2AZ42-T3True Wireless stereo Earphone

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Dongguan X-power Intelligent Technology Co., Ltd Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2021-05-31 Subject; Request for Long Term Confidentiality FCC ID: 2AZ42-T3 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Hao Liu Title: Sales Manager

Dongguan X-power Intelligent Technology Co., Ltd 601, Building 5, No.2 Jintian Road, HuangDong, Dongguan, GuangDong, China Statement Product: True Wireless stereo Earphone Model No.: T3 Additional Model No.: T15, TS01, T6, TS31, T11, T16, T17, VK-1137, VK-1138 Trade Mark: N/A We hereby state that All models above are identical in interior structure, electrical circuits and components, and just model names are different for the marketing requirement. Your assistance on this matter is highly appreciated. Yours sincerely, Signature: Date: 2021/05/31 Name: Hao Liu Title: Sales Manager Company: Dongguan X-power Intelligent Technology Co., Ltd

Dongguan X-power Intelligent Technology Co., Ltd Agent Authorization Company: Dongguan X-power Intelligent Technology Co., Ltd Address: 601, Building 5, No.2 Jintian Road, HuangDong, Dongguan, GuangDong, China Product Name: True wireless stereo Earphone Model Number(s): T3, T15, TS01, T6, TS31, T11, T16, T17, VK-1137, VK-1138 Product Description: True wireless stereo Earphone We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. i s allowed to forward all information related to the approval and certification of equipment to t he regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of o ur own. Signature: Date: 2021-05-31 Name: Hao Liu Title: Sales Manager Company: Dongguan X-power Intelligent Technology Co., Ltd

Page 1 of 7 Appendix C: Photographs of EUT Product: True Wireless stereo Earphone Model: T3 External Photos Page 2 of 7 Page 3 of 7 Page 4 of 7 Page 5 of 7 Page 6 of 7 Page 7 of 7

Label Artwork and Location Model: T3 Label: Size: L*W=16*4mm FCC ID: 2AZ42-T3 Location

Page 1 of 3 Appendix C: Photographs of EUT Product: True Wireless stereo Earphone Model: T3 Internal Photos Page 2 of 3 Antenna Page 3 of 3

RF exposure evaluation §2.1093 Radiofrequency radiation exposure evaluation: Portable Devices. According to§15.247(i) and§1.1307b(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the commission’s guidance. The 1-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)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, where  f(GHz) is the RF channel transmit frequency in GHz  Power and distance are rounded to the nearest mW and mm before calculation  When the minimum test separation distance is < 5 mm, a distance of 5 mm according is applied to determine SAR test exclusion.  The result is rounded to one decimal place for comparison  For EDR+BDR: Channel Frequency (GHz) Max. Power (dBm) Tune up Power (dBm) Max. Tune up Power (dBm) Max. Tune up Power (mW) Test distance (mm) Result exclusion thresholds for 1-g SAR CH 00 2.402 -5.335 -6±1 -5 0.32 5 0.10 3.0  For BLE: Channel Frequency (GHz) Max. Power (dBm) Tune up Power (dBm) Max. Tune up Power (dBm) Max. Tune up Power (mW) Test distance (mm) Result exclusion thresholds for 1-g SAR CH 19 2.440 -8.107 -9±1 -8 0.16 5 0.05 3.0 Result: Base on the calculation value, No SAR measurement is required.

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID: 2AZ42-T3 Product: True Wireless stereo Earphone Model No.: T3 Additional Model No.: T15, TS01, T6, TS31, T11, T16, T17, VK-1137, VK-1138 Trade Mark: N/A Report No.: TCT210517E041 Issued Date: May 28, 2021 Issued for: Dongguan X-power Intelligent Technology Co., Ltd 601, Building 5, No.2 Jintian Road, HuangDong, Dongguan, GuangDong, China. Issued By: Shenzhen Tongce Testing Lab TCT Testing Industrial Park, Fuqiao 5th Industrial Zone, Fuhai Street, Bao'an District, Shenzhen, Guangdong, 518103, People's Republic of China TEL: +86-755-27673339 FAX: +86-755-27673332 Note: This report shall not be reproduced except in full, without the written approval of Shenzhen Tongce Testing Lab. This document may be altered or revised by Shenzhen Tongce Testing Lab personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT210517E041 Page 2 of 42 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TABLE OF CONTENTS 1. Test Certification ..................................................................................... 3 2. Test Result Summary .............................................................................. 4 3. EUT Description ....................................................................................... 5 4. General Information ................................................................................. 6 4.1. Test environment and mode ................................................................................. 6 4.2. Description of Support Units ................................................................................ 6 5. Facilities and Accreditations .................................................................. 7 5.1. Facilities ................................................................................................................. 7 5.2. Location ................................................................................................................. 7 5.3. Measurement Uncertainty ..................................................................................... 7 6. Test Results and Measurement Data ..................................................... 8 6.1. Antenna requirement ............................................................................................ 8 6.2. Conducted Emission ............................................................................................. 9 6.3. Conducted Output Power ................................................................................... 13 6.4. Emission Bandwidth ........................................................................................... 14 6.5. Power Spectral Density ....................................................................................... 15 6.6. Conducted Band Edge and Spurious Emission Measurement ....................... 16 6.7. Radiated Spurious Emission Measurement ...................................................... 18 Appendix A: Test Result of Conducted Test Appendix B: Photographs of Test Setup Appendix C: Photographs of EUT Report No.: TCT210517E041 Page 3 of 42 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. Test Certification Product: True Wireless stereo Earphone Model No.: T3 Additional Model No.: T15, TS01, T6, TS31, T11, T16, T17, VK-1137, VK-1138 Trade Mark: N/A Applicant: Dongguan X-power Intelligent Technology Co., Ltd Address: 601, Building 5, No.2 Jintian Road, HuangDong, Dongguan,, GuangDong, China. Manufacturer: Dongguan X-power Intelligent Technology Co., Ltd Address: 601, Building 5, No.2 Jintian Road, HuangDong, Dongguan,, GuangDong, China. Date of Test: May 18, 2021 – May 27, 2021 Applicable Standards: FCC CFR Title 47 Part 15 Subpart C Section 15.247 FCC KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.10:2013 The above equipment has been tested by Shenzhen Tongce Testing Lab and found compliance with the requirements set forth in the technical standards mentioned above. The results of testing in this report apply only to the product/system, which was tested. Other similar equipment will not necessarily produce the same results due to production tolerance and measurement uncertainties. Tested By: Date: May 27, 2021 Brews Xu Reviewed By: Date: May 28, 2021 Beryl Zhao Approved By: Date: May 28, 2021 Tomsin Report No.: TCT210517E041 Page 4 of 42 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 2. Test Result Summary Requirement CFR 47 Section Result Antenna requirement §15.203/§15.247 (c) PASS AC Power Line Conducted Emission §15.207 PASS Conducted Peak Output Power §15.247 (b)(3) PASS 6dB Emission Bandwidth §15.247 (a)(2) PASS Power Spectral Density §15.247 (e) PASS Band Edge §15.247(d) PASS Spurious Emission §15.205/§15.209 PASS Note: 1. PASS: Test item meets the requirement. 2. Fail: Test item does not meet the requirement. 3. N/A: Test case does not apply to the test object. 4. The test result judgment is decided by the limit of test standard. 5. After pre-testing of two samples with different memory chip, we found that the one with ISOCOM memory chip is the worst case, so the results are recorded in this report. Report No.: TCT210517E041 Page 5 of 42 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. EUT Description Product: True Wireless stereo Earphone Model No.: T3 Additional Model No.: T15, TS01, T6, TS31, T11, T16, T17, VK-1137, VK-1138 Trade Mark: N/A Bluetooth Version: V5.1 (This report is for BLE) Operation Frequency: 2402MHz~2480MHz Channel Separation: 2MHz Data Rate: 1MHz PHY Number of Channel: 40 Modulation Type: GFSK Antenna Type: Ceramic Antenna Antenna Gain: 0.5dBi Power Supply: Rechargeable Li-ion Battery DC 3.7V Remark: All models above ar…

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Page 1 of 2 Appendix B: Photographs of Test Setup Product: True Wireless stereo Earphone Model: T3 Radiated Emission Page 2 of 2 Conducted Emission