2ASYY-GS828A-CCarbon Monoxide Alarm

Sensitivity Setting: Conforms to U L Std.U L2034 4th Ed environment

Product standards: U L Std.U L2034 4th Ed Sensitivity Setting: Conforms to U L Std.U L2034 4th Ed

Difference Statement GS828A-C, GS828C-B The two models are only named differently. Everything else is the same. We chose " GS828A-C " for RF testing August 10, 2022 Cynthia Xia/Certificate engineer Siterwell Electronics Co., Limited

Siterwell Electronics Co., Limited 2022-8-6 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Carbon Monoxide Alarm / GS828A-C, GS828C-B #2ASYY-GS828A-C #) 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 (Block Diagram, Schematics, Operational Description) required to be submitted with this application be permanently withheld from public review. i.e. the above documents are company proprietary information that could never get into the possession of your competition. Please contact me if there is any information you may need. Sincerely, CynthiaXia/Certificate engineer Siterwell Electronics Co., Limited

Siterwell Electronics Co., Limited 2022-8-9 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 EMTEK (NINGBO) 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, CynthiaXia/Certificate engineer Siterwell Electronics Co., Limited

Siterwell Electronics Co., Limited 2022-8-9 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Short Term Confidentiality Request For Carbon Monoxide Alarm / GS828A-C, GS828C-B # 2ASYY-GS828A-C # To Whom It May Concern: In accordance with sections 0.457 and 0.459 of CFR 47, Ningbo lianda winch co., ltd. requests short-term Confidentiality of following sections of this application for a period of 180 days after grant is issued. Test setup photos Internal photos User’s manual These documents contain detailed system and equipment descriptions and related information about the product, which Ningbo lianda winch co., ltd considers to be proprietary, confidential, and a custom design and otherwise, would not release to the general public. Since this design is a basis from which future technological products will evolve, Ningbo lianda winch co., ltd feels that this information would be of benefit to its competitors, and that the disclosure of the information in these documents would give our competitors an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, CynthiaXia/Certificate engineer Siterwell Electronics Co., Limited

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Label Location Model: GS828A‐C FCC ID: 2ASYY‐GS828A‐C

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Report No.ENB2205160031W00301R Page 1 of 29 Ver.1.0 TEST REPORT Product Name : Carbon Monoxide Alarm Model Number : GS828A-C, GS828C-B FCC ID : 2ASYY-GS828A-C $二维码$ Prepared for : Siterwell Electronics Co., Limited Address : No.666 Qingfeng Road, Jiangbei District, Ningbo, Zhejiang, China Prepared by : EMTEK (NINGBO) CO., LTD. Address : 1F Building 4, 1177#, Lingyun Road, Ningbo National Hi-Tech Zone, Ningbo, Zhejiang, China. Tel: +86-574-27907998 Fax: +86-574-27721538 Report Number : ENB2205160031W00301R Date(s) of Tests : May 16, 2022 to June 02, 2022 Date of Issue : August 10, 2022 Report No.ENB2205160031W00301R Page 2 of 29 Ver.1.0 Table of Contents 1 TEST RESULT CERTIFICATION ......................................................................................................................... 3 2 EUT TECHNICAL DESCRIPTION ....................................................................................................................... 5 3 SUMMARY OF TEST RESULT ............................................................................................................................ 6 4 TEST METHODOLOGY ....................................................................................................................................... 7 4.1 GENERAL DESCRIPTION OF APPLIED STANDARDS .................................................................................... 7 4.2 MEASUREMENT EQUIPMENT USED.............................................................................................................. 7 4.3 DESCRIPTION OF TEST MODES ..................................................................................................................... 9 4.4 TEST SOFTWARE ............................................................................................................................................. 9 5 FACILITIES AND ACCREDITATIONS ............................................................................................................... 10 5.1 FACILITIES ....................................................................................................................................................... 10 5.2 LABORATORY ACCREDITATIONS AND LISTINGS ........................................................................................ 10 6 TEST SYSTEM UNCERTAINTY ........................................................................................................................ 11 7 SETUP OF EQUIPMENT UNDER TEST ........................................................................................................... 12 7.1 RADIO FREQUENCY TEST SETUP 1 ............................................................................................................. 12 7.2 RADIO FREQUENCY TEST SETUP 2 ............................................................................................................. 12 7.3 CONDUCTED EMISSION TEST SETUP ......................................................................................................... 14 7.4 SUPPORT EQUIPMENT .................................................................................................................................. 14 8 TEST REQUIREMENTS .................................................................................................................................... 15 8.1 BANDWIDTH TEST .......................................................................................................................................... 15 8.2 RADIATED SPURIOUS EMISSION ................................................................................................................. 17 8.3 CONDUCTED EMISSIONS TEST .................................................................................................................... 27 8.4 ANTENNA APPLICATION ................................................................................................................................ 28 Report No.ENB2205160031W00301R Page 3 of 29 Ver.1.0 1 TEST RESULT CERTIFICATION Applicant : Siterwell Electronics Co., Limited Address : No.666 Qingfeng Road, Jiangbei District, Ningbo, Zhejiang, China Manufacturer : Siterwell Electronics Co., Limited Address : No.666 Qingfeng Road, Jiangbei District, Ningbo, Zhejiang, China EUT : Carbon Monoxide Alarm Model Name : GS828A-C, GS828C-B Trademark : N/A Measurement Procedure Used: APPLICABLE STANDARDS STANDARD TEST RESULT FCC 47 CFR Part 2, Subpart J FCC 47 CFR Part 15, Subpart C PASS The above equipment was tested by EMTEK (NINGBO) CO., LTD. The test data, data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C63.10 (2013) and the energy emitted by the sample EUT tested as described in this report is in compliance with the requirements of FCC Rules Part 2 and Part 15.249 The test results of this report relate only to the tested sample identified in this report. Date of Test : May 16, 2022 to June 02, 2022 Prepared by : June Gao/Engineer Reviewer : Vinay/Supervisor Approved & Authorized Signer : Tony Wei/Manager Report No.ENB2205160031W00301R Page 4 of 29 Ver.1.0 Modified History Version Report No. Revision Date Summary / ENB2205160031W00301R / Original Report Report No.ENB2205160031W00301R Page 5 of 29 Ver.1.0 2 EUT TECHNICAL DESCRIPTION Product: Carbon Monoxide Alarm Model Number: GS828A-C, GS828C-B (Note: The two models are only named differently. Everything else is the same. We chose " GS828A-C " for RF testing) Sample Number: 1# Power Supply: DC 3V for Battery Test Voltage: DC 3V Modulation: FSK Frequency Range: 915.3 MHz Max Transmit Power: 91.35 dBuV/m Antenna: Spring Antenna Antenna Gain: 1.0 dBi Temperature Range: -40°C ~ 85°C Date of Receiver: May 16, 2022 Note: for more details, please refer to the user’s manual of the EUT. Report No.ENB2205160031W00301R Page 6 of 29 Ver.1.0 3 SUMMARY OF TEST RESULT FCC Part Clause Test Parameter Verdict Remark 15.207 Cond…

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