2ALNA-BTH70Wireless Headphones

Shenzhen Thousandshores Technology Co., Ltd. Date: 2021-05-17 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject; Request for Long Term Confidentiality FCC ID: 2ALNA-BTH70 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: Catherine Lu Title: Test engineer

Shenzhen Thousandshores Technology Co., Ltd. Agent Authorization Company: Shenzhen Thousandshores Technology Co., Ltd. Address: 5/F, Chuangxin Building, Seven-star Creative Square, No.2North Alley, Chuangye 2nd Road, Bao'an Dis 28th, ShenZhen, 518000 China Product Name: Wireless Headphones Model Number(s): IC-BTH70 Product Description: Wireless Headphones 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: 2021-05-17 Name: Catherine Lu Title: Test engineer Company: Shenzhen Thousandshores Technology Co., Ltd.

Page 1 of 4 Appendix B: Photographs of EUT Product: Wireless Headphones Model: IC-BTH70 External Photos Page 2 of 4 Page 3 of 4 Page 4 of 4

Size: L*W=36.5*12.2mm Label Artwork and Location Model: IC-BTH70 Label: Location

Page 1 of 8 Appendix B: Photographs of EUT Product: Wireless Headphones Model: IC-BTH70 Internal Photos Page 2 of 8 Page 3 of 8 Page 4 of 8 Page 5 of 8 Page 6 of 8 ANT Page 7 of 8 Page 8 of 8

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 BDR+EDR: 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 -0.87 0±1 1.0 1.26 5 0.39 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: 2ALNA-BTH70 Product: Wireless Headphones Model No.: IC-BTH70 Additional Model No.: N/A Trade Mark: Tribit Report No.: TCT210427E010 Issued Date: May 11, 2021 Issued for: Shenzhen Thousandshores Technology Co., Ltd. 5/F, Chuangxin Building, Seven-star Creative Square, No.2North Alley, Chuangye 2nd Road, Bao'an Dis 28th, ShenZhen, 518000 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.: TCT210427E010 Page 2 of 70 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.: TCT210427E010 Page 3 of 70 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. Test Certification Product: Wireless Headphones Model No.: IC-BTH70 Additional Model No.: N/A Trade Mark: Tribit Applicant: Shenzhen Thousandshores Technology Co., Ltd. Address: 5/F, Chuangxin Building, Seven-star Creative Square, No.2North Alley, Chuangye 2nd Road, Bao'an Dis 28th, ShenZhen, 518000 China Manufacturer: Shenzhen Thousandshores Technology Co., Ltd. Address: 5/F, Chuangxin Building, Seven-star Creative Square, No.2North Alley, Chuangye 2nd Road, Bao'an Dis 28th, ShenZhen, 518000 China Date of Test: Apr. 28, 2021 – May 10, 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 10, 2021 Aaron Mo Reviewed By: Date: May 11, 2021 Beryl Zhao Approved By: Date: May 11, 2021 Tomsin Report No.: TCT210427E010 Page 4 of 70 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.: TCT210427E010 Page 5 of 70 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. EUT Description Product: Wireless Headphones Model No.: IC-BTH70 Additional Model No.: N/…

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Page 1 of 2 Appendix A: Photographs of Test Setup Product: Wireless Headphones Model: IC-BTH70 Radiated Emission Page 2 of 2 Conducted Emission