2BHTD-E01vacuum tube audio headphone

vacuum tube audio headphones USER MANUAL Headphones manual_Final_Booklet.indd 16/13/24 8:24AM POWER ON Press and hold the power button until you hear the prompt “power on” and the indicator light begins to flash. The vacuum tube will glow when the headset is powered on. (except when in noise control, wired USBC or AUX modes). POWER OFF GETTING STARTED POWER BUTTON MULTIFUNCTION BUTTON NOISE CONTROL BUTTON INDICATOR LIGHT USBC PORT 3.5mm AUX PORT VACUUM TUBE WINDOW AUDIO CONTROLS PAUSE AND RESUME PLAY Press the multifunction button once to pause play and again to resume. SMART VOICE ASSISTANT Press the multifunction button three times to activate the smart voice assistant of the connected mobile phone or tablet. The volume and track navigation controls are located on the right (logo) side earcup. Clicking up and down controls the volume. Clicking front and back advances the tracks forward or backward. VOLUME DOWN VOLUME UP NEXT TRACKPREVIOUS TRACK + – Headphones manual_Final_Booklet.indd 2-36/13/24 8:24AM WIRED LISTENING When the headset is connected to an audio source via cable, Bluetooth will disconnect. Upon unplugging the audio cable, the headphones will automatically reconnect to the previously paired Bluetooth device. ANALOG AUDIO VIA 3.5mm AUX CABLE Powered: When connected to an audio source via a 3.5mm audio cable while the headset is powered on, the volume control, noise control modes, the built-in vacuum tube preamp and amplifier remain active. Passive: audio signal is directly transmitted to the speakers and volume is controlled by the audio source. (All headset controls, noise control modes and amplification are inactive.) DIGITAL AUDIO VIA USBC CABLE écoute headphones will power on automatically when connected to a computer or digital audio source via the USBC port. Volume control, noise control modes, the built-in vacuum tube preamp and amplifier are active. Note: If sound is not automatically available on your headset upon connecting the USBC cable, you may need to select “écoute audio” in the sound output settings of your computer/digital audio source. WIRELESS LISTENING BLUETOOTH PAIRING Step 1: Enable the Bluetooth function on your mobile device, tablet, PC or TV. Step 2: Power on the headset. Step 3: Press and hold the multifuction button for three seconds. The indicator light will flash rapidly and you will hear the prompt “pairing.” Step 4: Select “écoute” on your audio source’s Bluetooth menu. Once connected successfully, you will hear the prompt “écoute paired.” The indicator light is established. If the Bluetooth connection fails, you will hear the prompt “Bluetooth disconnected.” Return to step 3 to re-establish the Bluetooth connection. Note: The headset will attempt to pair for five minutes. If pairing fails, the headset BLUETOOTH RECONNECTION Your headset will automatically reconnect with the last device to which it was paired when it is powered on. The prompt “écoute paired” will play once the reconnection is established. CLEARING THE PAIRED DEVICE RECORD (FACTORY RESET) Simultaneously press the multifuction and noise control buttons for ten seconds. The indicator light will flash three times, indicating the paired device records have been successfully cleared. You will hear the prompt “pairing” indicating that the headset has entered pairing mode. Headphones manual_Final_Booklet.indd 4-56/13/24 8:24AM Your headset can be used to take calls when connected to a telephone via Bluetooth or USBC cable. ANSWER AN INCOMING CALL Press the multifunction button once to answer an incoming call. END A CALL Press the multifunction button once to end a call. DECLINE AN INCOMING CALL Press and hold the multifunction button to decline an incoming call. NOISE CONTROL MODES TRANSPARENCY Transparency mode allows you to hear ambient sounds while wearing the headset to be more aware of your environment. ANC (Active Noise Cancellation) ANC mode cancels ambient sounds. TURNING NOISE CONTROL ON AND OFF With the headset powered on, press the noise control button to switch between modes. A voice prompt will announce the current mode. Press the button once for transparency mode, twice to turn noise cancellation on and three times to TELEPHONY CHARGING This headset has a built-in rechargeable battery. When the battery is low, the indicator light will flash red and you will hear the prompt sound “battery charge is low.” If you’re using a compatible iOS or Android device, the device will display the battery status. To recharge the battery, co nnect the headset to a 5 V charger or power source such as a computer via the included USBC cable. The indicator light will glow red while Note: The headset cannot be turned on while connected to a 5 V charger. Avoid listening to music at excessively high volumes. Listening at or below 60% of maximum volume levels during regular use is recommended. To clean, use a soft damp cloth to wipe the surface of the headset. Do not use excessive moisture or chemical cleaners. Ensure that the headphones are completely dry before powering on. Prevent the headphones from being subjected to strong impacts to avoid damaging the internal components. Do not expose the headset to moist environments. Do not leave the headset in direct sunlight or expose them to high temperatures. Do not disassemble the headset or attempt to replace the battery. Doing so will void the warranty. Contact écoute audio or an authorized service agent for repairs or to replace the battery. Do not charge using a charger or power source that is greater than 5 volts. PRECAUTIONS Headphones manual_Final_Booklet.indd 6-76/13/24 8:24AM ecouteaudio.com Headphones manual_Final_Booklet.indd 86/13/24 8:24AM This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications…

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Ecoute Audio Inc. 125 S. King, Street, PO Box 2922, Jackson, Wyoming, 83001, United States Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 8/5/2024 U.S. Agent Designation Ecoute Audio Inc. acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought (FCC ID: 2BHTD-E01): Name and company of U.S. agent: Ecoute Audio Inc. Physical U.S. address of agent: 125 S. King, Street, PO Box 2922, Jackson, Wyoming, 83001, United States FRN of U.S. agent: 0035723626 Email address of U.S. agent: [email protected] Ecoute Audio Inc. acknowledges their obligation to accept service of process on behalf of Ecoute Audio Inc.. Ecoute Audio Inc. with the FRN 0035723626 accepts its obligation to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. Sincerely, Signature QiQi Ye Project Manager Ecoute Audio Inc. Signature QiQi Ye Project Manager Ecoute Audio Inc. 48_[mo del] US_Agent_2.911(d)(7) - U, V0 5

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 EXTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 3 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 3 Fig.5 Fig.6

Label Location FCC ID: 2BHTD-E01

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 5 INTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 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: 2BHTD-E01 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 Bluetooth Antenna Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 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: 2BHTD-E01 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

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 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: 2BHTD-E01 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: 2BHTD-E01 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 -8.81 DH5 Ant1 2441 -7.90 DH5 Ant1 2480 -7.24 2DH5 Ant1 2402 -7.98 2DH5 Ant1 2441 -7.07 2DH5 Ant1 2480 -6.66 3DH5 Ant1 2402 -7.76 3DH5 Ant1 2441 -6.80 3DH5 Ant1 2480 -6.15 Manufacturing tolerance GFSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -9.5 -8.5 -7.5 Tolerance ±(dB) 1 1 1 π/4-DQPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -8.5 -7.5 -7 Tolerance ±(dB) 1 1 1 8-DPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -8.5 -7.5 -6.5 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 -6.5 -6.5 0.22 3 π/4-DQPSK -6 -6.0 0.25 3 8DPSK -5.5 -5.5 0.28 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 0.98dBi (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.

Summary Inverted F Antenna (MIFA) Specification ITEM ANT SPEC Model Name 2.4G ANT Center Frequency Horizontal Vertical 2400MHz 2440MHz 2500MHz 2400MHz 2440MHz 2500MHz 0.09 0.98 -0.28 -0.25 -0.46 -0.86 MAX. Gain 0.98dbi Polarization Horizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance 50 Ohm Antenna Length 48.20mm Manufacture SHENZHEN AKAUDIO TECHNOLOGY CO.,LTD Antenna Photo & Length (mils) Light Blue: Bottom Layer All dimension are in mils 天线的S11图： Marker(MHZ) 2400 2450 2500 Returnloss -5.9 -14.5 -6.5 VSWR 2.9 1.4 2.7 增益、效率及辐射方向图 频率 （MHz） 2400 2410 2420 2430 2440 2450 2460 2470 2480 2490 2500 Gain（dBi） 0.09 0.39 0.65 0.88 0.98 0.95 0.73 0.50 0.16 -0.08 -0.28 Efficien （%） 23.9 25.2 26.1 26.9 27.2 27.3 26.3 24.3 22.4 20.4 19.4 2450MHz方向图：

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 1 of 46 Appendix Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: vacuum tube audio headphone Trade Mark: écoute Test Model: e01 FCC ID: 2BHTD-E01 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 0.921 2401.541 2402.462 --- --- DH5 Ant1 2441 0.981 2440.493 2441.474 --- --- DH5 Ant1 2480 1.011 2479.466 2480.477 --- --- 2DH5 Ant1 2402 1.227 2401.367 2402.594 --- --- 2DH5 Ant1 2441 1.209 2440.388 2441.597 --- --- 2DH5 Ant1 2480 1.233 2479.364 2480.597 --- --- 3DH5 Ant1 2402 1.278 2401.355 2402.633 --- --- 3DH5 Ant1 2441 1.191 2440.412 2441.603 --- --- 3DH5 Ant1 2480 1.197 2479.400 2480.597 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 2 of 46 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 3 of 46 DH5-Ant1-2480 2DH5-Ant1-2402 2DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 4 of 46 2DH5-Ant1-2480 3DH5-Ant1-2402 3DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 5 of 46 3DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 6 of 46 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Frequency[MHz] OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.93686 2401.5288 2402.4657 --- --- DH5 Ant1 2441 0.98346 2440.4993 2441.4827 --- --- DH5 Ant1 2480 1.0014 2479.5008 2480.5022 --- --- 2DH5 Ant1 2402 1.1394 2401.4239 2402.5633 --- --- 2DH5 Ant1 2441 1.1576 2440.4129 2441.5705 --- --- 2DH5 Ant1 2480 1.1691 2479.4063 2480.5754 --- --- 3DH5 Ant1 2402 1.1518 2401.4221 2402.5739 --- --- 3DH5 Ant1 2441 1.1718 2440.4088 2441.5806 --- --- 3DH5 Ant1 2480 1.1612 2479.4172 2480.5784 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 7 of 46 Test Graphs DH5-Ant1-2402 DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 8 of 46 DH5-Ant1-2480 2DH5-Ant1-2402 2DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 9 of 46 2DH5-Ant1-2480 3DH5-Ant1-2402 3DH5-Ant1-2441 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 10 of 46 3DH5-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 11 of 46 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 -8.81 ≤30 PASS DH5 Ant1 2441 -7.90 ≤30 PASS DH5 Ant1 2480 -7.24 ≤30 PASS 2DH5 Ant1 2402 -7.98 ≤20.97 PASS 2DH5 Ant1 2441 -7.07 ≤20.97 PASS 2DH5 Ant1 2480 -6.66 ≤20.97 PASS 3DH5 Ant1 2402 -7.76 ≤30 PASS 3DH5 Ant1 2441 -6.80 ≤30 PASS 3DH5 Ant1 2480 -6.15 ≤30 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 12 of 46 Test Graphs DH5-Ant1-2402-PASS DH5-Ant1-2441-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 13 of 46 DH5-Ant1-2480-PASS 2DH5-Ant1-2402-PASS 2DH5-Ant1-2441-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 14 of 46 2DH5-Ant1-2480-PASS 3DH5-Ant1-2402-PASS 3DH5-Ant1-2441-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 15 of 46 3DH5-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 16 of 46 Appendix D: Carrier frequency separation Test Result TestMode Antenna Frequency[MHz] Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 1.316 ≥1.011 PASS 2DH5 Ant1 Hop 1.002 ≥0.822 PASS 3DH5 Ant1 Hop 1.324 ≥1.278 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 17 of 46 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 18 of 46 3DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 19 of 46 Appendix E: Time of occupancy Test Result TestMode Antenna Frequency[MHz] BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH5 Ant1 Hop 2.889 80 0.231 ≤0.4 PASS 2DH5 Ant1 Hop 2.894 110 0.318 ≤0.4 PASS 3DH5 Ant1 Hop 2.894 90 0.26 ≤0.4 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 20 of 46 Test Graphs DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 21 of 46 2DH5-Ant1-Hop-PASS 3DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 22 of 46 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: 2BHTD-E01 Report No.: TZ240706097-BT Page 23 of 46 Test Graphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 24 of 46 3DH5-Ant1-Hop-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 Report No.: TZ240706097-BT Page 25 of 46 Appendix G: Band edge measurements Test Result TestMode Antenna ChName Frequency[MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -15.12 -50.42 ≤-35.12 PASS DH5 Ant1 High 2480 -15.91 -49.55 ≤-35.91 PASS DH5 Ant1 Low Hop_2402 -15.48 -50.3 ≤-35.48 PASS DH5 Ant1 High Hop_2480 -16.10 -48.83 ≤-36.1 PASS 2DH5 Ant1 Low 2402 -15.36 -50.64 ≤-35.36 PASS 2DH5 Ant1 High 2480 -17.94 -49.55 ≤-37.94 PASS 2DH5 Ant1 Low Hop_2402 -20.07 -51.07 ≤-40.07 PASS 2DH5 Ant1 High Hop_2480 -19.36 -…

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FCC TEST REPORT Test report On Behalf of Ecoute Audio Inc. For vacuum tube audio headphone Model No.: e01, e02, e03 FCC ID: 2BHTD-E01 Prepared for : Ecoute Audio Inc. 125 S. King, Street, PO Box 2922, Jackson, Wyoming, 83001, United States Prepared By : Shenzhen Tongzhou Testing Co.,Ltd 1th Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Date of Test: 2024/7/15 ~ 2024/7/21 Date of Report: 2024/7/22 Report Number: TZ240706097-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.: TZ240706097-BT Page 2 of 37 TEST RESULT CERTIFICATION Applicant’s name ................. : Ecoute Audio Inc. Address .................................. : 125 S. King, Street, PO Box 2922, Jackson, Wyoming, 83001, United States Manufacture's Name ............ : SHENZHEN AKAUDIO CO.,LIMITED Address .................................. : 7/F, Bldg A, 1st Shuichanjingwan Industrial Park, Nanchang Village, Gushu, Xixiang, Bao’an District, Shenzhen, P.R.C. Product description Trade Mark ................................ : écoute Product name ............................ : vacuum tube audio headphone Model and/or type reference . : e01, e02, e03 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 ............. : 2024/7/15 ~ 2024/7/21 Date of Issue .......................................... : 2024/7/22 Test Result .............................................. : Pass Testing Engineer : (Allen Lai) Technical Manager : (Hugo Chen) Authorized Signatory : (Andy Zhang) Report No.: TZ240706097-BT Page 3 of 37 Revision History Revision Issue Date Revisions Revised By 00 2024/7/22 Initial Issue Andy Zhang Report No.: TZ240706097-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 Conducted Spurious Emissions and Band Edges Test ......................................................... 16 5.6 Restricted Band Emission Limit ...............…

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Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BHTD-E01 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: 2BHTD-E01 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