2BVL5-YS4BBluetooth headphones

JS272 Wireless bluetooth headset 'user s manual Product diagram •Supportmode: •Bluetooth version: Bluetooth V5.3+BR+ EDR • Product model: JS272 a2dp\avctp\avdtp\avrcp\hfp\spp\smp\att\gap\gatt\ rfcomm\sdp\I2capprofile • Sensitivity: -90dBm • Signal distance: ≥10 meters (without any large obstaclesIn an ideal environment) • Battery specifications: headset 3.7V/110mA,charging box ,3.7V/300mA • Play time: about 12 hours •Talk time: about 10 hours • Standby time: about 300 hours • Charging time: charge the charging box for about 2 hours, give Charge the headset for about 3 hour • Number of times the charging box charges the headset: 3 times for a single headset Functional operating instructions 1. power on Take the earphone out of the charging box and turn it on automatically; Auricular organ shape State, press and hold the earphone multi-function touch area for 2 seconds to power on. 2. Shut down Long press the multifunctional touch area of the earphone for about 3 seconds to turn off the earphone. Or put it in the charging bin to turn it off automatically, and the red indicator light of the earphone is always on. 3. Start up and connect back After the earphone is taken out of the charging bin, it will be automatically turned on and connected back, and automatically connected back to the mobile phone that was connected last time and turned on Bluetooth. 4. Pause/Play When the music is waiting to be played, press the multi-function touch area of the earphone cyclically to play/pause the music. 5. Switch songs/volume addition and subtraction/enable Siri In the music playing state, quickly double-click the right earphone touch area to switch to the next song, and quickly double-click the left earphone touch area Switch to the previous song Left ear touch area under combo 3-volume plus (boot default is the most Loud volume), double-click the Right ear touch area 3 times-volume reduction Press and hold the earphone touch area for 2 seconds to enable Siri function 6. Answer/refuse/hang up the call When the mobile phone calls, press the left/right earphone touch area briefly to answer the phone, and press it for 2 seconds to refuse to answer the phone; During a call, press the left/right earphone touch area briefly to hang up the call. 7. Low power prompt When the battery of Bluetooth headset is low, "No battery" will be prompted by voice, and the headset will be turned off when the battery is too low. Pairing operation Turn it off, and press the left and right earphone touch keys for 2 seconds to turn it on. When it is found that there is no light flashing while the red and blue lights flash alternately, it means that the earphone pairing is successful. Set Bluetooth on the mobile phone, check and search the corresponding earphone Bluetooth name, and click the earphone name to successfully pair with the mobile phone. Charging 1. Put the earphone into the charging bin, the earphone is automatically charged and the red prompt light is always on, and the racing indicator lights on both sides of the display run circularly. When the earphone is fully charged, the red prompt light and racing indicator lights go out. Into influence. 3. Try to avoid using this earphone in places with interference sources. 2. Connect one end of Type-C data to a 5V power adapter, and the other end of Type-C port to the charging box to charge the charging box. The red indicator on the display screen flashes, and the red indicator is always on when the battery is fully charged . Matters needing attention 1. Please charge in a safe environment, and then charge the charging bin. In case of power-on, please put the charging bin after the display indicates full power. Disconnect from the charging cable, so as not to insert the charging pair for a long time Damage caused by charging compartment. 2. When playing music, please adjust the music to the appropriate volume Size, so as to avoid long-term listening in the state of high volume Otherwise, it may affect the earphone signal. 4. Try to avoid using this earphone in corrosive environment. So as not to affect the function of the earphone. Power display Type-C Charging contacts Charging LED indicator ejector Touch area —Consult the dealer or an experienced radio/TV technician for help.Warning: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. The device has been evaluated to meet general RF exposure requirement. The device 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, 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. can be used in portable exposure condition without restriction.

COMPANYLETTERHEAD CoveredEquipmentCertificationAttestationLetter 4/10/2026 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA ATTN.:ReviewingEngineer FCCID:2BVL5-YS4B (GuangzhouYouxijiaXinxikejiYouxiangongsi)certifiesthattheequipmentforwhich authorizationissoughtisnot“covered”equipmentprohibitedfromreceivingan equipmentauthorizationpursuanttosection2.903oftheFCCrules. Note:Iftheequipmentforwhichtheapplicantseeksauthorizationisproducedby anyoftheentitiesidentifiedonthecurrentCoveredList,theapplicantshould includeanexplanationonwhytheequipmentisnot“covered”equipment. (GuangzhouYouxijiaXinxikejiYouxiangongsi)certifiesthat,asofthedateofthefilingof theapplication,theapplicantisnotidentifiedontheCoveredList(asaspecifically namedentityoranyofitssubsidiariesoraffiliates)asanentityproducing“covered” equipment. (GuangzhouYouxijiaXinxikejiYouxiangongsi)certifiesthattheequipmentforwhich authorizationissoughtdoesnotincludecybersecurityoranti-virussoftwareproducedor providedbyKasperskyLab,Inc.oranyofitssuccessorsandassignees,including equipmentwithintegratedKasperskyLab,Inc.(oranyofitssuccessorsandassignees) cybersecurityoranti-virussoftwarepursuanttoDA-24-886andKDB986446D01 CoveredEquipmentGuidancesectionB(2a). Signed: Printedname:KennyLee Title:Manager CompanyName:GuangzhouYouxijiaXinxikejiYouxiangongsi Date:4/10/2026

* the applicant must designate a contact located in the United States for purposes of acting as the applicant’s agent for service of process, regardless of whether the applicant is a domestic or foreign entity. An applicant located in the United States may designate itself as the agent for service of process. SC6043920 U.S. Agent Designation for Service of Process - Certification Attestation Letter 4/16/2026 TO: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 ATTN.: Reviewing Engineer FCC ID: 2BVL5-YS4B FRN of applicant: 0038279675 Per section 2.911(d)(7) of the FCC rules, Guangzhou Youxijia Xinxikeji Youxiangongsi FRN: 0038279675(“the applicant”) certifies that the equipment for which authorization is sought is designated to the following U.S. agent* for service of process: Company Name: Global Product Services and Consultation LLC FCC Registration Number (FRN): 0033406703 Physical U.S. Company Address: 328 W Palm Ave. Monrovia, CA91016 Contact Person: Michael Chan Tel: +1 626 366 4358 Agent Email Address: [email protected] The above contact person accepts the obligation for service of process. The applicant 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 the equipment. Applicant Signed: Agent Signed (if different from Applicant): Signed: Printed name: Kenny Lee Title: Manager Company Name: Guangzhou Youxijia Xinxikeji Youxiangongsi Date: 4/10/2026 Signed: Printed name: Michael Chan Title: Technical Director Company Name: Global Product Services and Consultation LLC Date: 4/16/2026

DATE:2026/4/10 FederalCommunicationsCommission Authorization&EvaluationDivision 7345OaklandMillsRoad Columbia,Maryland21046 AuthoritytoActasAgent Onourbehalf,IappointShenzhenVOPTestingTechnologyCo.,Ltd.103,Building5, WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen, GuangdongPeople'sRepublicofChinatoactasouragentinthepreparationofthis applicationforequipmentcertification.Icertifythatsubmitteddocumentsproperlydescribe thedeviceorsystemforwhichequipmentcertificationissought.Ialsocertifythateach unitmanufactured,importedormarketed,asdefinedintheFederalCommunications Commission’sregulationswillhaveaffixedtoitalabelidenticaltothatsubmittedfor approvalwiththisapplication. Forinstanceswhereourauthorizedagentsignstheapplicationforcertificationonour behalf,Iacknowledgethatallresponsibilityforcomplyingwiththetermsandconditions forcertification,stillresideswithGuangzhouYouxijiaXinxikejiYouxiangongsiTianhequ Tianhelu490Hao33Ceng3305FangB148GuangzhoushiChina <Signature> Name ： KennyLee Title ： Manager ApplicantCompany ： GuangzhouYouxijiaXinxikejiYouxiangongsi

Date：2026/4/10 FederalCommunicationsCommission Authorization&EvaluationDivision 7345OaklandMillsRoad Columbia,Maryland21046 RE:LETTEROFAGENTAUTHORIZATION ToWhomItMayConcern: We,theundersigned,herebyauthorizeComplianceTesting,LLCtoactonourbehalfinallmatters relatingtoapplicationforequipmentauthorization,includingthesigningofalldocumentsrelatingto thesematters. Wealsoherebycertifythatnopartytotheapplicationauthorizedhereunderissubjecttothedenialof benefits,includingFCCbenefits,pursuanttoSection5301oftheAnti-DrugAbuseActof1988,21 U.S.C.853(a). Sincerely, <Signature> Name ： KennyLee Title ： Manager Company ： GuangzhouYouxijiaXinxikejiYouxiangongsi

DATE ： 2026/4/10 EquipmentAutorisationDivision FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 FCCID:2BVL5-YS4B ProductName:Bluetoothheadphones RequestforConfidentiality PursuanttoSections0.457and0.459ofthecommission’srules,weherebyrequestthat thefollowingdocumentsbeheldconfidential: (Listherethedocumentsforwhichyouareseekingconfidentiality–forexample...)  Schematics Blockdiagram Operationdescription Thesematerialscontaintradesecretsandproprietaryinformationandarenot customarilyreleasedtothepublic.Thepublicdisclosureofthisinformationmightbe harmfultothecompanyandprovideunjustifiedbenefitstoourcompetitors. <Signature> Name：KennyLee Title：Manager Company ： GuangzhouYouxijiaXinxikejiYouxiangongsi

GuangzhouYouxijiaXinxikejiYouxiangongsi I,thesigner,KennyLee Allmodelsareidenticaltoeachotherexceptformodelnameandappearance. Theyareelectricallyidentical.Modelnamedifferenceisforcommercialpurpose. ItemName: Bluetoothheadphones ModelNumber: YS4B AdditionalModel:YB1,YB2,YB3,YB4,YB5,YB6,YB7,YB8,YB9,YB10,YB11,YB12,YB13,YB14,YB15, YB16,YB17,YB18,YB19,YB20,YB21,YB22,YB23,YB24,YB25,YB26,YB27,YB28,YB29, YB30,YB31,YB32,YB33,YB34,YB35,YB36,YB37,YB38,YB39,YB40,YO1,YO2,YO3,YO4, YO5,YO6,YO7,YO8,YO9YO10,YO11,YO12,YO13,YO14,YO15,YO16,YO17,YO18,YO19, YO20,YO21,YO22,YO23,YO24,YO25,YO26,YO27,YO28,YO29,YO30 Sincerely, <Signature> Name ： KennyLee Title ： Manager Company：GuangzhouYouxijiaXinxikejiYouxiangongsi

EUTExternalphotos

FCCID:2BVL5-YS4B

EUTInternalphotos

Page1of8ReportNo.:VOP20260318001ER2-R01 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] FCCTestReport Applicant’sname:GuangzhouYouxijiaXinxikejiYouxiangongsi Address:TianhequTianhelu490Hao33Ceng3305FangB148GuangzhoushiChina Manufacture'sName:FoshanTongxinElectronicTechnologyCo.,Ltd. Address: 2ndFloor,No.28,Gongye3rdRoad,LeliuCommunity,LeliuStreet, ShundeDistrict,FoshanCity,GuangdongProvince528322 Productdescription Tradermark:N/A ProductName::Bluetoothheadphones Modeland/ortypereference:YS4B SerialModel:YB1（Forothermodels,pleaserefertopagetwo.） Rating(s):DC5V Standards: FCC47CFR§2.1093 KDB447498D01GeneralRFExposureGuidancev06 FCCID:2BVL5-YS4B TheEUTdescribedabovehasbeentestedbyuswiththelistedstandardsandfoundincompliancewiththeFCC requirements.ItispossibletouseFCCmarkingtodemonstratethecompliancewiththisFCCrequirements. Note:Thispublicationmaybereproducedinwholeorinpartfornon-commercialpurposesaslongastheShenzhen VOPTestingTechnologyCo.,Ltd.isacknowledgedascopyrightownerandsourceofthematerial.ShenzhenVOP TestingTechnologyCo.,Ltd.takesnoresponsibilityforandwillnotassumeliabilityfordamagesresultingfromthe reader'sinterpretationofthereproducedmaterialduetoitsplacementandcontext. DateofTest Date(s)ofperformanceoftests:2026-03-18~2026-04-21 DateofIssue:2026-04-21 TestResult:Pass Preparedby: ProjectEngineer Reviewedby: ProjectSupervisor Approvedby: TechnicalDirector $5*1&V Page2of8ReportNo.:VOP20260318001ER2-R01 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Othermodels：YB1,YB2,YB3,YB4,YB5,YB6,YB7,YB8,YB9,YB10,YB11,YB12,YB13,YB14,YB15, YB16,YB17,YB18,YB19,YB20,YB21,YB22,YB23,YB24,YB25,YB26,YB27,YB28,YB29, YB30,YB31,YB32,YB33,YB34,YB35,YB36,YB37,YB38,YB39,YB40,YO1,YO2,YO3,YO4, YO5,YO6,YO7,YO8,YO9YO10,YO11,YO12,YO13,YO14,YO15,YO16,YO17,YO18,YO19, YO20,YO21,YO22,YO23,YO24,YO25,YO26,YO27,YO28,YO29,YO30 Page3of8ReportNo.:VOP20260318001ER2-R01 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] REPORTREVISERECORD ReportVersionReviseTimeIssuedDateValidVersionNotes V1.0/2026-04-21ValidInitialRelease Page4of8ReportNo.:VOP20260318001ER2-R01 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Contents Contents..........................................................................................................................................................................4 1.TESTSUMMARY........................................................................................................................................................5 2.TESTFACILITY...........................................................................................................................................................5 2.1.DeviationfromStandard...................................................................................................................................5 2.2.AbnormalitiesfromStandardConditions..........................................................................................................5 3.GENERALINFORMATION.........................................................................................................................................6 3.1.GeneralDescriptionofEUT..............................................................................................................................6 3.2.EUTTestMode.................................................................................................................................................6 3.3.AuxiliaryEquipmentUsedDuringTest.............................................................................................................6 4.TESTRESULTS..........................................................................................................................................................7 4.1.Radiofrequencyradiationexposureevaluation:portabledevices....................................................................7 4.1.1.Conclusion:.............................................................................................................................................8 Page5of8ReportNo.:VOP20260318001ER2-R01 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 1.TESTSUMMARY No.TestItemBasicStandardResult 1 Radiofrequencyradiationexposure evaluation:portabledevices FCC47CFR§2.1093 PASS 2.TESTFACILITY ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,Guangdong People'sRepublicofChina FCC:DesignationNumber:CN1438,CertificateNumber:7579.01 2.1.DeviationfromStandard None 2.2.AbnormalitiesfromStandardConditions None Page6of8ReportNo.:VOP20260318001ER2-R01 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 3.GENERALINFORMATION 3.1.GeneralDescriptionofEUT Manufacturer:FoshanTongxinElectronicTechnologyCo.,Ltd. ManufacturerAddress: 2ndFloor,No.28,Gongye3rdRoad,LeliuCommunity,LeliuStreet,ShundeDistrict, FoshanCity,GuangdongProvince528322 EUTName:Bluetoothheadphones ModelNo:YS4B SerialModel: YB1,YB2,YB3,YB4,YB5,YB…

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Page1of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] AppendixReport 1.DutyCycle 1.1TestResult 1.1.1Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type T_on (ms) Period (ms) DutyCycle (%) DutyCycle CorrectionFactor(dB) Max.DC Variation(%) GFSKSISO 2402DH52.9133.74977.701.100.03 2441DH52.9133.74977.701.100.03 2480DH52.9143.75077.711.100.03 Pi/4DQPSKSISO 24022DH52.9193.75077.841.090.03 24412DH52.9193.74977.861.090.01 24802DH52.9203.75077.871.090.01 8DPSKSISO 24023DH52.9233.75077.951.080.03 24413DH52.9223.74977.941.080.03 24803DH52.9233.75077.951.080.03 Page2of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 1.2TestGraph 1.2.1Ant1 GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV Page3of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV Page4of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV Page5of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV Page6of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV Page7of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 2.Bandwidth 2.1TestResult 2.1.1OBW Mode TX Type Frequency (MHz) Packet Type ANT 99%OccupiedBandwidth(MHz) Verdict ResultLimit GFSKSISO 2402DH510.855/Pass 2441DH510.850/Pass 2480DH510.853/Pass Pi/4DQPSKSISO 24022DH511.157/Pass 24412DH511.157/Pass 24802DH511.161/Pass 8DPSKSISO 24023DH511.170/Pass 24413DH511.172/Pass 24803DH511.169/Pass 2.1.220dBBW Mode TX Type Frequency (MHz) Packet Type ANT 20dBBandwidth(MHz) Verdict ResultLimit GFSKSISO 2402DH510.925/Pass 2441DH510.927/Pass 2480DH510.931/Pass Pi/4DQPSKSISO 24022DH511.258/Pass 24412DH511.256/Pass 24802DH511.256/Pass 8DPSKSISO 24023DH511.267/Pass 24413DH511.270/Pass 24803DH511.267/Pass Page8of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 2.2TestGraph 2.2.1OBW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV Page9of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV Page10of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV Page11of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV Page12of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV Page13of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] 2.2.220dBBW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV Page14of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV Page15of62ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant…

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Page1of88ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] RadioTestReport 47CFRPart15.247 Applicant’sname:GuangzhouYouxijiaXinxikejiYouxiangongsi Address:TianhequTianhelu490Hao33Ceng3305FangB148GuangzhoushiChina Manufacture'sName:FoshanTongxinElectronicTechnologyCo.,Ltd. Address: 2ndFloor,No.28,Gongye3rdRoad,LeliuCommunity,LeliuStreet, ShundeDistrict,FoshanCity,GuangdongProvince528322 Productdescription Tradermark:N/A ProductName::Bluetoothheadphones Modeland/ortypereference:YS4B SerialModel:YB1（Forothermodels,pleaserefertopagetwo.） Rating(s):N/A Standards:47CFRPart15.247 FCCID:2BVL5-YS4B TheEUTdescribedabovehasbeentestedbyuswiththelistedstandardsandfoundincompliancewiththeFCC requirements.ItispossibletouseFCCmarkingtodemonstratethecompliancewiththisFCCrequirements. Note:Thispublicationmaybereproducedinwholeorinpartfornon-commercialpurposesaslongastheShenzhen VOPTestingTechnologyCo.,Ltd.isacknowledgedascopyrightownerandsourceofthematerial.ShenzhenVOP TestingTechnologyCo.,Ltd.takesnoresponsibilityforandwillnotassumeliabilityfordamagesresultingfromthe reader'sinterpretationofthereproducedmaterialduetoitsplacementandcontext. DateofTest Date(s)ofperformanceoftests:2026-03-18~2026-04-21 DateofIssue:2026-04-21 TestResult:Pass Preparedby: ProjectEngineer Reviewedby: ProjectSupervisor Approvedby: TechnicalDirector $5*1&V Page2of88ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Othermodels：YB1,YB2,YB3,YB4,YB5,YB6,YB7,YB8,YB9,YB10,YB11,YB12,YB13,YB14,YB15, YB16,YB17,YB18,YB19,YB20,YB21,YB22,YB23,YB24,YB25,YB26,YB27,YB28,YB29, YB30,YB31,YB32,YB33,YB34,YB35,YB36,YB37,YB38,YB39,YB40,YO1,YO2,YO3,YO4, YO5,YO6,YO7,YO8,YO9,YO10,YO11,YO12,YO13,YO14,YO15,YO16,YO17,YO18,YO19, YO20,YO21,YO22,YO23,YO24,YO25,YO26,YO27,YO28,YO29,YO30 Page3of88ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] REPORTREVISERECORD ReportVersionReviseTimeIssuedDateValidVersionNotes V1.0/2026-04-21ValidInitialRelease Page4of88ReportNo.:VOP20260318001ER1-R02 ShenzhenVOPTestingTechnologyCo.,Ltd. Add:103,Building5,WanyanIndustrialParkQiaotouCommunity,FuhaiStreet,BaoanDistrictShenzhen,GuangdongPeople'sRepublicofChina TEL:+86-75523090787Website:www.vop-lab.comE-mail:[email protected] Contents Contents..........................................................................................................................................................................4 1.TESTSUMMARY........................................................................................................................................................6 2.MEASUREMENTUNCERTAINTY..............................................................................................................................6 3.TESTFACILITY...........................................................................................................................................................7 3.1.DeviationfromStandard...................................................................................................................................7 3.2.AbnormalitiesfromStandardConditions..........................................................................................................7 4.GENERALINFORMATION.........................................................................................................................................8 4.1.GeneralDescriptionofEUT..............................................................................................................................8 4.2.EUTTestMode...............................................................................................................................................10 4.3.AuxiliaryEquipmentUsedDuringTest...........................................................................................................10 5.EQUIPMENTSLISTFORALLTESTITEMS............................................................................................................11 6.TESTRESULTS........................................................................................................................................................13 6.1.Antennarequirement......................................................................................................................................13 6.1.1.Conclusion:...........................................................................................................................................13 6.2.ConductedEmissionatACpowerline...........................................................................................................14 6.2.1.EUTOperation......................................................................................................................................14 6.2.2.TestSetupDiagram:.............................................................................................................................14 6.2.3.TestData...............................................................................................................................................15 6.3.20dBBandwidth..............................................................................................................................................17 6.3.1.EUTOperation...........................................................................................................................…

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