2BTVI-HJ-26True Wireless Stereo

FCC ID LABEL: Ca. 5mm x 2mm Label Location 、 FCC ID: 2BTVI‐HJ‐26

FCC RF Exposure EUT Description: True Wireless Stereo Model No.: HJ-26 FCC ID: 2BTVI-HJ-26 1. Limits According to KDB 447498 D01 General RF Exposure Guidance v06 The 1‐g and 10‐g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤50 mm are determined by: [(max power of channel, including tune‐up tolerance, mW)/(min. test separation distance, mm)]ꞏ[√f(GHz)]≤3.0 for 1‐g SAR and ≤ 7.5 for 10‐g extremity SAR, Where: Result=P/D*√F F= the RF channel transmit frequency in GHz P=Maximum turn‐up power in mw D=Min. test separation distance in mm 2. Test Result of RF Exposure Evaluation Frequency (MHz) Output power (dBm) Tune Up Power (dBm) Max Tune Up power (mW) Min test separati on distance mm Result Limit SAR Test Exclusion L 2480 3.64 3±1(4) 2.512 5 0.791 3.0 Pass R 2480 2.69 2±1(3) 1.995 5 0.628 3.0 Pass Note: PK Output power= conducted power. Conducted power see the test report HK2512186585-1E/2E, antenna gain=2.5dBi Per KDB 447498 D01, when the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. The test exclusion threshold is 0.791 which is<= 3, SAR testing is not required. Note: Exclusion Thresholds Results=[(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ꞏ[√f(GHz)] f(GHz) is the RF channel transmit frequency in GHz Distance=5mm

Page 1 of 50 Report No.: HK2512186585-1E FCC Test Report Test Report On Behalf of Shenzhen Nuoyin Technology Co., Ltd. For True Wireless Stereo Model No.: HJ-26 FCC ID: 2BTVI-HJ-26 Prepared For: Shenzhen Nuoyin Technology Co., Ltd. A302, Wanzhongcheng Clothing Wholesale Market, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, China Prepared By: Shenzhen HUAK Testing Technology Co., Ltd. 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Date of Test: Dec. 18, 2025 ~ Jan. 04, 2026 Date of Report: Jan. 04, 2026 Report Number: HK2512186585-1E Page 2 of 50 Report No.: HK2512186585-1E Test Result Certification Applicant’s Name .................. : Shenzhen Nuoyin Technology Co., Ltd. Address .................................. : A302, Wanzhongcheng Clothing Wholesale Market, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, China Manufacturer's Name ........... : Shenzhen Nuoyin Technology Co., Ltd. Address .................................. : A302, Wanzhongcheng Clothing Wholesale Market, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, China Product Description Trade Mark ............................. : N/A Product Name ......................... : True Wireless Stereo Model and/or Type Reference : HJ-26 Standards .............................. : 47 CFR FCC Part 15 Subpart C 15.247 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing 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. Date of Test ............................................ : Date (s) of Performance of Tests ............ : Dec. 18, 2025 ~ Jan. 04, 2026 Date of Issue ........................................... : Jan. 04, 2026 Test Result ............................................... : Pass Testing Engineer Len Liao Technical Manager Sliver Wan Authorized Signatory Jason Zhou Page 3 of 50 Report No.: HK2512186585-1E Table of Contents Page 1. Summary ................................................................................................... 5 1.1 Test Standards ............................................................................................................ 5 1.2 Test Procedures and Results ...................................................................................... 5 1.3 Information of the Test Laboratory .............................................................................. 6 1.4 Statement of the Measurement Uncertainty ................................................................ 6 2. General Information ................................................................................. 7 2.1 Environmental Conditions ........................................................................................... 7 2.2 General Description of EUT ........................................................................................ 7 2.3 Description of Test Modes and Test Frequency .......................................................... 8 2.4 Equipments Used during the Test ............................................................................... 9 2.5 Related Submittal(s) / Grant (s) ................................................................................ 10 2.6 Modifications ............................................................................................................. 10 2.7 Description of Test Setup .......................................................................................... 10 2.8 Description of Support Units ..................................................................................... 11 3. Test Conditions and Results ................................................................. 12 3.1 AC Conducted Emissions Test .................................................................................. 12 3.2 Radiated Emissions .................................................................................................. 15 3.3 Maximum Peak Conducted Output Power ................................................................ 23 3.4 20dB Bandwidth ........................................................................................................ 24 3.5 Frequency Separation .............................................................................................. 28 3.6 Number of Hopping Frequency ................................................................................. 30 3.7 Time of Occupancy (Dwell Time) .............................................................................. 32 3.8 Out-of-Band Emissions ............................................................................................. 36 3.9 Pseudorandom Frequency Hopping Sequence ........................................................ 46 3.10 Antenna Requirement ........................................................................................... 47 4. Test Setup Photos of the EUT ............................................................... 48 5. Photos of the EUT .................................................................................. 50 Page 4 of 50 Report No.: HK2512186585-1E ** Issued history ** Revision Description Issued Date Remark Revision 1.0 Initial Test Report Release Jan. 04, 2026 Jason Zhou Page 5 of 50 Report No.: HK2512186585-1E 1. Summary 1.1 Test Standards The tests were performed according to following standards: FCC Rules Part 15.247: Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz ANSI C63.10: 2020: American National Standard for Testing Unlicensed Wireless Devices 1.2 Test Procedur…

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Page 26 of 50 Report No.: HK2512186585-1E π/4DQPSK Modulation CH00 CH39 CH78 Page 27 of 50 Report No.: HK2512186585-1E 8DPSK Modulation CH00 CH39 CH78 Page 28 of 50 Report No.: HK2512186585-1E 3.5 Frequency Separation Limit Frequency hopping systems shall have hopping channel carrier frequencies separated by minimum of 25 KHz or the 2/3*20dB bandwidth of the hopping channel, whichever is greater. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. The bandwidth of the fundamental frequency was measured by spectrum analyzer with 300 KHz RBW and 1000 KHz VBW. Test Configuration EUT SPECTRUM ANALYZER Test Results Modulation Channel Channel Separation (MHz) Limit(MHz) Result GFSK CH39 0.994 0.640 Pass CH40 π/4DQPSK CH39 0.996 0.906 Pass CH40 8DPSK CH39 0.998 0.842 Pass CH40 Note: We have tested all mode at high, middle and low channel, and recorded worst case at middle Page 29 of 50 Report No.: HK2512186585-1E Test plot as follows: Frequency Separation GFSK π/4DQPSK 8DPSK Page 30 of 50 Report No.: HK2512186585-1E 3.6 Number of Hopping Frequency Limit Frequency hopping systems in the 2400–2483.5 MHz band shall use at least 15 channels. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. Set spectrum analyzer start 2400MHz to 2483.5MHz. Test Configuration EUT SPECTRUM ANALYZER Test Results Modulation Number of Hopping Channel Limit Result GFSK 79 ≥15 Pass π/4DQPSK 79 8DPSK 79 Test plot as follows: Page 31 of 50 Report No.: HK2512186585-1E GFSK Modulation π/4DQPSK Modulation 8DPSK Modulation Page 32 of 50 Report No.: HK2512186585-1E 3.7 Time of Occupancy (Dwell Time) Limit The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. Set center frequency of spectrum analyzer=operating frequency with 1MHz RBW and 3MHz VBW, Span 0Hz. Test Configuration EUT SPECTRUM ANALYZER Test Results Modulation Packet Pulse time (ms) Number of transmission in 31.6s (79 Hopping*0.4)= Burst Count Dwell time (second) Limit (second) Result GFSK DH1 0.405 32 (pulses) *10 = 320 0.130 0.40 PASS DH3 1.662 15 (pulses) *10 = 150 0.249 DH5 2.910 11 (pulses) *10 = 110 0.320 π/4DQPSK 2-DH1 0.414 31 (pulses) *10 = 310 0.128 0.40 PASS 2-DH3 1.667 15 (pulses) *10 = 150 0.250 2-DH5 2.915 11 (pulses) *10 = 110 0.321 8DPSK 3-DH1 0.417 31 (pulses) *10 = 310 0.129 0.40 PASS 3-DH3 1.667 14 (pulses) *10 = 140 0.233 3-DH5 2.918 11 (pulses) *10 = 110 0.321 Note: 1. We have tested all mode at high,middle and low channel,and recoreded worst case at middle channel. 2. Dwell time =[Pulse time (ms) /1000] x Burst Count Test plot as follows: Page 33 of 50 Report No.: HK2512186585-1E GFSK Modulation DH1 DH3 DH5 Page 34 of 50 Report No.: HK2512186585-1E π/4DQPSK Modulation 2-DH1 2-DH3 2-DH5 Page 35 of 50 Report No.: HK2512186585-1E 8DPSK Modulation 3-DH1 3-DH3 3-DH5 Page 36 of 50 Report No.: HK2512186585-1E 3.8 Out-of-Band Emissions Limit In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or digitally modulated intentional radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desired power, based on either an RF con-ducted or a radiated measurement, pro-vided the transmitter demonstrates compliance with the peak conducted power limits. If the transmitter com-plies with the conducted power limits based on the use of RMS averaging over a time interval, as permitted under paragraph (b)(3) of this section, the attenuation required under this paragraph shall be 30 dB instead of 20 dB. Attenuation below the general limits specified in §15.209(a) is not required. Test Procedure Connect the transmitter output to spectrum analyzer using a low loss RF cable, and set the spectrum analyzer to RBW=100 kHz, VBW= 300 kHz, peak detector , and max hold. Measurements utilizing these setting are made of the in-band reference level, band edge and out-of-band emissions. Test Configuration EUT SPECTRUM ANALYZER Test Results Remark: The measurement frequency range is from 30MHz to the 10th harmonic of the fundamental frequency. The lowest, middle and highest channels are tested to verify the spurious emissions and bandage measurement data. We measured all conditions (DH1, DH3, DH5) and recorded worst case at DH5 and 3DH5 Test plot as follows: Page 37 of 50 Report No.: HK2512186585-1E GFSK CH00 CH39 Page 38 of 50 Report No.: HK2512186585-1E CH78 Page 39 of 50 Report No.: HK2512186585-1E Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on Page 40 of 50 Report No.: HK2512186585-1E π/4DQPSK CH00 CH39 Page 41 of 50 Report No.: HK2512186585-1E CH78 Page 42 of 50 Report No.: HK2512186585-1E Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on Page 43 of 50 Report No.: HK2512186585-1E 8DPSK CH00 CH39 Page 44 of 50 Report No.: HK2512186585-1E CH78 Page 45 of 50 Report No.: HK2512186585-1E Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on Page 46 of 50 Report No.: HK2512186585-1E 3.9 Pseudorandom Frequency Hopping Sequence Test Applicable For 47 CFR Part 15C section 15.247 (a) (1): Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hop-ping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400–2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no grea…

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Page 1 of 50 Report No.: HK2512186585-2E FCC Test Report Test Report On Behalf of Shenzhen Nuoyin Technology Co., Ltd. For True Wireless Stereo Model No.: HJ-26 FCC ID: 2BTVI-HJ-26 Prepared For: Shenzhen Nuoyin Technology Co., Ltd. A302, Wanzhongcheng Clothing Wholesale Market, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, China Prepared By: Shenzhen HUAK Testing Technology Co., Ltd. 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Date of Test: Dec. 18, 2025 ~ Jan. 04, 2026 Date of Report: Jan. 04, 2026 Report Number: HK2512186585-2E Page 2 of 50 Report No.: HK2512186585-2E Test Result Certification Applicant’s Name .................. : Shenzhen Nuoyin Technology Co., Ltd. Address .................................. : A302, Wanzhongcheng Clothing Wholesale Market, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, China Manufacturer's Name ........... : Shenzhen Nuoyin Technology Co., Ltd. Address .................................. : A302, Wanzhongcheng Clothing Wholesale Market, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, China Product Description Trade Mark ............................. : N/A Product Name ......................... : True Wireless Stereo Model and/or Type Reference : HJ-26 Standards .............................. : 47 CFR FCC Part 15 Subpart C 15.247 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing 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. Date of Test ............................................ : Date (s) of Performance of Tests ............ : Dec. 18, 2025 ~ Jan. 04, 2026 Date of Issue ........................................... : Jan. 04, 2026 Test Result ............................................... : Pass Testing Engineer Len Liao Technical Manager Sliver Wan Authorized Signatory Jason Zhou Page 3 of 50 Report No.: HK2512186585-2E Table of Contents Page 1. Summary ................................................................................................... 5 1.1 Test Standards ............................................................................................................ 5 1.2 Test Procedures and Results ...................................................................................... 5 1.3 Information of the Test Laboratory .............................................................................. 6 1.4 Statement of the Measurement Uncertainty ................................................................ 6 2. General Information ................................................................................. 7 2.1 Environmental Conditions ........................................................................................... 7 2.2 General Description of EUT ........................................................................................ 7 2.3 Description of Test Modes and Test Frequency .......................................................... 8 2.4 Equipments Used during the Test ............................................................................... 9 2.5 Related Submittal(s) / Grant (s) ................................................................................ 10 2.6 Modifications ............................................................................................................. 10 2.7 Description of Test Setup .......................................................................................... 10 2.8 Description of Support Units ..................................................................................... 11 3. Test Conditions and Results ................................................................. 12 3.1 AC Conducted Emissions Test .................................................................................. 12 3.2 Radiated Emissions .................................................................................................. 15 3.3 Maximum Peak Conducted Output Power ................................................................ 23 3.4 20dB Bandwidth ........................................................................................................ 24 3.5 Frequency Separation .............................................................................................. 28 3.6 Number of Hopping Frequency ................................................................................. 30 3.7 Time of Occupancy (Dwell Time) .............................................................................. 32 3.8 Out-of-Band Emissions ............................................................................................. 36 3.9 Pseudorandom Frequency Hopping Sequence ........................................................ 46 3.10 Antenna Requirement ........................................................................................... 47 4. Test Setup Photos of the EUT ............................................................... 48 5. Photos of the EUT .................................................................................. 50 Page 4 of 50 Report No.: HK2512186585-2E ** Issued history ** Revision Description Issued Date Remark Revision 1.0 Initial Test Report Release Jan. 04, 2026 Jason Zhou Page 5 of 50 Report No.: HK2512186585-2E 1. Summary 1.1 Test Standards The tests were performed according to following standards: FCC Rules Part 15.247: Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz ANSI C63.10: 2020: American National Standard for Testing Unlicensed Wireless Devices 1.2 Test Procedur…

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Page 26 of 50 Report No.: HK2512186585-2E π/4DQPSK Modulation CH00 CH39 CH78 Page 27 of 50 Report No.: HK2512186585-2E 8DPSK Modulation CH00 CH39 CH78 Page 28 of 50 Report No.: HK2512186585-2E 3.5 Frequency Separation Limit Frequency hopping systems shall have hopping channel carrier frequencies separated by minimum of 25 KHz or the 2/3*20dB bandwidth of the hopping channel, whichever is greater. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. The bandwidth of the fundamental frequency was measured by spectrum analyzer with 300 KHz RBW and 1000 KHz VBW. Test Configuration EUT SPECTRUM ANALYZER Test Results Modulation Channel Channel Separation (MHz) Limit(MHz) Result GFSK CH39 0.994 0.638 Pass CH40 π/4DQPSK CH39 0.996 0.850 Pass CH40 8DPSK CH39 0.998 0.840 Pass CH40 Note: We have tested all mode at high, middle and low channel, and recorded worst case at middle Page 29 of 50 Report No.: HK2512186585-2E Test plot as follows: Frequency Separation GFSK π/4DQPSK 8DPSK Page 30 of 50 Report No.: HK2512186585-2E 3.6 Number of Hopping Frequency Limit Frequency hopping systems in the 2400–2483.5 MHz band shall use at least 15 channels. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. Set spectrum analyzer start 2400MHz to 2483.5MHz. Test Configuration EUT SPECTRUM ANALYZER Test Results Modulation Number of Hopping Channel Limit Result GFSK 79 ≥15 Pass π/4DQPSK 79 8DPSK 79 Test plot as follows: Page 31 of 50 Report No.: HK2512186585-2E GFSK Modulation π/4DQPSK Modulation 8DPSK Modulation Page 32 of 50 Report No.: HK2512186585-2E 3.7 Time of Occupancy (Dwell Time) Limit The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Test Procedure The transmitter output was connected to the spectrum analyzer through an attenuator. Set center frequency of spectrum analyzer=operating frequency with 1MHz RBW and 3MHz VBW, Span 0Hz. Test Configuration EUT SPECTRUM ANALYZER Test Results Modulation Packet Pulse time (ms) Number of transmission in 31.6s (79 Hopping*0.4)= Burst Count Dwell time (second) Limit (second) Result GFSK DH1 0.405 32 (pulses) *10 = 320 0.130 0.40 PASS DH3 1.662 15 (pulses) *10 = 150 0.249 DH5 2.908 11 (pulses) *10 = 110 0.320 π/4DQPSK 2-DH1 0.414 31 (pulses) *10 = 310 0.128 0.40 PASS 2-DH3 1.667 18 (pulses) *10 = 180 0.300 2-DH5 2.915 11 (pulses) *10 = 110 0.321 8DPSK 3-DH1 0.417 32 (pulses) *10 = 320 0.133 0.40 PASS 3-DH3 1.667 15 (pulses) *10 = 150 0.250 3-DH5 2.918 12 (pulses) *10 = 120 0.350 Note: 1. We have tested all mode at high,middle and low channel,and recoreded worst case at middle channel. 2. Dwell time =[Pulse time (ms) /1000] x Burst Count Test plot as follows: Page 33 of 50 Report No.: HK2512186585-2E GFSK Modulation DH1 DH3 DH5 Page 34 of 50 Report No.: HK2512186585-2E π/4DQPSK Modulation 2-DH1 2-DH3 2-DH5 Page 35 of 50 Report No.: HK2512186585-2E 8DPSK Modulation 3-DH1 3-DH3 3-DH5 Page 36 of 50 Report No.: HK2512186585-2E 3.8 Out-of-Band Emissions Limit In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or digitally modulated intentional radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desired power, based on either an RF con-ducted or a radiated measurement, pro-vided the transmitter demonstrates compliance with the peak conducted power limits. If the transmitter com-plies with the conducted power limits based on the use of RMS averaging over a time interval, as permitted under paragraph (b)(3) of this section, the attenuation required under this paragraph shall be 30 dB instead of 20 dB. Attenuation below the general limits specified in §15.209(a) is not required. Test Procedure Connect the transmitter output to spectrum analyzer using a low loss RF cable, and set the spectrum analyzer to RBW=100 kHz, VBW= 300 kHz, peak detector , and max hold. Measurements utilizing these setting are made of the in-band reference level, band edge and out-of-band emissions. Test Configuration EUT SPECTRUM ANALYZER Test Results Remark: The measurement frequency range is from 30MHz to the 10th harmonic of the fundamental frequency. The lowest, middle and highest channels are tested to verify the spurious emissions and bandage measurement data. We measured all conditions (DH1, DH3, DH5) and recorded worst case at DH5 and 3DH5 Test plot as follows: Page 37 of 50 Report No.: HK2512186585-2E GFSK CH00 CH39 Page 38 of 50 Report No.: HK2512186585-2E CH78 Page 39 of 50 Report No.: HK2512186585-2E Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on Page 40 of 50 Report No.: HK2512186585-2E π/4DQPSK CH00 CH39 Page 41 of 50 Report No.: HK2512186585-2E CH78 Page 42 of 50 Report No.: HK2512186585-2E Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on Page 43 of 50 Report No.: HK2512186585-2E 8DPSK CH00 CH39 Page 44 of 50 Report No.: HK2512186585-2E CH78 Page 45 of 50 Report No.: HK2512186585-2E Left Band edge hoping off Right Band edge hoping off Left Band edge hoping on Right Band edge hoping on Page 46 of 50 Report No.: HK2512186585-2E 3.9 Pseudorandom Frequency Hopping Sequence Test Applicable For 47 CFR Part 15C section 15.247 (a) (1): Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hop-ping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400–2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no grea…

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Test Model：HJ-26 L: Radiated Emission AC Conducted Emission RF Conducted Emission

Test Model：HJ-26 R: Radiated Emission AC Conducted Emission RF Conducted Emission