2ALNA-BTS25SPortable Wireless Speaker

ShenzhenThousandshoresTechnologyCo.,Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2021-03-25 Subject; Request for Long Term Confidentiality FCC ID: 2ALNA-BTS25S 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. 5th Floor, Chuangxin Building, Seven-star Creative Square, North Lane 2, Chuangye 2nd Road, Xin'an Boulevard, Bao'an District, Shenzhen, Guangdong Province, China Agent Authorization Company:Shenzhen Thousandshores Technology Co., Ltd. Address:5th Floor, Chuangxin Building, Seven-star Creative Square, North Lane 2, Chuangye 2nd Road, Xin'an Boulevard, Bao'an District, Shenzhen, Guangdong Province, China Product Name: Portable Wireless Speaker Model Number(s): BTS25S Product Description: Portable Wireless Speaker 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: 2021-03-25 Name: Catherine Lu Title: Test engineer Company: Shenzhen Thousandshores Technology Co., Ltd.

Page 1 of 4 Appendix B: Photographs of EUT Product: Portable Wireless Speaker Model: BTS25S External Photos Page 2 of 4 Page 3 of 4 Page 4 of 4

Label Artwork and Location Model:BTS25S SIZE L*W= 210-155819 210-155819 5mm

Page 1 of 5 Appendix B: Photographs of EUT Product: Portable Wireless Speaker Model: BTS25S Internal Photos Antenna Page 2 of 5 Page 3 of 5 Page 4 of 5 Page 5 of 5

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 78 2.480 3.07 2.5±1 3.5 2.24 5 0.71 3.0 Result: Base on the calculation value, No SAR measurement is required.

Page 1 of 2 Appendix A: Photographs of Test Setup Product: Portable Wireless Speaker Model: BTS25S Radiated Emission Page 2 of 2 Conducted Emission