2AQSMTSOUND02311Wireless earphones

Tectronics Global Limited Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2020-11-24 Subject; Request for Long Term Confidentiality FCC ID: 2AQSMTSOUND02311 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: Jacky Han Title: Manager

Tectronics Global Limited Agent Authorization Company: Tectronics Global Limited Address: Rm 2106, 21/F, Kwong Kin Trade Centre, No. 5, Kin Fat Street, Tuen Mun, Hong Kong, China Product Name: Wireless earphones Model Number(s): Tsound02311 Product Description: Wireless earphones 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. is allowed to forward all information related to the approval and certification of equipment to the 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 our own. Signature: Date: 2020-11-24 Name:Jacky Han Title:Manager Company: Tectronics Global Limited

Page 1 of 5 Appendix B: Photographs of EUT Product: Wireless earphones Model: Tsound02311 External Photos Page 2 of 5 Page 3 of 5 Page 4 of 5 Page 5 of 5

Label Artwork and Location Model: Label: Size: L*W=10*6mm FCC ID: Tsound02311 2AQSMTSOUND02311 Location

Page 1 of 3 Appendix B: Photographs of EUT Product: Wireless earphones Model: Tsound02311 Internal Photos Page 2 of 3 Antenna Page 3 of 3

RF exposure evaluation FCC ID: 2AQSMTSOUND02311 §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  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 4.87 4.0±1 5.0 3.16 5 0.98 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: 2AQSMTSOUND02311 Product: Wireless earphones Model No.: Tsound02311 Additional Model No.: N/A Trade Mark: Tsound Report No.: TCT201116E901 Issued Date: Nov. 17, 2020 Issued for: Tectronics Global Limited Rm 2106, 21/F, Kwong Kin Trade Centre, No. 5, Kin Fat Street, Tuen Mun, Hong Kong, China Issued By: Shenzhen Tongce Testing Lab. 1B/F., Building 1, Yibaolai Industrial Park, Qiaotou, Fuyong, Baoan District, Shenzhen, Guangdong, 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.: TCT201116E901 Page 2 of 64 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. 20dB Occupy Bandwidth .................................................................................... 18 6.5. Carrier Frequencies Separation ......................................................................... 23 6.6. Hopping Channel Number .................................................................................. 28 6.7. Dwell Time ............................................................................................................ 31 6.8. Pseudorandom Frequency Hopping Sequence ................................................ 36 6.9. Conducted Band Edge Measurement ................................................................ 37 6.10.Conducted Spurious Emission Measurement .................................................. 41 6.11.Radiated Spurious Emission Measurement ..................................................... 45 Appendix A: Photographs of Test Setup Appendix B: Photographs of EUT Report No.: TCT201116E901 Page 3 of 64 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. Test Certification Product: Wireless earphones Model No.: Tsound02311 Additional Model: N/A Trade Mark: Tsound Applicant: Tectronics Global Limited Address: Rm 2106, 21/F, Kwong Kin Trade Centre, No. 5, Kin Fat Street, Tuen Mun, Hong Kong, China Manufacturer: Tectronics Global Limited Address: Rm 2106, 21/F, Kwong Kin Trade Centre, No. 5, Kin Fat Street, Tuen Mun, Hong Kong, China Date of Test: Sep. 08, 2020 – Nov. 16, 2020 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: Nov. 16, 2020 Aaron Mo Reviewed By: Date: Nov. 17, 2020 Beryl Zhao Approved By: Date: Nov. 17, 2020 Tomsin Report No.: TCT201116E901 Page 4 of 64 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)(1) PASS 20dB Occupied Bandwidth §15.247 (a)(1) PASS Carrier Frequencies Separation §15.247 (a)(1) PASS Hopping Channel Number §15.247 (a)(1) PASS Dwell Time §15.247 (a)(1) PASS Radiated Emission §15.205/§15.209 PASS Band Edge §15.247(d) 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. Report No.: TCT201116E901 Page 5 of 64 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. EUT Description Product: Wireless earphones Model No.: Tsound02311 Additional Model: N/A Trade Mark: Tsound Bluetooth version: V5.0 Operation Frequency: 2402MHz~2480MHz Transfer Rate: 1/2/3 Mbits/s Number of Channel: 79 Modulation Type: GFSK, π/4-DQPSK, 8DPSK Modulation Technology: FHSS Antenna T…

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Page 1 of 2 Appendix A: Photographs of Test Setup Product: Wireless earphones Model: Tsound02311 Radiated Emission Right Right Page 2 of 2 Conducted Emission