2BFJ5-DUOZPRO10TWS Headset

ASTRUM WORLD INC

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Application Details

Equipment Class: DSS - Part 15 Spread Spectrum Transmitter
Date of Grant: Dec 10, 2025
Application Purpose: Original Equipment
Equipment Note: TWS Headset
Frequency Range: 2402.00000000 - 2480.00000000
Company: ASTRUM WORLD INC
Country: United States

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Users Manual

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Attestation Statements

Local Representative Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Section 2.911(d)(7), of the Commission’s Rules (47 C.F.R.) we attest as follows for the product listed below: FCC ID Model name 2BFJ5-DUOZPRO10 Duoz Pro10, Duoz ENC10, Duoz ANC10, Duoz Pro20, Duoz ENC20, Duoz ANC20, Duoz Go, Duoz Play We hereby acknowledge as follows: i. both signees confirm that the point of contact accepts responsibility to act as a US- American Representative on behalf of the applicant ii. the point of contact provides the physical U.S. address and email as listed below iii. both parties maintain the requirements of this agreement for no less than one year after the grantee has terminated all junjianeting and importation or the conclusion of any Commission-related proceeding involving the equipment. iv. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. US-American Point of Contact Applicant/Approval Holder Signature Date: 2025-8-6 Signature Date: 2025-8-6 Company Name: {ASTRUM WORLD INC} {ASTRUM WORLD INC} FRN: {0035179522} {0035179522} Contact Name: {PANSARl} {Manoj Kumar} {Nina} {Liu} Address: {3242 W 8th Street #201, Los Angeles CA 90005} {3242 W 8th Street #201, Los Angeles CA 90005} Phone: {+1(213)6031574} {+1(213)6031573} Email: {[email protected]} {[email protected]} Nina Liu (Sep 28, 2025 11:57:32 GMT+8) Nina Liu 置高国际 TWS Headset 美代(2) Final Audit Report2025-09-28 Created:2025-09-28 By:M.K. Pansari ([email protected]) Status:Signed Transaction ID:CBJCHBCAABAANn7l8LRZHArD6c4L3RSxBoRABkGk65Tt History Document created by M.K. Pansari ([email protected]) 2025-09-28 - 3:55:10 AM GMT Document emailed to Liu Shu ([email protected]) for signature 2025-09-28 - 3:55:14 AM GMT Document emailed to M.K. Pansari ([email protected]) for signature 2025-09-28 - 3:55:14 AM GMT Email viewed by Liu Shu ([email protected]) 2025-09-28 - 3:56:21 AM GMT Email viewed by M.K. Pansari ([email protected]) 2025-09-28 - 3:57:29 AM GMT Signer Liu Shu ([email protected]) entered name at signing as Nina Liu 2025-09-28 - 3:57:30 AM GMT Document e-signed by Nina Liu ([email protected]) Signature Date: 2025-09-28 - 3:57:32 AM GMT - Time Source: server Document e-signed by M.K. Pansari ([email protected]) Signature Date: 2025-09-28 - 3:58:08 AM GMT - Time Source: server Agreement completed. 2025-09-28 - 3:58:08 AM GMT

External Photos

Page 1 of 4FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. External Photos Photo 1 Photo 2 Page 2 of 4FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 3 Photo 4 Page 3 of 4FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 5 Photo 6 Page 4 of 4FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 7 ------End------

ID Label/Location Info

Label FCCID:2BFJ5-DUOZPRO10

Internal Photos

Page 1 of 6FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Internal Photos Photo 1 Photo 2 Page 2 of 6FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 3 Photo 4 Page 3 of 6FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 5 Photo 6 Page 4 of 6FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 7 Photo 8 Page 5 of 6FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 9 Photo 10 Page 6 of 6FCC ID: 2BFJ5-DUOZPRO10 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 11 ------End------ BT Antenna BT Antenna

RF Exposure Info

Page 2 of 8 ReportNo.:AiTDG-250805002W2 ReportReviseRecord ReportVersionIssuedDateNotes V1.0Aug.22,2025InitialRelease Page 3 of 8 ReportNo.:AiTDG-250805002W2 Contents 1GENERALINFORMATION.............................................................................................................................................4 1.1ENVIRONMENTALCONDITIONS........................................................................................................................................4 1.2GENERALDESCRIPTIONOFEUT......................................................................................................................................4 1.3TESTFACILITY...............................................................................................................................................................5 1.4MEASUREMENTUNCERTAINTY........................................................................................................................................6 2METHODOFMEASUREMENT......................................................................................................................................7 2.1APPLICABLESTANDARD.................................................................................................................................................7 2.2EVALUATIONMETHODANDLIMIT...................................................................................................................................7 2.3MANUFACTURINGTOLERANCE........................................................................................................................................8 2.4EVALUATIONRESULT......................................................................................................................................................8 2.5CONCLUSION................................................................................................................................................................8 Page 4 of 8 ReportNo.:AiTDG-250805002W2 1GENERALINFORMATION 1.1Environmentalconditions Duringthemeasurementtheenvironmentalconditionswerewithinthelistedranges: NormalTemperature:25°C RelativeHumidity:55% AirPressure:101kPa 1.2GeneralDescriptionofEUT ProductName:TWSHeadset Model/Type reference: DuozPro10 SerialModel: DuozENC10,DuozANC10,DuozPro20,DuozENC20,DuozANC20, DuozGo,DuozPlay,EaseGo**,EasePlay**,EaseTune**,EasePro**, EaseVibe**,EaseMode**.EaseMood**,EaseX**,("*"canbe0-9,A-Z, orablank) PowerSupply: ChargingCase: Input:USBDC5.0V 3.7Vby500mAhRechargeableLi-ionbattery Earphones: 3.7Vby60mAhRechargeableLi-ionbattery Hardwareversion.:N/A Softwareversion.:N/A Testsample(s)ID:AiTDG-250805002-1 BT: Modulation:GFSK,π/4-DQPSK,8-DPSK Operationfrequency:2402MHz-2480MHz Channelnumber:79Channels Channelseparation:1MHz Antennatype:FPCAntenna Antennagain: Left:-1.07dBi Right:-1.01dBi Remark:TheaboveDUT'sinformationwasdeclaredbymanufacturer.Formoredetailedfeatures description,pleaserefertothemanufacturer’sspecificationsortheUser'sManual. Page 5 of 8 ReportNo.:AiTDG-250805002W2 1.3TestFacility TestLaboratory: DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang,Huangjiang,Dongguan,Guangdong,China Thetestfacilityisrecognized,certifiedoraccreditedbythefollowingorganizations: CNAS-RegistrationNo:L6177 DongguanYaxu(AiT)technologyLimitedisaccreditedtoISO/IEC17025:2017generalRequirements forthecompetenceoftestingandcalibrationlaboratories(CNAS-CL01AccreditationCriteriaforthe competenceoftestingandcalibrationlaboratories)onApril18,2022 FCC-RegistrationNo.:703111DesignationNumber:CN1313 DongguanYaxu(AiT)TechnologyLimitedhasbeenregisteredandfullydescribedinareportfiledwith the(FCC)FederalCommunicationsCommission.TheacceptanceletterfromtheFCCismaintainedin ourfiles. IC—RegistrationNo.:6819ACABidentifier:CN0122 The3mSemi-anechoicchamberofDongguanYaxu(AiT)TechnologyLimitedhasbeenregisteredby CertificationandEngineeringBureauofIndustryCanadaforradioequipmenttestingwithRegistration No.:6819A A2LA-LabCert.No.:6317.01 DongguanYaxu(AiT)TechnologyLimitedhasbeenaccreditedbyA2LAfortechnicalcompetencein thefieldofelectricaltesting,andprovedtobeincompliancewithISO/IEC17025:2017General RequirementsfortheCompetenceofTestingandCalibrationLaboratoriesandanyadditionalprogram requirementsintheidentifiedfieldoftesting. Page 6 of 8 ReportNo.:AiTDG-250805002W2 1.4Measurementuncertainty Thedataandresultsreferencedinthisdocumentaretrueandaccurate.Thereaderiscautionedthat theremaybeerrorswithinthecalibrationlimitsoftheequipmentandfacilities.Themeasurement uncertaintywascalculatedforallmeasurementslistedinthistestreportaccordingtoCISPR16- 4“Specificationforradiodisturbanceandimmunitymeasuringapparatusandmethods–Part4: UncertaintyinEMCMeasurements”andisdocumentedintheDongguanYaxu(AiT)Technology Limited’squalitysystemaccordingtoDINENISO/IEC17025.Furthermore,componentandprocess variabilityofdevicessimilartothattestedmayresultinadditionaldeviation.Themanufacturerhasthe soleresponsibilityofcontinuedcomplianceofthedevice. HereafterthebestmeasurementcapabilityforYaxu(AiT)laboratoryisreported: Test Measurement Uncertainty Notes PowerLineConductedEmission150KHz~30MHz±1.20dB(1) RadiatedEmission9KHz~30Hz±3.10dB(1) RadiatedEmission9KHz~1GHz ± 3.75dB(1) RadiatedEmission1GHz~18GHz ± 3.88dB(1) RadiatedEmission18GHz-40GHz±3.88dB(1) Thereportuncertaintyofmeasurementy±U,whereexpendeduncertaintyUisbasedonastandard uncertaintyMultipliedbyacoveragefactorofk=2,providingalevelofconfidenceofapproximately 95%. Page 7 of 8 ReportNo.:AiTDG-250805002W2 2Methodofmeasurement 2.1ApplicableStandard Accordingto§1.1307(b)(1),systemsoperatingundertheprovisionsofthissectionshallbeoperatedin amannerthatensuresthatthepublicisnotexposedtoradiofrequencyenergylevelinexcessofthe Commission’sguidelines. Accordingto§1.1310and§2.1093RFexposureiscalculated. FCCKDB447498D01GeneralRFExposureGuidancev06:MobileandPortableDevice,RFExposure, EquipmentAuthorizationProcedures 2.2EvaluationMethodandLimit AccordingtoKDB4474…

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Test Report

Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250805002W1 FCC ID: 2BFJ5-DUOZPRO10 Page 63 of 66 Restrict-band band-edge measurements_Hopping Off_π/4-DQPSK_PEAK (Low Channel) Restrict-band band-edge measurements_Hopping Off_π/4-DQPSK_Average (Low Channel) Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250805002W1 FCC ID: 2BFJ5-DUOZPRO10 Page 64 of 66 Restrict-band band-edge measurements_Hopping Off_π/4-DQPSK_PEAK (High Channel) Restrict-band band-edge measurements_Hopping Off_π/4-DQPSK_Average (High Channel) Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250805002W1 FCC ID: 2BFJ5-DUOZPRO10 Page 65 of 66 Restrict-band band-edge measurements_Hopping Off_8DPSK_PEAK (Low Channel) Restrict-band band-edge measurements_Hopping Off_8DPSK_Average (Low Channel) Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250805002W1 FCC ID: 2BFJ5-DUOZPRO10 Page 66 of 66 Restrict-band band-edge measurements_Hopping Off_8DPSK_PEAK (High Channel) Restrict-band band-edge measurements_Hopping Off_8DPSK_Average (High Channel) ---The End---

Test Report

Page2of41ReportNo.:AiTDG-250805002W1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. 1Contents Page COVERPAGE 1CONTENTS......................................................................................................................................................................2 2TESTSUMMARY............................................................................................................................................................4 2.1StatementoftheMeasurementUncertainty................................................................................4 2.2MeasurementUncertainty............................................................................................................4 3TESTFACILITY..............................................................................................................................................................5 3.1Deviationfromstandard...............................................................................................................5 3.2Abnormalitiesfromstandardconditions.......................................................................................5 3.3TestLocation.................................................................................................................................5 4GENERALINFORMATION...........................................................................................................................................6 4.1Testfrequencies............................................................................................................................7 4.2EUTPeripheralList.......................................................................................................................8 4.3TestPeripheralList.......................................................................................................................8 4.4TESTMETHODOLOGY...............................................................................................................9 4.5DescriptionofTestModes..........................................................................................................10 5EQUIPMENTUSEDDURINGTEST.........................................................................................................................11 6TESTRESULTSANDMEASUREMENTDATA.....................................................................................................13 6.1Antennarequirement..................................................................................................................13 6.2PeakPowerMeasurement.........................................................................................................14 6.3FrequencySeparationand20dBBandwidth............................................................................16 6.4NumberofHoppingFrequency..................................................................................................18 6.5TimeofOccupancy(DwellTime)...............................................................................................19 6.6ConductedSpuriousEmissionsandBandEdgesTest.............................................................21 6.7Restrict-bandBand-edgeMeasurements..................................................................................23 6.8RadiatedEmissionsMeasurement............................................................................................25 6.9ConductedEmissions.................................................................................................................37 6.10Pseudorandomfrequencyhoppingsequence...........................................................................40 7TESTSETUPPHOTOGRAPHSOFEUT.................................................................................................................41 8EXTERNALPHOTOGRAPHSOFEUT....................................................................................................................41 9INTERNALPHOTOGRAPHSOFEUT.....................................................................................................................41 Page3of41ReportNo.:AiTDG-250805002W1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. REPORTREVISERECORD Report Version ReviseTimeIssuedDateValidVersionNotes V1.0/ Aug.22,2025 ValidInitialrelease Page4of41ReportNo.:AiTDG-250805002W1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. 2TestSummary TestItemSectioninCFR47Result MaximumConductedOutputPower§15.247(b)Pass 20dBBandwidth§15.247(a)Pass FrequencySeparation§15.247(a)Pass NumberOfHoppingFrequency§15.247(a)Pass TimeOfOccupancy (DwellTime) §15.247(a)Pass ConductedSpuriousEmissionsand BandEdgesEmissions §15.205,§15.247(d)Pass RadiatedSpuriousEmissions§15.209,§15.247(d)Pass EmissionsatRestrictedBand§15.205Pass ACMainsConductedEmissions§15.207(a)Pass AntennaRequirements§15.203Pass Note 1.TestaccordingtoANSIC63.10:2020. 2.Themeasurementuncertaintyisnotincludedinthetestresult. 3.Testresultsinothertestreport(RFExposureEvaluationReport) 2.1StatementoftheMeasurementUncertainty Thedataandresultsreferencedinthisdocumentaretrueandaccurate.Thereaderiscautionedthat theremaybeerrorswithinthecalibrationlimitsoftheequipmentandfacilities.Themeasurement uncertaintywascalculatedforallmeasurementslistedinthistestreportacc.ToCISPR16–4 “Specificationforradiodisturbanceandimmunitymeasuringapparatusandmethods–Part4: UncertaintyinEMCMeasurements”andisdocumentedintheAiTqualitysystemacc.ToDINEN ISO/IEC17025.Furthermore,componentandprocessvariabilityofdevicessimilartothattestedmay resultinadditionaldeviation.Themanufacturerhasthesoleresponsibilityofcontinuedcomplianceof thedevice. 2.2MeasurementUncertainty TestItemFrequencyRangeMeasurementUncertaintyNotes RadiatedEmission0.009MHz-30MHz3.10dB(1) RadiatedEmission30MHz-1GHz3.75dB(1) RadiatedEmission1GHz-18G…

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Test Report

承认书 SPECIFICATION FOR APPROVAL 客户名称 Customer Name 客户项目名Customer Project Name Z01 合立讯项目名 Helixun Project Name Z01 客户编码 Customer P/N 合立讯料号 Helixun P/N HLX-Z01-JL 频段 Band 2400-2500MHZ 版本号 Version A0 Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City 产品图纸或实物图片 Drawing or Product Image Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Sample Dimensions Test Report 客户名称 Customer Name 深圳市汇蓝电子有限公司客户料号 Customer P/N 合立讯料号 Helixun P/N HLX-Z01-JL 测试日期 Test Date 2023-12-27 样品数量 Sample Qty. 3 测试人 Inspector 尹永康尺寸编号 Dimension No. 标准 Standard 样品 1 Sample 1 样品 2 Sample 2 样品 3 Sample 3 Pass/NG ①长度 27.95mm± 0.2mm 27.00mm27.90mm27.99mm Pass ②宽度 5.00mm± 0.2mm 5.00mm5.10mm4.95mm Pass ③厚度 0.20mm± 0.05mm 0.22mm0.20mm0.22mm Pass ④ ⑤ ⑥ ⑦ Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City RF Performance Test Report 客户名称 Customer Name 项目名称 Project Name Z01 合立讯料号 Helixun P/N HLX-Z01-JL 频段 Band 2400-2500MHZ 测试日期 Test Date 2023-12-27 测试人 Inspector 天线测试设备简介 Antenna Test Equipment Introduction 测试天线输入特性使用Agilent E5071C and Agilent 5071C矢量网络分析仪；辐射特性利用 ETS 三维近场暗室进行测试，并分别使用 CMW500 和 Agilent 5071C 进行了分析。暗房的测试坐标如下: Test of antenna input characteristics usingAgilent E5071C and Agilent 5071Cvector network analyzer; The radiation pattern of the antenna are tested using the ETS starlab 3D near field Anechoic Chamber, and the instrument is used to agilent8960 E5515 and Agilent E4438C. The test coordinates of the darkroom are as follows: Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City TestSystem Sequence NumberTest Itemequipment S parameterVSWRAgilent 5071C & Agilent 5062A OTA TestTRP&TISAgilent 8960 E5515C& Agilent 4438C&CMW500 ETS&SATIMO Gain & EfficiencyGain & Efficiency ETS&SATIMO Agilent 5071C Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City Manufacturer: Shenzhen Helixin Technology Co., Ltd. Address: Building 2, Jiufang Square, No. 9 Zaizi Road, Gongle Community, Xixiang Subdistrict, Bao'an District, Shenzhen City

Test Report

Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250805002W1 FCC ID: 2BFJ5-DUOZPRO10 Page 1 of 66 Appendix A RF Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: TWS Headset Trade Mark: Test Model: Duoz Pro10 Environmental Conditions Temperature: 24.6  C Relative Humidity:52.4% ATM Pressure:100.0 kPa Test Engineer:Emiya lin Supervised by:Simba Haung Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250805002W1 FCC ID: 2BFJ5-DUOZPRO10 Page 2 of 66 Contents Page COVER PAGE 1 Duty Cycle........................................................................................................................................................................................ 3 1.1Test Result............................................................................................................................................................................3 1.2Test Graphs...........................................................................................................................................................................4 2 Maximum Conducted Peak Output Power........................................................................................................................................ 9 2.1Test Result............................................................................................................................................................................9 2.2Test Graphs.........................................................................................................................................................................10 3 20dB Bandwidth..............................................................................................................................................................................20 3.1Test Result..........................................................................................................................................................................20 3.2Test Graphs.........................................................................................................................................................................21 4 Carrier Frequency Separation.........................................................................................................................................................26 4.1Test Result..........................................................................................................................................................................26 4.2Test Graphs.........................................................................................................................................................................27 5 Hopping Channel Number...............................................................................................................................................................29 5.1Test Result.....................................................................................................................................…

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