpuriousEmission(Above1GHz)........................................................................................31 7.APPENDIXREPORT......................................................................................................................................39 7.1.ConductedOutputPower.........................................................................................................................39 7.2.20dBBandwidth.........................................................................................................................................40 7.3.DutyCycle..................................................................................................................................................41 7.4.NumberOfHoppingChannel...................................................................................................................42 7.5.CarrierFrequenciesSeparation..............................................................................…

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ReportNo.:CISRR25121732201 Page 48 of 53 8.TESTSETUPPHOTOS ConductedEmissionatACpowerline RadiatedSpuriousEmission(below1GHz) ReportNo.:CISRR25121732201 Page 49 of 53 Radiatedbandedgeemission RadiatedSpuriousEmission(Above1GHz)