2AVJD-K521BWireless earphones

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LocalRepresentativeLetter ForCertificationServiceintheUSA FederalCommunicationsCommission EquipmentAuthorizationDivision,ApplicationProcessingBranch 7435OaklandMillsRoad Columbia,MD21048 Towhomitmayconcern PursuanttoSection2.911(d)(7),oftheCommission’sRules(47C.F.R.)weattestasfollowsfor theproductlistedbelow: FCCIDModelname 2AVJD-K521BK521 Weherebyacknowledgeasfollows: i.bothsigneesconfirmthatthepointofcontactacceptsresponsibilitytoactasaUS- AmericanRepresentativeonbehalfoftheapplicant ii.thepointofcontactprovidesthephysicalU.S.addressandemailaslistedbelow iii.bothpartiesmaintaintherequirementsofthisagreementfornolessthanoneyear afterthegranteehasterminatedallmarketingandimportationortheconclusionof anyCommission-relatedproceedinginvolvingtheequipment. iv.Anexpirationdateforthisletterdoesnotexist.IncasetheU.S.agentchanges,the granteeisobligatedtonotifytheFCCwithin30daysviathegrantingTCB. US-AmericanPointofContactApplicant/ApprovalHolder SignatureDate:2025-11-18SignatureDate:2025-11-18 CompanyName:GLOCERTSTECHNOLOGYINCShenzhenRuianyuanElectronic TechnologyCo.,Ltd. FRN:00363397370029089190 ContactName:HuiyingFanMeizhenLin Address:19784SUNKISSEDRIDGEDR, RIVERSIDE,CA92507UnitedStates Floor4,Building5,Tumao IndustrialPark,HebeiIndustrial Zone,LonghuaDistrict,Shenzhen, China Phone:(626)588-803913502890859 Email:[email protected]@qq.com

Page1of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. ExternalPhotos Photo1 Photo2 Page2of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo3 Photo4 Page3of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo5 Photo6 Page4of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo7 Photo8 Page5of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo9 Photo10 Page6of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo11 Photo12 Page7of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo13 Photo14 Page8of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo15 Photo16 Page9of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo17 Photo18 Page10of10FCCID: 2AVJD-K521B DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. Photo19 ------End------

Label FCCID:2AVJD-K521B

Page 1 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Internal Photos Photo 1 Photo 2 Page 2 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 3 Photo 4 BT Antenna Page 3 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 5 Photo 6 BT Antenna Page 4 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 7 Photo 8 Page 5 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 9 Photo 10 Page 6 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 11 Photo 12 Page 7 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 13 Photo 14 Page 8 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 15 Photo 16 Page 9 of 9FCC ID: 2AVJD-K521B Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 17 ------End------

Page 1 of 8Report No.: AiTDG-250829001W2 Note: This device has been tested and found to comply with the standard(s) listed, this test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. This report shall not be reproduced except in full, without the written approval of Dongguan Yaxu (AiT) Technology Limited. If there is a need to alter or revise this document, the right belongs to Dongguan Yaxu (AiT) Technology Limited, and it should give a prior written notice of the revision document. This test report must not be used by the client to claim product endorsement. Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. RF Exposure evaluation Product Name: Wireless earphones Brand Name: N/A Model: K521 Series Model: N/A FCCID: 2AVJD-K521B Applicant: Shenzhen Ruianyuan Electronic Technology Co., Ltd. Address: Floor 4, Building 5, Tumao Industrial Park, Hebei Industrial Zone,Longhua District, Shenzhen, China Manufacturer: Shenzhen Ruianyuan Electronic Technology Co., Ltd. Address: Floor 4, Building 5, Tumao Industrial Park, Hebei Industrial Zone,Longhua District, Shenzhen, China Standard(s): 47CFR §1.1310,47CFR §2.1093 KDB447498 D01 General RF Exposure Guidance v06 Date of Receipt: Aug. 29, 2025 Date of Test: Aug. 29, 2025~Sep. 11, 2025 Issued Date: Sep. 12, 2025 Issued By: Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China Tel.: +86-769-8202 0499 Fax.: +86-769-8202 0495 Reviewed by:Approved by: Emiya LinSimba Huang Page 2 of 8 Report No.: AiTDG-250829001W2 Report Revise Record Report VersionIssued DateNotes V1.0Sep. 12, 2025Initial Release Page 3 of 8 Report No.: AiTDG-250829001W2 Contents 1 GENERAL INFORMATION.............................................................................................................................................4 1.1ENVIRONMENTAL CONDITIONS........................................................................................................................................4 1.2GENERALDESCRIPTION OFEUT......................................................................................................................................4 1.3TESTFACILITY...............................................................................................................................................................5 1.4MEASUREMENT UNCERTAINTY........................................................................................................................................ 6 2 METHOD OF MEASUREMENT......................................................................................................................................7 2.1APPLICABLESTANDARD................................................................................................................................................. 7 2.2EVALUATIONMETHOD ANDLIMIT...................................................................................................................................7 2.3MANUFACTURINGTOLERANCE........................................................................................................................................8 2.4EVALUATIONRESULT......................................................................................................................................................8 2.5CONCLUSION................................................................................................................................................................8 Page 4 of 8 Report No.: AiTDG-250829001W2 1 GENERAL INFORMATION 1.1 Environmental conditions During the measurement the environmental conditions were within the listed ranges: Normal Temperature:25°C Relative Humidity:55 % Air Pressure:101 kPa 1.2 General Descriptionof EUT Product Name:Wireless earphones Model/Type reference: K521 Serial Model:N/A Power Supply: Charging Case: Input: USB DC 5.0V 3.7V by 200mAh Rechargeable Li-ion battery Earphones: 3.7V by 30mAh Rechargeable Li-ion battery Hardware version.:N/A Software version.:N/A Test sample(s) ID:AiTDG-250829001-1 BT: Modulation:GFSK, π/4-DQPSK, 8-DPSK Operation frequency:2402MHz-2480MHz Channel number:79 Channels Channel separation:1MHz Antenna type:Chip Antenna Antenna gain:2.7dBi Remark:The above DUT's information was declared by manufacturer. For more detailed features description, please refer to the manufacturer’s specifications or the User's Manual. Page 5 of 8 Report No.: AiTDG-250829001W2 1.3 Test Facility TestLaboratory: Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China The test facility is recognized, certified or accredited by the following organizations: CNAS- Registration No: L6177 Dongguan Yaxu (AiT) technology Limited is accredited to ISO/IEC 17025:2017 general Requirements for the competence of testing and calibration laboratories (CNAS-CL01 Accreditation Criteria for the competence of testing and calibration laboratories) on April 18, 2022 FCC-Registration No.: 703111 Designation Number: CN1313 Dongguan Yaxu (AiT) Technology Limited has been registered and fully described in a report filed with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. IC —Registration No.: 6819A CAB identifier: CN0122 The 3m Semi-anechoic chamber of Dongguan Yaxu (AiT) Technology Limited has been registered by Certification and Engineering Bureau of Industry Canada for radio equipment testing with Registration No.: 6819A A2LA-Lab Cert. No.: 6317.01 Dongguan Yaxu (AiT) Technology Limited has been accredited by A2LA for technical competence in the field of electrical testing, and proved to be in compliance with ISO/IEC 17025: 2017 General Requirements for the Competence of Testing and Calibration Laboratori…

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Page1of38ReportNo.:AiTDG-250829001W1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. TESTREPORT ClientInformation: Applicant:ShenzhenRuianyuanElectronicTechnologyCo.,Ltd. Applicantadd.: Floor4,Building5,TumaoIndustrialPark,HebeiIndustrialZone,Longhua District,Shenzhen,China Manufacturer:ShenzhenRuianyuanElectronicTechnologyCo.,Ltd. Manufactureradd.: Floor4,Building5,TumaoIndustrialPark,HebeiIndustrialZone,Longhua District,Shenzhen,China ProductInformation: ProductName:Wirelessearphones ModelNo.:K521 BrandName:N/A FCCID: 2AVJD-K521B Applicablestandards: FCCCFRTitle47Part15SubpartCSection15.247 PreparedBy: DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang,Huangjiang,Dongguan, Guangdong,China Tel.:+86-769-82020499Fax.:+86-769-82020495 DateofReceipt:Aug.29,2025DateofTest:Aug.29,2025~Sep.11,2025 DateofIssue:Sep.12,2025TestResult:Pass ThisdevicedescribedabovehasbeentestedbyDongguanYaxu(AiT)TechnologyLimitedandthetest resultsshowthattheequipmentundertest(EUT)isincompliancewiththeFCCrequirements.Anditis applicableonlytothetestedsampleidentifiedinthereport. Note:Thisreportshallnotbereproducedexceptinfull,withoutthewrittenapprovalofDongguan Yaxu(AiT)TechnologyLimited,thisdocumentmaybealteredorrevisedbyDongguanYaxu(AiT) TechnologyLimited,personalonly,andshallbenotedintherevisionofthedocument.Thistest reportmustnotbeusedbytheclienttoclaimproductendorsement. Reviewedby:Approvedby: EmiyaLinSimbaHuang Page2of38ReportNo.:AiTDG-250829001W1 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............................................................................15 6.4NumberofHoppingFrequency..................................................................................................17 6.5TimeofOccupancy(DwellTime)...............................................................................................18 6.6ConductedSpuriousEmissionsandBandEdgesTest.............................................................20 6.7Restrict-bandBand-edgeMeasurements..................................................................................22 6.8RadiatedEmissionsMeasurement............................................................................................24 6.9ConductedEmissions.................................................................................................................34 6.10Pseudorandomfrequencyhoppingsequence...........................................................................37 7TESTSETUPPHOTOGRAPHSOFEUT.................................................................................................................38 8EXTERNALPHOTOGRAPHSOFEUT....................................................................................................................38 9INTERNALPHOTOGRAPHSOFEUT.....................................................................................................................38 Page3of38ReportNo.:AiTDG-250829001W1 DongguanYaxu(AiT)TechnologyLimited No.22,Jinqianling3rdStreet,Jitigang, Huangjiang,Dongguan,Guangdong,China. REPORTREVISERECORD Report Version ReviseTimeIssuedDateValidVersionNotes V1.0/ Sep.12,2025 ValidInitialrelease Page4of38ReportNo.:AiTDG-250829001W1 DongguanYaxu(AiT)TechnologyLimited No.22…

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2.4GHz 2012 Chip Antenna: RANT0805F245S5 _ Application: WLAN, 802.11b/g, Bluetooth, WLAN, etc... Features SMD, high reliability, ultra Impact, Omni-directional... Part number Information RANT0805F245S5 (A)(B)(C)(D)(E)(F) Electrical Specification Dimension and Terminal Configuration No.Terminal Name 1Feeding/GNG 2GND/Feeding (A)Product TypeChip Antenna (B) Size Code 1.6x0.8mm( ± 0.1mm) (C) MaterialHigh K material (D) Frequency2.4 ~ 2.5GHz (E) Feeding modePIFA & Single Feeding (F) Antenna typeType=5 Working Frequency Range2400 ~2500 MHz Bandwidth120 MHz (Min.) Peak Gain2.7 dBi (Typ.) Impedance50 Ohm Return loss10 dB ( Min) PolarizationLinear Azimuth BeamwidthOmni-directional Operation Temperature(°C)-40 ~85°C Resistance to Soldering Heats 10sec. ( @ 280°C) TerminationNi / Au (Leadless) Dimension (mm) L 2.00±0.10 W 1.20±0.10 T 0.45±0.10 Manufacturer:RAIN International Technology Co., Ltd. Address: Building F, 709, Yuxing Technology Industrial Park, Nanchang Third Industrial Zone, Xiangxiang Sub-district, Bao'an District, Shenzhen City 2.4GHz2012 Chip Antenna:RANT 0805 F245 S5 _ 1 EvaluationBoardReference PCB DimensionUnit :mm ReturnLoss & Radiation 0805 footprint (ANT) 0805 footprint (ANT) 0805 footprint (ANT) 0805 footprint (ANT) 0805 footprint (ANT) 0805 footprint (ANT) 0805 footprint (ANT) 0805 footprint (ANT) 2.4GHz2012 Chip Antenna:RANT 0805 F245 S5 _ 2.4GHz2012 Chip Antenna:RANT 0805 F245 S5 _ TapingSpecifications Reel and TapingSpecification Reel Specification TYPESIZEABCD 16087”4K/Reel 4.0±0.5 4.0 ±213.5 ±0.5178 ±2 TappingSpecification PackagingTypeABWEFGHTψDP PaperType1608 1.90±0.203.50±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.10 1.50±0.10 4.0±0.1 2.4GHz2012 Chip Antenna:RANT 0805 F245 S5 _ ReliabilityTable Test ItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfillthe electrical specification UserSpec. Thermal Shock 1. Preconditioning: 50 ± 10°C/ 1 hr , then keepfor 24 ± 1 hrs at roomtemp. 2. Initialmeasure:Spec:refer Initialspec. 3. Rapidchangeof temperaturetest: -30°Cto +85°C; 100 cycles; 15 minutesat Lowercategorytemperature; 15 minutesat Uppercategorytemperature. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 107 Temperature Cycling 1. Initialmeasure:Spec:refer Initialspec. 2. 100 Cycles(-30°Cto +85°C), SoakMode=1(2 Cycle/hours). 3. Measurementat 24 ± 2Hoursafter test condition. No VisibleDamage. Fulfillthe electrical specification. JESD22 JA104 High Temperature Exposure 1. Initialmeasure:Spec:refer Initialspec. 2. Unpowered;500hours@ T=+85°C. 3. Measurementat 24 ± 2 hoursafter test. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 108 Low Temperature Storage 1. Initialmeasure:Spec:refer Initialspec. 2. Unpowered:500hours@ T= -30°C. 3. Measurementat 24 ± 2 hoursafter test. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 108 Solderability (SMD BottomSide) Dippingmethod: a. Temperature:235 ±5°C b. Dippingtime:3 ±0.5s The soldershouldcover over 95% of the critical area of bottomside. IEC 60384-21/22 4.10 SolderingHeat Resistance (RSH) Preheatingtemperature:150 ± 10 °C. Preheatingtime:1~2 min. Soldertemperature:260 ± 5°C. Dippingtime:5 ± 0.5s No VisibleDamage.IEC 60384-21/22 4.10 Vibration5g's for 20 min.,12 cycleseachof 3 orientations Note:Use 8"X5"PCB .031"thick 7 securepointson, one long side and 2 securepointsat cornersof oppositesides.Parts mountedwithin2" from any securepoint.Test from 10-2000 Hz. No VisibleDamage.MIL-STD-202 Method204 Mechanical Shock Threeshocksin eachdirectionshall be appliedalongthe three mutuallyperpendicularaxesof the test specimen(18 shocks) Peakvalue:1,500g’s Duration:0.5ms Velocitychange:15.4 ft/s Waveform:Half-sine No VisibleDamage.MIL-STD-202 Method213 Humidity Bias 1. Humidity:85% R.H.,Temperature:85 ± 2 °C. 2. Time:500 ± 24 hours. 3. Measurementat 24 ± 2hrs after test condition. No VisibleDamage. Fulfillthe electrical specification. MIL-STD-202 Method106 2.4GHz 2012 Chip Antenna: RANT0805F245S5 _ Board Flex (SMD) 1. Mounting method: IR-Reflow. PCB Size (L:100 × W:40 × T:1.6mm) 2. Apply the load in direction of the arrow until bending reaches 2 mm. No Visible Damage.AEC-Q200 005 AdhesionForce of 1.8Kg for 60 seconds.No Visible Damage Magnification of 20X or greater may be employed for inspection of the mechanical integrity of the device body terminals and body/terminal junction. AEC-Q200 006 Physical Dimension Any applicable method using x10 magnification, micrometers, calipers, gauges, contour projectors, or other measuring equipment, capable of determining the actual specimen dimensions. In accordance with specification. JESD22 JB100 Revision History RevisionDateContent 12019/03/01New Datasheet 22020/02/22Add 2D radiation characteristic

Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 1 of 61 Appendix A RF Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: Wireless earphones Trade Mark: N/A Test Model: K521 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-250829001W1 FCC ID: 2AVJD-K521B Page 2 of 61 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..............................................................................................................................................................................15 3.1Test Result..........................................................................................................................................................................15 3.2Test Graphs.........................................................................................................................................................................16 4 Carrier Frequency Separation.........................................................................................................................................................21 4.1Test Result..........................................................................................................................................................................21 4.2Test Graphs.........................................................................................................................................................................22 5 Hopping Channel Number...............................................................................................................................................................24 5.1Test Result..........................................................................................................................................................................24 5.2Test Graphs.........................................................................................................................................................................25 6 Dwell Time...................................................................................................................................................................................... 27 6.1Test Result..........................................................................................................................................................................27 6.2Test Graphs.........................................................................................................................................................................28 7 RF Conducted Spurious Emissions.................................................................................................................................................31 7.1Test Result..........................................................................................................................................................................31 7.2Test Graphs.........................................................................................................................................................................32 8 Band-edge for RF Conducted Emissions........................................................................................................................................41 8.1Test Result..........................................................................................................................................................................41 8.2Test Graphs.........................................................................................................................................................................42 9 Restrict-band band-edge measurements........................................................................................................................................54 9.1Test Result..........................................................................................................................................................................54 9.2Test Graphs.........................................................................................................................................................................56 Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 3 of 61 1 Duty Cycle 1.1 Test Result ModeFrequency (MHz)Duty Cycle (%)Correction Factor 1/T (kHz) 1-DH1240233.64.742.44 1-DH1244132.84.842.5 1-DH1248032.814.842.5 2-DH1240234.314.652.38 2-DH1244133.614.742.44 2-DH1248033.614.742.44 3-DH1240233.64.742.44 3-DH1244134.44.632.38 3-DH1248034.44.632.38 Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID:…

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Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 38 of 61 8DPSK_LCH_Graphs Pref Puw Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 39 of 61 8DPSK_MCH_Graphs Pref Puw Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 40 of 61 8DPSK_HCH_Graphs Pref Puw Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 41 of 61 8 Band-edge for RF Conducted Emissions 8.1 Test Result Mode Channe l Carrier Frequency [MHz] Frequenc y Hopping Max Spurious Level [dBc] Limit [dBc] Verdict GFSK LCH2402 Off-55.9-20Pass On-55.05-20Pass HCH2480 Off-55.69-20Pass On-56.04-20Pass π/4DQPSK LCH2402 Off-55.71-20Pass On-54.95-20Pass HCH2480 Off-56.41-20Pass On-56.63-20Pass 8DPSK LCH2402 Off-56.35-20Pass On-54.93-20Pass HCH2480 Off-49.82-20Pass On-56.68-20Pass Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 42 of 61 8.2 Test Graphs Test Graphs Pref GFSK/LCH/No Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 43 of 61 Ref GFSK/LCH/Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 44 of 61 Ref GFSK/HCH/No Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 45 of 61 Ref. GFSK/HCH/Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 46 of 61 Ref π/4DQPSK/LCH/No Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 47 of 61 Ref π/4DQPSK/LCH/Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 48 of 61 Ref π/4DQPSK/HCH/No Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 49 of 61 Ref π/4DQPSK/HCH/Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 50 of 61 Ref 8DPSK/LCH/No Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 51 of 61 Ref 8DPSK/LCH/Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 52 of 61 Ref 8DPSK/HCH/No Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 53 of 61 Ref 8DPSK/HCH/Hop Dongguan Yaxu(AiT) Technology Limited Report No.: AiTDG-250829001W1 FCC ID: 2AVJD-K521B Page 54 of 61 9 Restrict-band band-edge measurements 9.1 Test Result Test Mode HoppingFreq. Power [dBm] Gain Duty Factor E [dBuV/m] Detector Limit [dBuV/m] Verdict GFSK Off2310.0-48.632-48.63PEAK74Pass Off2310.0-56.8924.7445.11AV54Pass Off…

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