2BBGF-W542COROS APEX 4 42mm

Guangdong COROS Sports Technology Co., Ltd Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 [November 18, 2025] U.S. Agent Designation [Guangdong COROS Sports Technology Co., Ltd] acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought FCC ID: 2BBGF-W542 Name and company of U.S. agent: [GLOCERTS TECHNOLOGY INC] Physical U.S. address of agent: [19784 SUNKISSED RIDGE DR, RIVERSIDE, CA 92507] FRN of U.S. agent: [0036339737] Email address of U.S. agent: [[email protected]] Telephone of U.S.agent: (626) 588-8039 [GLOCERTS TECHNOLOGY INC] acknowledges their obligation to accept service of process on behalf of [Guangdong COROS Sports Technology Co., Ltd]. [Guangdong COROS Sports Technology Co., Ltd] with the FRN [0033838632] accepts its obligation to maintain an agent for service of process in the United States for no less than 1 year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. Sincerely, Signature Signature [Qiang Wu] [Huiying Fan] [Engineer] [Director] [Guangdong COROS Sports Technology Co., Ltd] [GLOCERTS TECHNOLOGY INC]

Guangdong COROS Sports Technology Co., Ltd (November 14, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: 2BBGF-W542 [Guangdong COROS Sports Technology Co., 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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, (Applicant signature) (Applicant printed name) Qiang Wu Guangdong COROS Sports Technology Co., Ltd (November 14, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: 2BBGF-W542 [Guangdong COROS Sports Technology Co., 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. Sincerely, (Applicant signature) (Applicant printed name) Qiang Wu

Guangdong COROS Sports Technology Co., Ltd (November 14, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (COROS APEX 4 42mm / W542 / FCC ID: 2BBGF-W542) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the 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 required to be submitted with this application be permanently withheld from public review. 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. Please contact me if there is any information you may need. Sincerely, Signature: Name: Qiang Wu Title: Engineer

Guangdong COROS Sports Technology Co., Ltd (November 14, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Signature: Name: Qiang Wu Title: Engineer

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Model:W542 External Photos Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 4 ANT Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 4

Instructions for Regulatory Info To view product-specific regulatory and compliance information: Settings > More Settings > Device Info

Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 41 TEST REPORT Compiled by: Reviewed by: Approved by: Zhang Mao cheng Martin Feng Rita Xiao / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: COROS APEX 4 42mm FCC ID: 2BBGF-W542 Trademark: COROS Model Number: W542 Prepared For: Guangdong COROS Sports Technology Co., Ltd Address: Room 601, Room 701, Building 2, No. 2, Science and Technology 9 Rd, Songshan Lake Hi Tech Zone, Dongguan City, Guangdong Province, P.R. China Manufacturer: Guangdong COROS Sports Technology Co., Ltd Address: Room 601, Room 701, Building 2, No. 2, Science and Technology 9 Rd, Songshan Lake Hi Tech Zone, Dongguan City, Guangdong Province, P.R. China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Jul. 13, 2025 Sample tested Date: Jul. 13, 2025 to Aug. 23, 2025 Issue Date: Aug. 23, 2025 Report No.: CTB25071300230RH04 Test Standards FCC 47 CFR Part2(2.1093), FCC 47 CFR Part1( 1.1310) FCC 47 CFR Part1( 1.1307), ANSI/IEEE C95.1-2019 IEEE 1528-2013 & Published RF Exposure KDB Procedures Test Results PASS Remark: This is SAR test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25071300229RH04 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 41 Contents Page 1 COVER PAGE ......................................................................................................................................... 1 CONTENTS ....................................................................................................................................................................... 2 1. VERSION .................................................................................................................................................................. 4 2. PRODUCT INFORMATION AND TEST SETUP............................................................................................... 5 2.1 PRODUCT INFORMATION ................................................................................................................................... 5 3 EQUIPMENT USED DURING TEST ................................................................................................................... 6 3.1 EQUIPMENT LIST ............................................................................................................................................... 6 3.2 TEST EQUIPMENT CALIBRATION ....................................................................................................................... 7 4 SAR INTRODUCTION ........................................................................................................................................... 8 4.1 INTRODUCTION .................................................................................................................................................. 8 4.2 SAR DEFINITION ............................................................................................................................................... 8 5 SAR MEASUREMENT SETUP ............................................................................................................................. 9 5.1 SAR MEASUREMENT SETUP ...................................................................................................................... 9 5.2 DASY5 E-FIELD PROBE SYSTEM .................................................................................................................... 10 5.3 PROBE SPECIFICATION ..................................................................................................................................... 10 5.4 ISOTROPIC E-FIELD PROBE .............................................................................................................................. 10 5.5 PHANTOMS ...................................................................................................................................................... 11 5.6 DEVICE HOLDER .............................................................................................................................................. 11 6 SAR TEST PROCEDURE .................................................................................................................................... 12 6.1 SCANNING PROCEDURE ................................................................................................................................... 12 6.2 EXTRAPOLATION ............................................................................................................................................. 15 6.3 TEST POSITION – BODY CONFIGURATIONS ...................................................................................................... 15 7 EXPOSURE LIMIT ............................................................................................................................................... 16 7.1 UNCONTROLLED ENVIRONMENT ..................................................................................................................... 16 7.2 CONTROLLED ENVIRONMENT .......................................................................................................................... 16 8 SYSTEM AND LIQUID VALIDATION ...............…

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W542 Antenna Information Company: Guangdong COROS Sports Technology Co., Ltd Model: W542_2.4GHz_ANT Antenna Type: Loop antenna Frequency: 2.4GHz Manufacturer:Dongguan City AITE Precision Hardware parts Co.Ltd Address：Room 101， Building 9, No. 198 Zhenxing Avenue,Xiegang Town, Dongguan City, Guangdong Province 1.Cable loss：0.3dbm 2.Antenna peak gain：-2.82dBi Freq(MHz)Efficiency_dBGain_dBi 2400-9.2-2.82 2410-9.2-2.84 2420-9.2-2.85 2430-9.3-2.88 2440-9.3-2.9 2450-9.3-2.92 2460-9.4-2.96 2470-9.4-2.96 2480-9.5-3.1 2490-9.5-3.2 2500-9.5-3.2 3 Antenna pattern：As fllow (@2400MHz) Theta90 Phi0： Phi90： 4 Antenna size：37.15mm*3.39mm

Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 41 TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: COROS APEX 4 42mm FCC ID: 2BBGF-W542 Trademark: COROS Model Number: W542 Prepared For: Guangdong COROS Sports Technology Co., Ltd Address: Room 601, Room 701, Building 2, No. 2, Science and Technology 9 Rd, Songshan Lake Hi Tech Zone, Dongguan City, Guangdong Province, P.R. China Manufacturer: Guangdong COROS Sports Technology Co., Ltd Address: Room 601, Room 701, Building 2, No. 2, Science and Technology 9 Rd, Songshan Lake Hi Tech Zone, Dongguan City, Guangdong Province, P.R. China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Jul. 13, 2025 Sample tested Date: Jul. 13, 2025 to Jul. 24, 2025 Issue Date: Jul. 24, 2025 Report No.: CTB25071300230RF01 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25071300230RF01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 41 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ........................................................................................................................................ 3 2. TEST SUMMARY ........................................................................................................................... 4 3. MEASUREMENT UNCERTAINTY ................................................................................................. 5 4. PRODUCT INFORMATION AND TEST SETUP ............................................................................ 6 4.1 Product Information .......................................................................................................................... 6 4.2 Test Setup Configuration .................................................................................................................. 6 4.3 Support Equipment........................................................................................................................... 6 4.4 Channel List ..................................................................................................................................... 7 4.5 Test Mode ........................................................................................................................................ 7 4.6 Test Environment ............................................................................................................................. 7 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................................................... 8 5.1 Test Facility ...................................................................................................................................... 8 5.2 Test Instrument Used ....................................................................................................................... 8 6. AC POWER LINE CONDUCTED EMISSION ................................................................................ 11 6.1 Block Diagram Of Test Setup ......................................................................................................... 11 6.2 Limit ................................................................................................................................................ 11 6.3 Test procedure ............................................................................................................................... 11 6.4 Test Result ..................................................................................................................................... 13 7. RADIATED SPURIOUS EMISSION ............................................................................................. 15 7.1 Block Diagram Of Test Setup ......................................................................................................... 15 7.2 Limit ................................................................................................................................................ 15 7.3 Test procedure ............................................................................................................................... 16 7.4 Test Result ..................................................................................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ............................................... 24 8.1 Block Diagram Of Test Setup ......................................................................................................... 24 8.2 Limit ................................................................................................................................................ 24 8.3 Test procedure ............................................................................................................................... 24 8.4 Test Result ..................................................................................................................................... 25 9. COUDUCTED OUTPUT POWER ..................…

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Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 63 TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: COROS APEX 4 42mm FCC ID: 2BBGF-W542 Trademark: COROS Model Number: W542 Prepared For: Guangdong COROS Sports Technology Co., Ltd Address: Room 601, Room 701, Building 2, No. 2, Science and Technology 9 Rd, Songshan Lake Hi Tech Zone, Dongguan City, Guangdong Province, P.R. China Manufacturer: Guangdong COROS Sports Technology Co., Ltd Address: Room 601, Room 701, Building 2, No. 2, Science and Technology 9 Rd, Songshan Lake Hi Tech Zone, Dongguan City, Guangdong Province, P.R. China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Jul. 13, 2025 Sample tested Date: Jul. 13, 2025 to Jul. 24, 2025 Issue Date: Jul. 24, 2025 Report No.: CTB25071300230RF03 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is WIFI-2.4GHz band radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25071300230RF03 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 63 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................... 3 2. TEST SUMMARY ................................................................... 4 3. MEASUREMENT UNCERTAINTY ..................................................... 5 4. PRODUCT INFORMATION AND TEST SETUP .......................................... 6 4.1 Product Information .................................................................... 6 4.2 Test Setup Configuration ............................................................... 6 4.3 Support Equipment .................................................................... 6 4.4 Channel List .......................................................................... 6 4.5 Test Mode ............................................................................ 7 4.6 Test Environment ...................................................................... 7 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................... 8 5.1 Test Facility ........................................................................... 8 5.2 Test Instrument Used .................................................................. 8 6. AC POWER LINE CONDUCTED EMISSION ............................................ 11 6.1 Block Diagram Of Test Setup .......................................................... 11 6.2 Limit ................................................................................ 11 6.3 Test procedure ....................................................................... 11 6.4 Test Result .......................................................................... 13 7. RADIATED SPURIOUS EMISSION ................................................... 15 7.1 Block Diagram Of Test Setup .......................................................... 15 7.2 Limit ................................................................................ 15 7.3 Test procedure ....................................................................... 16 7.4 Test Result .......................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 39 8.1 Block Diagram Of Test Setup .......................................................... 39 8.2 Limit ................................................................................ 39 8.3 Test procedure ....................................................................... 39 8.4 Test Result .......................................................................... 40 9. CONDUCTED OUTPUT POWER ..................................................... 48 9.1 Block Diagram Of Test Setup .......................................................... 48 9.2 Limit ................................................................................ 48 9.3 Test procedure ....................................................................... 48 9.4 Test Result .......................................................................... 48 10. 6DB OCCUPIED BANDWIDTH ....................................................... 49 10.1 Block Diagram Of Test Setup ......................................................... 49 10.2 Limit ............................................................................... 49 10.3 Test procedure ...................................................................... 49 10.4 Test Result ......................................................................... 50 11. POWER SPECTRAL DENSITY ...................................................... 55 11.1 Block Diagram Of Test Setup ......................................................... 55 11.2 Limit ............................................................................... 55 11.3 Test procedure ...................................................................... 55 11.4 Test Result ......................................................................... 56 12. ANTENNA REQUIREMENT ......................................................... 61 13. EUT TEST SETUP P…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 1 Model: W542 Front of face Wrist-worn 10mm separation 0mm separation

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: W542 Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions