2AS5O-EBP-22055ART + SOUND BT HEADPHONE

C566091_X23_Ed1 1/1 US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: Southern Telecom Inc FRN: 0017985201 Contact Name: Lina Qian Address: 5601 1st Ave 2nd Floor Brooklyn, NY 11220 United States Telephone (718) 567-7778 131 Email: [email protected] This letter is to confirm that the US Agent for Service of Process accepts responsibility to act as a local representative on behalf of China Etech Groups Ltd The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Applicant: Company name: China Etech Groups Ltd Product Description: ART + SOUND BT HEADPHONE Grantee code: 2AS5O FCC ID: 2AS5O-EBP-22055 Contact Name: Paul Huang Address: 16/F, Block C, 2nd Phase of Central Avenue, Haihong Industrial Area, Xixiang, Baoan, Shenzhen, China Telephone No: +86 0755-29402910 Email: [email protected] The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. This Agreement is valid until (product lifetime). Date: 3.15.2023 Applicant’s Name: Paul Huang US Agent for Service of Process’s Name: Lina Qian Title: Manager Title: Manger Signature Signature

C5266091_X24_Ed.1 1/1 “Attestation Statements” TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 The Commission adopted rules that prohibit equipment authorization for “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List 1 , which is periodically updated. See the Covered List for more details. This Attestation Statement is to confirm that we follow the Section 2.911(d)(5)(i)-(ii) Applicant Company name: China Etech Groups Ltd Grantee code: 2AS5O FCC ID: 2AS5O-EBP-22055 Contact Name: Paul Huang Address: 16/F, Block C, 2nd Phase of Central Avenue, Haihong Industrial Area, Xixiang, Baoan, Shenzhen, China Telephone No: +86 0755-29402910 Fax No: 0755-29402910 Email: [email protected] i. [China Etech Groups Ltd] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. The applicant must sign this certification. ii. [China Etech Groups Ltd] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. The applicant must sign this certification. Date: 3.15.2023 Applicant’s Name: Paul Huang Title: Manager Signature 1 The Commission’s Covered List is published by the Public Safety and Homeland Security Bureau and posted on the Commission’s website. This Covered List, which is periodically updated, identifies particular equipment, produced by particular entities, that constitutes “covered” equipment. https://www.fcc.gov/supplychain/coveredlist

China Etech Groups Ltd Product Similarity Declaration Product name: ART + SOUND BT HEADPHONE Model name: EBP-22055, ARBT258 FCC ID: 2AS5O-EBP-22055 We (China Etech Groups Ltd) hereby state that all the models are electrical identical including the same software parameter and hardware design (i.e., circuit design, PCB Layout, RF module/circuit, antenna type(s) and antenna location, components on PCB, etc.,), same mechanical structure and design (including product enclosure, materials, etc.,), the only difference is the model name and color. Demonstrate the detail(descriptions and pictures) as to the difference list above. Signature: Name: Paul Huang Title: Manager Date: 3.15.2023

C5266091_X10_Ed.2 1/1 China Etech Groups Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: 3/15/2023 Subject: Request for Confidentiality FCC ID: 2AS5O-EBP-22055 To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☐ Internal Photos ☐ NOTE 1 ☐ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. In case of short-term Confidentiality, the applicant requests the exhibits selected above are withheld from public view for a period of ______ days from the date of the Grant of Equipment Authorization and prior to marketing. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. C5266091_X10_Ed.2 1/1 Sincerely, Signature: Name: Paul Huang Title: Manager

Page 1 of 4 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Appendix - Ext Photos Model: EBP-22055 Page 2 of 4 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Page 3 of 4 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Page 4 of 4 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] ----End of Report----

Model NO: ARBT258 Input: 5V 1A FCC ID: 2AS5O-EBP-22055 QDID: 172491 Made in China 03/23 Location

Page 1 of 3 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Appendix - Int Photos Model: EBP-22055 ANT Page 2 of 3 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Page 3 of 3 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] ----End of Report----

Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] RF EXPOSURE Test Report Report No.: MTi230223008-01E2 Date of issue: 2023-03-10 Applicant: China Etech Groups Ltd Product name: ART + SOUND BT HEADPHONE Model(s): EBP-22055, ARBT258 FCC ID: 2AS5O-EBP-22055 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 6- Report No.: MTi230223008-01E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Instructions 1. The report shall not be partially reproduced without the written consent of the laboratory; 2. The test results of this report are only responsible for the samples submitted; 3. This report is invalid without the seal and signature of the laboratory; 4. This report is invalid if transferred, altered or tampered with in any form without authorization; 5. Any objection to this report shall be submitted to the laboratory within 15 days from the date of receipt of the report. - Page 3 of 6- Report No.: MTi230223008-01E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Test Result Certification Applicant: China Etech Groups Ltd Address: 16/F, Block C, 2nd Phase of Central Avenue, Haihong Industrial Area, Xixiang, Baoan, Shenzhen, China Manufacturer: China Etech Groups Ltd Address: 16/F, Block C, 2nd Phase of Central Avenue, Haihong Industrial Area, Xixiang, Baoan, Shenzhen, China Product description Product name: ART + SOUND BT HEADPHONE Trademark: N/A Model name: EBP-22055 Serial Model: ARBT258 Standards: N/A Test method: KDB 447498 D01 v06 Date of Test Date of test: 2023-02-25 ~ 2023-03-07 Test result: Pass Testing Engineer : (David Lee) Technical Manager : (Leon Chen) Authorized Signatory : (Tom Xue) - Page 4 of 6- Report No.: MTi230223008-01E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Table of Contents 1. STANDALONE SAR TEST EXCLUSION CONSIDERATIONS ............................................................................................ 5 2. SAR TEST EXCLUCSION THRESHOLDS ........................................................................................................................ 6 - Page 5 of 6- Report No.: MTi230223008-01E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] 1. Standalone SAR test exclusion considerations Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions. The minimum test separation distance defined in 4.1 f) is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander. To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified, typically in the SAR measurement or SAR analysis report, by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting are required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions. a) For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity 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  The result is rounded to one decimal place for comparison  The values 3.0 and 7.5 are referred to as numeric thresholds in step b) below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm, and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 4.1 f) is applied to determine SAR test exclusion. b) For 100 MHz to 6 GHz and test separation distances > 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following (also illustrated in Appendix B): 1) {[Power allowed at numeric threshold for 50 mm in step a)] + [(test separation distance – 50 mm)·(f(MHz)/150)]} mW, for 100 MHz to 1500 MHz 2) {[Power allowed at numeric threshold for 50 mm in step a)] + […

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Product specification Quick Reference Date All the technical data and information contained herein are subject to change without prior notice Antenna Layout & module on the system board Antenna Gain Gain Table Antenna Type: PCB antenna Frequency 2400~2480MHz Ant. Port Input Pwr. (dBm) 0 (Typ. BT class 2 output power) Tot. Rad. Pwr. (dBm) -2.3 (Input pwr – loss pwr) Peak EIRP(dBm) 1.3 Directivity (dBi) 1 (all direction antenna) Efficiency (dB) -2.3 (58.5%) Gain (dBi) 1.3 Maximum Power (dBm) 1.3 (XY-plane) Minimum Power (dBm) -4(XY-plane) Avg. Power (dBm) -0.5(XY-plane) Max/Min Ratio (dB) 5.3(XY-plane) Max/Avg Ratio (dB) 1.8(XY-plane) Min/Avg Ratio (dB) -3.5(XY-plane) Manufacturer: China Etech Groups Ltd Antenna Type: PCB antenna Frequency 2400~2480MHz Ant. Port Input Pwr. (dBm) 0 (Typ. BT class 2 output power) Tot. Rad. Pwr. (dBm) -2.3 (Input pwr – loss pwr) Peak EIRP(dBm) 1.3 Directivity (dBi) 1 (all direction antenna) Efficiency (dB) -2.3 (58.5%) Gain (dBi) 1.3 Maximum Power (dBm) 1.3 (XY-plane) Return Loss The Environment of Antenna Radiation Pattern 3D radiation pattern diagram (2420MHz)

Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Test Report Report No.: MTi230223008-01E1 Date of issue: 2023-03-10 Applicant: China Etech Groups Ltd Product: ART + SOUND BT HEADPHONE Model(s): EBP-22055, ARBT258 FCC ID: 2AS5O-EBP-22055 Shenzhen Microtest Co., Ltd. http://www.mtitest.com Page 2 of 65 Report No.: MTi230223008-01E1 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86‐755)88850135 Fax: (86‐755) 88850136 Web: www.mtitest.com E‐mail: [email protected] Instructions 1. This test report shall not be partially reproduced without the written consent of the laboratory. 2. The test results in this test report are only responsible for the samples submitted 3. This test report is invalid without the seal and signature of the laboratory. 4. This test report is invalid if transferred, altered, or tampered with in any form without authorization. 5. Any objection to this test report shall be submitted to the laboratory within 15 days from the date of receipt of the report. Page 3 of 65 Report No.: MTi230223008-01E1 Address: 101, No.7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86‐755)88850135 Fax: (86‐755) 88850136 Web: www.mtitest.com E‐mail: [email protected] Table of contents 1 General Description .......................................................................................................................... 5 1.1 Description of the EUT ....................................................................................................................................... 5 1.2 Description of test modes ................................................................................................................................... 5 1.3 Test conditions .................................................................................................................................................... 7 1.4 Description of support units ................................................................................................................................ 7 2 Measurement uncertainty ................................................................................................................. 8 3 Summary of Test Result .................................................................................................................... 9 4 Test Laboratory................................................................................................................................ 10 5 Equipment List ................................................................................................................................ 11 6 Test Result ....................................................................................................................................... 12 6.1 Antenna requirement ........................................................................................................................................ 12 6.2 AC power line conducted emissions ................................................................................................................. 13 6.3 Radiated spurious emission ............................................................................................................................. 14 6.4 20dB emission bandwidth ................................................................................................................................ 23 6.5 Maximum conducted output power .................................................................................................................. 24 6.6 Carrier frequency separation ............................................................................................................................ 25 6.7 Time of occupancy ............................................................................................................................................ 26 6.8 Number of hopping channels ........................................................................................................................... 27 6.9 Band edge (Conducted) ................................................................................................................................... 28 6.10 Conducted spurious emissions ...................................................................................................................... 29 Appendix A: 20dB Emission Bandwidth .............................................................................................. 30 Appendix B: Maximum conducted output power ................................................................................ 34 Appendix C: Carrier frequency separation .......................................................................................... 38 Appendix D: Time of occupancy ........................................................................................................... 40 Appendix E: Number of hopping channels .......................................................................................... 47 Appendix F: Band edge measurements ............................................................................................... 49 Appendix G: Conducted Spurious Emission ....................................................................................... 54 Photographs of the Test Setup .............................................................................................................. 64 Photographs of the EUT ........................................................................................................................ 65 Page 4 of 65 Report No.: MTi230223008-01E1 Address: 101, No.7, Zone 2, Xinxing…

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Page 1 of 1 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Appendix - Test Setup Photos Model: EBP-22055 Radiated emissions –Below 1 GHz Radiated emissions –Above 1 GHz ----End of Report----