2BHGK-DM02True wireless headphones

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 5 EXTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 5 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 5 Fig.5 Fig.6 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 5 Fig.7 Fig.8 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 5 of 5 Fig.9 Fig.10

Label Location FCC ID: 2BHGK-DM02

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 4 INTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 4 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 4 Fig.5 Fig.6 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 4 Fig.7 Bluetooth Antenna Bluetooth Antenna

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 RADIO FREQUENCY EXPOSURE Limit According to section B.4 of 447498 D04 Interim General RF Exposure Guidance v01 SAR-based thresholds are derived based on frequency, power, and separation distance of the RF source. The formula defines the thresholds in general for either available maximum time-averaged power or maximum time-averaged ERP, whichever is greater. If the ERP of a device is not easily determined, such as for a portable device with a small form factor, the applicant may use the available maximum time-averaged power exclusively if the device antenna or radiating structure does not exceed an electrical length of λ/4. As for devices with antennas of length greater than λ/4 where the gain is not well defined, but always less than that of a half-wave dipole (length λ/2), the available maximum time-averaged power generated by the device may be used in place of the maximum time-averaged ERP, where that value is not known. The separation distance is the smallest distance from any part of the antenna or radiating structure for all persons, during operation at the applicable ERP. In the case of mobile or portable devices, the separation distance is from the outer housing of the device where it is closest to the antenna. The SAR-based exemption formula of § 1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2). Where and f is in GHz, d is the separation distance (cm), and ERP 20cm is per Formula (B.1). Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 3 The example values shown in Table B.2 are for illustration only. Frequency (MHz) Distance (mm) 5 10 15 20 25 30 35 40 45 50 300 39 65 88 110 129 148 166 184 201 217 450 22 44 67 89 112 135 158 180 203 226 835 9 25 44 66 90 116 145 175 207 240 1900 3 12 26 44 66 92 122 157 195 236 2450 3 10 22 38 59 83 111 143 179 219 3600 2 8 18 32 49 71 96 125 158 195 5800 1 6 14 25 40 58 80 106 136 169 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 3 Conducted Power Results Test Mode Antenna Frequency[MHz] Result[dBm] DH5 Ant1 2402 -2.59 DH5 Ant1 2441 -2.13 DH5 Ant1 2480 -2.02 2DH5 Ant1 2402 -2.03 2DH5 Ant1 2441 -1.62 2DH5 Ant1 2480 -1.65 3DH5 Ant1 2402 -1.77 3DH5 Ant1 2441 -1.11 3DH5 Ant1 2480 -1.30 Manufacturing tolerance GFSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -3.0 -2.5 -2.5 Tolerance ±(dB) 1 1 1 π/4-DQPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -2.5 -2 -2 Tolerance ±(dB) 1 1 1 8-DPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -2.5 -1.5 -2 Tolerance ±(dB) 1 1 1 Results Test Mode Max Conducted Tune Up Power(dBm) Max of ERP and Conducted Power including Tune Up (dBm) Max of ERP and Conducted Power including Tune Up (mW) Exemption Limit(mW) GFSK -1.5 -1.5 0.71 3 π/4-DQPSK -1 -1.0 0.79 3 8DPSK -0.5 -0.5 0.89 3 Max of ERP and Conducted Power including Tune Up (dBm) = Max Conducted Tune Up Power(dBm) and Max Conducted Tune Up Power(dBm) + Antenna Gain(dBi)-2.15), whichever is greater. The antenna gain of the EUT for BT is -0.68dBi (Max). the Maximum Eirp is used for Routine Evaluation Exemption according to B.4 of 447498 D04 Interim General RF Exposure Guidance v01. So, the SAR evaluation is not required.

Inverted F Antenna Specification Summary ITEM ANT SPEC 2.4G ANTModel Name Horizontal Vertical 2400MHz2400MHz 2400MHz2500MHz Center Frequency -1.73 -0.84 -0.68 -6.15 -3.70 -2.32 -0.68dBi MAX. Gain Polarization Horizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance 50 Ohm Antenna Length 4mm Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm) Horizontal: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -40 Scale: 5/div Frequency Gain(dBi) (MHz) Max Min Avg 2400 -1.73178 -30.0815 -8.48713 2450 -0.845801 -38.5605 -7.88012 2500 -0.685586 -24.0318 -6.79139 Vertical: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Frequency Gain(dBi) (MHz) Max Min Avg 2400 -6.1530 -24.1420 -13.0295 2450 -3.7054 -26.5836 -10.6700 2500 -2.32122 -30.4301 -9.70536 ANT Test Labs：Attestation of Global Compliance Co., Ltd.

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 1 of 47 Appendix Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: True wireless headphones Trade Mark: N/A Test Model: DM02 FCC ID: 2BHGK-DM02 Environmental Conditions Temperature: 23.8°C Relative Humidity: 58% ATM Pressure: 100.0 kPa Test Engineer: Allen Lai Supervised by: Hugo Chen NOTE N/A Appendix A: 20dB Emission Bandwidth Test Result TestMode Antenna Frequency[MHz] 20db EBW[MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.954 2401.556 2402.510 --- --- DH5 Ant1 2441 0.948 2440.559 2441.507 --- --- DH5 Ant1 2480 0.948 2479.556 2480.504 --- --- 2DH5 Ant1 2402 1.275 2401.388 2402.663 --- --- 2DH5 Ant1 2441 1.278 2440.385 2441.663 --- --- 2DH5 Ant1 2480 1.281 2479.388 2480.669 --- --- 3DH5 Ant1 2402 1.278 2401.373 2402.651 --- --- 3DH5 Ant1 2441 1.302 2440.376 2441.678 --- --- 3DH5 Ant1 2480 1.299 2479.370 2480.669 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 2 of 47 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 3 of 47 DH5-Ant1-2480 2DH5-Ant1-2402 2DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 4 of 47 2DH5-Ant1-2480 3DH5-Ant1-2402 3DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 5 of 47 3DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 6 of 47 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Frequency[MHz] OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.87633 2401.5809 2402.4572 --- --- DH5 Ant1 2441 0.86877 2440.5841 2441.4528 --- --- DH5 Ant1 2480 0.88488 2479.5796 2480.4645 --- --- 2DH5 Ant1 2402 1.1747 2401.4303 2402.6050 --- --- 2DH5 Ant1 2441 1.1790 2440.4294 2441.6084 --- --- 2DH5 Ant1 2480 1.1906 2479.4237 2480.6143 --- --- 3DH5 Ant1 2402 1.1975 2401.4192 2402.6167 --- --- 3DH5 Ant1 2441 1.1791 2440.4306 2441.6097 --- --- 3DH5 Ant1 2480 1.1904 2479.4242 2480.6146 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 7 of 47 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 8 of 47 DH5-Ant1-2480 2DH5-Ant1-2402 2DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 9 of 47 2DH5-Ant1-2480 3DH5-Ant1-2402 3DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 10 of 47 3DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 11 of 47 Appendix C: Maximum peak conducted output power Test Result Test Mode Antenna Frequency[MHz] Conducted Peak Power[dBm] Conducted Limit[dBm] Verdict DH5 Ant1 2402 -2.59 ≤30 PASS DH5 Ant1 2441 -2.13 ≤30 PASS DH5 Ant1 2480 -2.02 ≤30 PASS 2DH5 Ant1 2402 -2.03 ≤20.97 PASS 2DH5 Ant1 2441 -1.62 ≤20.97 PASS 2DH5 Ant1 2480 -1.65 ≤20.97 PASS 3DH5 Ant1 2402 -1.77 ≤20.97 PASS 3DH5 Ant1 2441 -1.11 ≤20.97 PASS 3DH5 Ant1 2480 -1.30 ≤20.97 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 12 of 47 Test Graphs DH5-Ant1-2402-PASS DH5-Ant1-2441-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 13 of 47 DH5-Ant1-2480-PASS 2DH5-Ant1-2402-PASS 2DH5-Ant1-2441-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 14 of 47 2DH5-Ant1-2480-PASS 3DH5-Ant1-2402-PASS 3DH5-Ant1-2441-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 15 of 47 3DH5-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 16 of 47 Appendix D: Carrier frequency separation Test Result TestMode Antenna Frequency[MHz] Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 0.97 ≥0.954 PASS 2DH5 Ant1 Hop 1.106 ≥0.854 PASS 3DH5 Ant1 Hop 1.21 ≥0.868 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 17 of 47 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 18 of 47 3DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 19 of 47 Appendix E: Time of occupancy Test Result TestMode Antenna Frequency[MHz] BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH5 Ant1 Hop 2.912 60 0.175 ≤0.4 PASS 2DH5 Ant1 Hop 2.917 80 0.233 ≤0.4 PASS 3DH5 Ant1 Hop 2.920 100 0.292 ≤0.4 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 20 of 47 Test Graphs DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 21 of 47 2DH5-Ant1-Hop-PASS 3DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 22 of 47 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 23 of 47 Appendix F: Number of hopping channels Test Result TestMode Antenna Frequency[MHz] Result[Num] Limit[Num] Verdict DH5 Ant1 Hop 79 ≥15 PASS 2DH5 Ant1 Hop 79 ≥15 PASS 3DH5 Ant1 Hop 79 ≥15 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 24 of 47 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 25 of 47 3DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 Report No.: TZ240706013-BT Page 26 of 47 Appendix G: Band edge measurements Test Result TestMode Antenna ChName Frequency[MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -3.57 -49.28 ≤-23.57 PASS DH5 Ant1 High 2480 -2.65 -49.04 ≤-22.65 PASS DH5 Ant1 Low Hop_2402 -4.32 -50.87 ≤-24.32 PASS DH5 Ant1 High Hop_2480 -2.76 -49.02 ≤-22.76 PASS 2DH5 Ant1 Low 2402 -4.21 -50.24 ≤-24.21 PASS 2DH5 Ant…

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FCC TEST REPORT Test report On Behalf of Shenzhen duomaite technology co., ltd For True wireless headphones Model No.: DM02, DM01 FCC ID: 2BHGK-DM02 Prepared for : Shenzhen duomaite technology co., ltd 10th Floor, Building A1, Zhongtai Information Technology Industrial Park, Shiyan Street, Baoan District, Shenzhen, China Prepared By : Shenzhen Tongzhou Testing Co., Ltd. 1st Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Date of Test: 2024/7/1 ~ 2024/7/7 Date of Report: 2024/8/16 Report Number: TZ240706013-BT The test report apply only to the specific sample(s) tested under stated test conditions It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: TZ240706013-BT Page 2 of 37 TEST RESULT CERTIFICATION Applicant’s name ................. : Shenzhen duomaite technology co., ltd Address .................................. : 10th Floor, Building A1, Zhongtai Information Technology Industrial Park, Shiyan Street, Baoan District, Shenzhen, China Manufacture's Name ............ : Shenzhen duomaite technology co., ltd Address .................................. : 10th Floor, Building A1, Zhongtai Information Technology Industrial Park, Shiyan Street, Baoan District, Shenzhen, China Product description Trade Mark ................................ : N/A Product name ............................ : True wireless headphones Model and/or type reference . : DM02, DM01 Standards ............................. : FCC Rules and Regulations Part 15 Subpart C Section 15.247 ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Tongzhou Testing Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen Tongzhou Testing 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. Date of Test ........................................... : Date (s) of performance of tests ............. : 2024/7/1 ~ 2024/7/7 Date of Issue .......................................... : 2024/8/16 Test Result .............................................. : Pass Testing Engineer : (Allen Lai) Technical Manager : (Hugo Chen) Authorized Signatory : (Andy Zhang) Report No.: TZ240706013-BT Page 3 of 37 Revision History Revision Issue Date Revisions Revised By 00 2024/8/16 Initial Issue Andy Zhang Report No.: TZ240706013-BT Page 4 of 37 TABLE OF CONTENTS 1 GENERAL INFORMATION ................................................................................................ 5 1.1 Description of Device (EUT) ................................................................................................... 5 1.2 Wireless Function Tested in this Report ................................................................................. 5 1.3 EUT configuration ................................................................................................................... 6 1.4 Description of Test Facility ...................................................................................................... 6 1.5 Statement of the Measurement Uncertainty ............................................................................ 6 1.6 Measurement Uncertainty ....................................................................................................... 7 1.7 Description of Test Modes ...................................................................................................... 7 1.8 Frequency of Channels........................................................................................................... 7 2 TEST METHODOLOGY ..................................................................................................... 8 2.1 EUT Configuration .................................................................................................................. 8 2.2 EUT Exercise ......................................................................................................................... 8 2.3 Test Sample ........................................................................................................................... 8 3 SYSTEM TEST CONFIGURATION .................................................................................... 9 3.1 Justification ............................................................................................................................. 9 3.2 EUT Exercise Software........................................................................................................... 9 3.3 Special Accessories ............................................................................................................... 9 3.4 Block Diagram/Schematics ..................................................................................................... 9 3.5 Equipment Modifications ......................................................................................................... 9 3.6 Test Setup .............................................................................................................................. 9 4 SUMMARY OF TEST RESULTS ...................................................................................... 10 5 MEASUREMENT RESULTS ............................................................................................ 11 5.1 Maximum Peak Conducted Output Power ............................................................................ 11 5.2 Frequency Separation and 20 dB Bandwidth ........................................................................ 12 5.3 Number of Hopping Frequency ............................................................................................. 13 5.4 Time of Occupancy (Dwell Time) .......................................................................................... 14 5.5 Cond…

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Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 2 TEST SETUP PHOTOS OF THE EUT Conducted Emission Radiated Emission Below 1GHz Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHGK-DM02 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 2 Radiated Emission Above 1GHz