2BRD9-M144TWS Wireless earphone

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YUEHANG INDUSTRIAL LIMITED Add: RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong, China Date: 2025-11-29 FCC ID: 2BRD9-M144 Dear Sir/Madam, We, YUEHANG INDUSTRIAL LIMITED Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these models are same, Only model number is different for these models: Product name: TWS Wireless earphone Model no.: M144, M140, M145 Additionally, for each model above, the left&right earphones are the same schematic circuits, but the locations of components are different. Refer to the follow photos: Left Right YUEHANG INDUSTRIAL LIMITED Add: RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong, China Sincerely, Name/Title： Jianying Li/Manager Company: YUEHANG INDUSTRIAL LIMITED Address: RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong, China Phone: 13538214502 Fax: E-Mail: [email protected]

Shenzhen HTT Technology Co., Ltd. Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 1 of 14 Product Name: TWS Wireless earphone Model No.: M144 EUT Constructional Details External Photo Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 2 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 3 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 4 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 5 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 6 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 7 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 8 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 9 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 10 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 11 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 12 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 13 of 14 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 14 of 14 ------End------

Label and Location Size: L: 1.0cm*W: 0.2cm Label and Location FCC ID : 2BRD9-M144

Shenzhen HTT Technology Co., Ltd. Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 1 of 6 Product Name: TWS Wireless earphone Model No.: M144 Internal Photos of the EUT Left side Photo Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 2 of 6 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 3 of 6 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 4 of 6 Right side Photo Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 5 of 6 Report No.: HTT202511277 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park,Hangcheng Road, Nanchang Community, Xixiang Street, Bao'an District, Guangdong Province, Shenzhen, China Page 6 of 6 ------End------

Shenzhen HTT Technology Co., Ltd. Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 1 of 9 RF Exposure evaluation Report Reference No. ..................... : FCC ID............................................. : HTT202511277F02 2BRD9-M144 Compiled by ( position+printed name+signature) . : File administrators Supervised by ( position+printed name+signature) . : Project Engineer Approved by ( position+printed name+signature) . : RF Manager Date of issue .................................... : Nov. 18, 2025 Testing Laboratory Name .............. : Shenzhen HTT Technology Co.,Ltd. Address............................................ : 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao’an District, Shenzhen, Guangdong, China Applicant’s name ............................ : YUEHANG INDUSTRIAL LIMITED Address............................................ : RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong,China Standard ........................................... : 47CFR §1.1310 47CFR §2.1093 KDB447498 D01 General RF Exposure Guidance v06 Shenzhen HTT Technology Co.,Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HTT Technology Co.,Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HTT Technology Co.,Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : TWS Wireless earphone Manufacturer .................................... : YUEHANG INDUSTRIAL LIMITED Trade Mark ........................................ N/A Model/Type reference ...................... : M144 Rating ............................................... : Headphone battery capacity:3.7V/40mAh (polymer battery) Charging bin battery capacity:3.7V/300mAh (polymer battery) Charging interface :USB Type-C Result ............................................... : PASS Report No.: HTT202511277F02 Page 2 of 9 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 2 of 9 T E S T R E P O R T Equipment under Test : TWS Wireless earphone Model /Type : M144 Listed Models : M140, M145 Applicant : YUEHANG INDUSTRIAL LIMITED Address : RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong,China Manufacturer : YUEHANG INDUSTRIAL LIMITED Address : RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong,China Test Result: PASS The 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. Report No.: HTT202511277F02 Page 3 of 9 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 3 of 9 Contents 1 T E S T S T A N D A R D S ................................................... 4 2 S U M M A R Y .............................................................. 5 2.1 General Remarks 5 2.2 Product Description 5 2.3 Special Accessories 5 2.4 Modifications 5 3 T E S T E N V I R O N M E N T 6 3.1 Address of the test laboratory 6 3.2 Test Facility 6 3.3 Statement of the measurement uncertainty 6 4 T E S T L I M I T 7 4.1 Requirement 7 4.2 Conducted Power Results 8 4.3 Manufacturing tolerance 8 4.4 Evaluation Result 9 4.5 Simultaneous Transmission for SAR Exclusion 9 5 C O N C L U S I O N 9 Report No.: HTT202511277F02 Page 4 of 9 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 4 of 9 1 T E S T S T A N D A R D S The tests were performed according to following standards: ANSI C95.1–1999: IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. FCC KDB 447498 D01 General RF Exposure Guidance v06: Mobile and Portable Device, RF Exposure, Equipment Authorization Procedures. FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits. FCC CFR 47 part2 2.1093: Radiofrequency radiation exposure evaluation: portable devices Report No.: HTT202511277F02 Page 5 of 9 Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China Page 5 of 9 2 S U M M A R Y 2.1 General Remarks Date of receipt of test sample : Nov. 05, 2025 Testing commenced on : Nov. 05, 2025 Testing concluded on : Nov. 18, 2025 2.2 Product Description Product description: TWS Wireless earphone Model/Type reference: M144 Power supply: Headphone battery capacity:3.7V/40mAh (polymer battery) Charging bin battery capacity:3.7V/300mAh (polymer battery) Charging interface :USB Type-C Adapter Information (Auxiliary test provided by the lab): Mode: GS-0500200 Input: AC100-240V, 50/60Hz, 0.3A max Output: DC 5V, 2A Testing sample ID： HTT202511277-1# (Engineer sample) HTT202511277-2# (Normal sample) Hardware version: / Software version: / Bluetooth : Supported Type: Bluetooth BR/EDR Modulation: GFSK,…

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咏成國際科技有限公司 RAINInternationalTechnologyCo.,Ltd. Page1 咏成国际科技有限公司 RAINInternationalTechnologyCo.,Ltd. P/N:YC1608FX01，YC1608FX07，YC1608FX08 Features 1.Surfacemounteddeviceswithasmalldimensionof1.6×0.8×0.8mmmeetfutureminiaturization trend. 2.EmbeddedandLTCC(lowtemperatureco-firedceramic)technologyisabletointegratewith systemdesignaswellasbeatifyingthehousingoffinalproduct. 3.Highstabilityandlowtolerance. Applications 1.Bluetooth 2.WirelessLAN 3.ISMband2.4GHzwirelessapplications Dimensions(Unit:mm) L ② (TopView) A (BottomView) NumberTerminalName ① INPUT ② NC T (SideView) SymbolsLWTA Dimensions 1.60±0.200.80±0.200.80±0.200.30±0.10 ① w P/N:YC1608FX01/07/08 天线位于板子内部或中间位置时(长条式耳机)： 0201/0402footprint G W G L Unit:mm 0603antennafootprint 1.5 0.5 0.5 Feedingline(微带线) 0201/0402footprint 1.图示中的尺寸为标准封装，仅作为参考；净空区的尺寸会根据每个版型进行 调整和优化。 2.天线最优放置于 PCBA 的中间区域。 3.净空区周围最优需要至少一排过孔，与PCBA上的其它回路或物料进行隔离。 4.G 最优为 1.5~2mm , W 最优为 3~5mm ， L 最优为 4~6mm 。 5.天线性能与版型、组装、佩戴等相关，因而各版型的性能会有所不同。 Page2 Page3 P/N:YC1608FX07/08 天线位于板子边缘位置时(入耳式耳机和部分长条式耳机) L G 0603 footprint H 1.图示中的尺寸为标准封装，仅作为参考；净空区的尺寸会根据每个版型进行 调整和优化。 2.天线最优放置于PCBA的边缘；天线及其走线设置在单层； 3.净空区周围最优需要至少一排过孔，与PCBA上的其它回路或物料进行隔离。 4.G 最优为 1~2mm , H 最优为最大， L 最优为 2~3mm 。 5.天线性能与版型、组装、佩戴等相关，因而各版型的性能会有所不同。 Page4 ElectricalCharacteristics Feature Specification 1 Centralfrequency 2.45GHz&5.5GHz 2 Bandwidth >100MHz 3 Peakgain>3dBi 4 VSWR<2 5 PolarizationLinear 6 AzimuthbeamwidthOmnidirectional 7 Impedance50Ω CharacteristicCurves Page5 RadiationPattern coordinates： Y-ZPlane X-ZPlane Page6 3DRadiationPattern Frequency 2450MHz5500MHz Avg.gain -0.85 -1.30 Peakgain3.03.5 Efficiency82%78% Page7 DependabilityTest TestTemperature OperatingTemperature Temperature RelativeHumidity MoistureProof Temperature：40±2°C Duration：500h 25°C±3°C -25C~+85C 5~40°C 20~70% Humidity：90~95%RH Recoveryconditions：RoomtemperatureRecoveryTime：24h(Class1)or48h(Class2) Solderability Atleast95%oftheterminalelectrodeiscoveredbynewsolder. Preheatingconditions:80to120°C;10~30s. SolderTemperature:235±5°CDuration:2±0.5s,SolderTemperature:245±5°CDuration:2±0.5s OptimumSolderAmountforReflowSoldering Toomuchsolder Notenoughsolder Crackstendtooccurduetolargestress. Weakholdingforcemaycausebadconnection betweenthechipandPCB. RecommendedSolderingAmounts Theoptimalsolderfilletamountsforre-flowsolderingTheoptimalsolderfilletamountsforwavesoldering 天线厚度 以下 Page8 TemperatureCycleTest 10±1SAppliedForce:5NDuration:10±1S Preheatingconditions:up-categorytemperature,1h Recoverytime:24±1h InitialMeasurement CyclingTimes:5times,1cycle,4steps: ResistancetoSolderingHeat Preheating80to120°C;10~30s.SolderTemperature:235±5°C;Duration:2±0.5s;SolderTemperature:245±5°C Duration:2±0.5s;Preheating100to200°C;10±2min. SolderTemperature:265±5°C;Duration:10±1s Cleanthecapacitorwithsolventandexamineitwitha10X(min.)microscope. RecoveryTime:24±2h Recoverycondition:Roomtemperature ResistancetoFlexureofSubstrate TestBoard:Al 2 O 3 orPCBWarp:1mmSpeed:0.5mm/sec. Unit:mm Themeasurementshouldbemadewiththeboardinthebendingposition. Whileinpreheating,pleasekeepthetemperaturedifferencebetweensolderingtemperatureandsurface temperatureofchipsas:T≤150°C. Page9 Page10 Dimensionsofpapertaping Unit：mm 尺寸 Reel ( 4000pcs/Reel ) StoragePeriod Theguaranteedperiodforsolderabilityis6months(Underdeliverpackagecondition). Temperature:5~40°C/RelativeHumidity:20~70%

1 Appendix RF Test Data for BT Company: : YUEHANG INDUSTRIAL LIMITED EUT : TWS Wireless earphone FCC ID: : 2BRD9-M144 Model Number : M144 Report No. : HTT202511277F01 Reviewed By : Heber He 2 1. Duty Cycle 1.1 Test Result 1.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type T_on (ms) Period (ms) Duty Cycle (%) Duty Cycle Correction Factor (dB) Max. DC Variation (%) GFSK SISO 2402 DH5 2.913 3.749 77.70 1.10 0.01 2441 DH5 2.913 3.749 77.70 1.10 0.03 2480 DH5 2.913 3.749 77.70 1.10 0.03 Pi/4DQPSK SISO 2402 2DH5 2.920 3.750 77.87 1.09 0.01 2441 2DH5 2.919 3.750 77.84 1.09 11.05 2480 2DH5 2.919 3.749 77.86 1.09 0.01 8DPSK SISO 2402 3DH5 2.923 3.750 77.95 1.08 0.01 2441 3DH5 2.922 3.749 77.94 1.08 0.03 2480 3DH5 2.923 3.750 77.95 1.08 0.03 3 1.2 Test Graph 1.2.1 Ant1 GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 4 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV 5 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV 6 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV 7 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV 8 2. Bandwidth 2.1 Test Result 2.1.1 OBW Mode TX Type Frequency (MHz) Packet Type ANT 99% Occupied Bandwidth (MHz) Verdict Result Limit GFSK SISO 2402 DH5 1 0.843 / Pass 2441 DH5 1 0.846 / Pass 2480 DH5 1 0.843 / Pass Pi/4DQPSK SISO 2402 2DH5 1 1.159 / Pass 2441 2DH5 1 1.156 / Pass 2480 2DH5 1 1.157 / Pass 8DPSK SISO 2402 3DH5 1 1.163 / Pass 2441 3DH5 1 1.162 / Pass 2480 3DH5 1 1.162 / Pass 2.1.2 20dB BW Mode TX Type Frequency (MHz) Packet Type ANT 20dB Bandwidth (MHz) Verdict Result Limit GFSK SISO 2402 DH5 1 0.941 / Pass 2441 DH5 1 0.938 / Pass 2480 DH5 1 0.952 / Pass Pi/4DQPSK SISO 2402 2DH5 1 1.267 / Pass 2441 2DH5 1 1.267 / Pass 2480 2DH5 1 1.267 / Pass 8DPSK SISO 2402 3DH5 1 1.276 / Pass 2441 3DH5 1 1.260 / Pass 2480 3DH5 1 1.293 / Pass 9 2.2 Test Graph 2.2.1 OBW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 10 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV 11 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV 12 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV 13 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV 14 2.2.2 20dB BW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV 15 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV 16 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV 17 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV 18 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV 19 3. Maximum Conducted Output Power 3.1 Test Result 3.1.1 Power Left side: Mode TX Type Frequency (MHz) Packet Type Maximum Peak Conducted Output Power (dBm) Verdict ANT1 Limit GFSK SISO 2402 DH5 -1.39 <=30 Pass 2441 DH5 -1.46 <=30 Pass 2480 DH5 -1.18 <=30 Pass Pi/4DQPSK SISO 2402 2DH5 -0.63 <=20.97 Pass 2441 2DH5 -0.66 <=20.97 Pass 2480 2DH5 -0.36 <=20.97 Pass 8DPSK SISO 2402 3DH5 -0.22 <=20.97 Pass 2441 3DH5 -0.25 <=20.97 Pass 2480 3DH5 0.04 <=20.97 Pass Right side: Mode TX Type Frequency (MHz) Packet Type Maximum Peak Conducted Output Power (dBm) Verdict ANT1 Limit GFSK SISO 2402 DH5 -1.58 <=30 Pass 2441 DH5 -1.82 <=30 Pass 2480 DH5 -1.78 <=30 Pass Pi/4DQPSK SISO 2402 2DH5 -0.05 <=20.97 Pass 2441 2DH5 -0.16 <=20.97 Pass 2480 2DH5 -0.88 <=20.97 Pass 8DPSK SISO 2402 3DH5 -0.80 <=20.97 Pass 2441 3DH5 -0.51 <=20.97 Pass 2480 3DH5 -0.22 <=20.97 Pass 20 4. Carrier Frequency Separation 4.1 Test Result 4.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type Channel Separation (MHz) 20dB Bandwidth (MHz) Limit (MHz) Verdict GFSK SISO HOPP DH5 1.002 0.952 >=0.952 Pass Pi/4DQPSK SISO HOPP 2DH5 1.001 1.267 >=0.845 Pass 8DPSK SISO HOPP 3DH5 0.991 1.293 >=0.862 Pass 21 4.2 Test Graph 4.2.1 Ant1 GFSK_DH5_HOPP_Ant1_NTNV Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV 22 8DPSK_3DH5_HOPP_Ant1_NTNV 23 5. Number of Hopping Frequencies 5.1 Test Result 5.1.1 HoppNum Mode TX Type Frequency (MHz) Packet Type Num of Hopping Frequencies Verdict ANT1 Limit GFSK SISO HOPP DH5 79 >=15 Pass Pi/4DQPSK SISO HOPP 2DH5 79 >=15 Pass 8DPSK SISO HOPP 3DH5 79 >=15 Pass 24 5.2 Test Graph 5.2.1 HoppNum GFSK_DH5_HOPP_Ant1_NTNV Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV 25 8DPSK_3DH5_HOPP_Ant1_NTNV 26 6. Time of Occupancy (Dwell Time) 6.1 Test Result 6.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type Duration of Single Pulse (ms) Observation Period (s) Num of Pulse in Observation Period Dwell Time (ms) Limit (ms) Verdict GFSK SISO HOPP DH1 0.414 31.600 320 132.480 <=400 Pass DH3 1.670 31.600 150 250.500 <=400 Pass DH5 2.918 31.600 105 306.390 <=400 Pass Pi/4DQPSK SISO HOPP 2DH1 0.422 31.600 320 135.040 <=400 Pass 2DH3 1.676 31.600 161 269.836 <=400 Pass 2DH5 2.922 31.600 88 257.136 <=400 Pass 8DPSK SISO HOPP 3DH1 0.422 31.600 321 135.462 <=400 Pass 3DH3 1.676 31.600 150 251.400 <=400 Pass 3DH5 2.926 31.600 103 301.378 <=400 Pass 27 6.2 Test Graph 6.2.1 Ant1 GFSK_DH1_HOPP_Ant1_NTNV GFSK_DH1_HOPP_Ant1_NTNV 28 GFSK_DH3_HOPP_Ant1_NTNV GFSK_DH3_HOPP_Ant1_NTNV 29 GFSK_DH5_HOPP_Ant1_NTNV GFSK_DH5_HOPP_Ant1_NTNV 30 Pi/4DQPSK_2DH1_HOPP_Ant1_NTNV Pi/4DQPSK_2DH1_HOPP_Ant1_NTNV 31 Pi/4DQPSK_2DH3_HOPP_Ant1_NTNV Pi/4DQPSK_2DH3_HOPP_Ant1_NTNV 32 Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV Pi/4DQPSK_2DH5_HOPP_Ant1_NTNV 33 8DPSK_3DH1_HOPP_Ant1_NTNV 8DPSK_3DH1_HOPP_Ant1_NTNV 34 8DPSK_3DH3_HOPP_Ant1_NTNV 8DPSK_3DH3_HOPP_Ant1_NTNV 35 8DPSK_3DH5_HOPP_Ant1_NTNV 8DPSK_3DH5_HOPP_Ant1_NTNV 36 7. Unwanted Emissions In Non-restricted Frequency Bands 7.1 Test Result 7.1.1 Ref Mode TX Type Frequency (MHz) Packet Type ANT Level of Reference (dBm) GFSK SISO 2402 DH5 1 -1.80 2441 DH5 1 -1.84 2480 DH5 1 -1.54 HOPP DH5 1 -1.44 -1.44 Pi/4DQPSK SISO 2402 2DH5 1 -1.84 2441 2DH5 1 -1.84 2480 2DH5 1 -1.55 HOPP 2DH5 1 -1.49 -1.49 8DPSK SISO 2402 3DH5 1 -1.82 2441 3DH5 1 -1.81 2480 3DH5 1 -1.52 HOPP 3DH5 1 -1.37 -1.37 Note1: Refer to FCC Part 15.247 (d) and ANSI C63.10-2020, the channel contains the maximum PSD level was used to establish the reference level. 7.1.2 CSE Mode TX Type Frequency (MHz) Packet Type ANT Level of Reference (dBm) …

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Shenzhen HTT Technology Co., Ltd. Shenzhen HTT Technology Co.,Ltd. Tel: 0755-23595200 Fax: 0755-23595201 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong, China FCC PART 15 SUBPART C TEST REPORT FCC PART 15.247 Report Reference No. .................... : FCC ID. ........................................... : HTT202511277F01 2BRD9-M144 Compiled by ( position+printed name+signature) . : File administrators Supervised by ( position+printed name+signature) . : Project Engineer Approved by ( position+printed name+signature) . : RF Manager Date of issue .................................... : Nov. 18, 2025 Testing Laboratory Name .............. : Shenzhen HTT Technology Co.,Ltd. Address ............................................ : 1F, Building B, Huafeng International Robotics Industrial Park, Hangcheng Road,Nanchang Community, Xixiang Street, Bao’an District, Shenzhen, Guangdong, China Applicant’s name ........................... : YUEHANG INDUSTRIAL LIMITED Address ............................................ : RM 1904A19/F.LUCKY COMMERCIAL CENTRENO.103 DESVOEUX ROAD WEST, SHEUNG WAN Central and Western District, Hong Kong Island, Hong Kong,China Test specification ........................... : Standard ........................................... : FCC Part 15.247 Shenzhen HTT Technology Co.,Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HTT Technology Co.,Ltd. is acknowledged as copyright owner…

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