2ACZU-K4RSelf-powered wireless switch

T echnicalData

Wuhan Linptech Co.,Ltd. FCC ID: 2ACZU-K4R Date: 7/23/2021 Subject: authorization for adding family models To whom it May concern, Statement We would like to confirm the product Self-powered wireless switch with models K4W3, K4W2, K4W1 are same in all respects. Only the model names are different for different market requirement. Yours sincerely, [Signature] [Xiaoke chen] [Manager] [Wuhan Linptech Co.,Ltd.]

Wuhan Linptech Co.,Ltd. FCC ID: 2ACZU-K4R POWER OF ATTORNEY Date: Jul. 23, 2021 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern: We, the undersigned, hereby authorize Waltek Testing Group Co., Ltd. (Philo Zhong) on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Waltek Testing Group Co., Ltd. (Philo Zhong) on our behalf shall have the same effect as acts of our own. This authorization expires on Jul. 22, 2022. This is to advise that we are in full compliance with the Anti-Drug Abuse Act. We, Wuhan Linptech Co.,Ltd. are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Sincerely, Wuhan Linptech Co.,Ltd. Signature Xiaoke chen / Manager Typed name and Title

Wuhan Linptech Co.,Ltd. Date: Jul. 23, 2021 Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2ACZU-K4R Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Schematics Block Diagram Operational Description Schematics.pdf Block Diagram.pdf Operational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Wuhan Linptech Co.,Ltd. Signature Xiaoke chen / Manager Typed name and Title

Appendix- K4RW3-Photos Page 2 of 7 2. Photographs –Constructional Details 2.1. EUT – External View Model K4RW3 FCC ID: 2ACZU-K4R Models: K4RW3 Models: K4RW2 Appendix- K4RW3-Photos Page 3 of 7 Models: K4RW1 Appendix- K4RW3-Photos Page 4 of 7 Appendix- K4RW3-Photos Page 5 of 7

Appendix- K4RW3-Photos Page 6 of 7 2.2. EUT – Internal View Model K4RW3 FCC ID: 2ACZU-K4R ANT Appendix- K4RW3-Photos Page 7 of 7 ======End======

Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Page 1 of 18 TEST REPORT Reference No..................... : WTN21D07068423W V1 FCC ID.............................. : 2ACZU-K4R Applicant.......................... : Wuhan Linptech Co., Ltd. Address............................ : 13 floor, Huagong High-Tech Building, No.876, Luoyu Road, Hongshan District,Wuhan, Hubei 430205, P.R.China Manufacturer.................... : Wuhan Linptech Co., Ltd. Address............................ : 13 floor, Huagong High-Tech Building, No.876, Luoyu Road, Hongshan District,Wuhan, Hubei 430205, P.R.China Product.............................. : Self-powered wireless switch Model(s)........................ : K4RW1, K4RW2, K4RW3 Standards......................... : FCC CFR47 Part 15 Section 15.231 Date of Receipt sample.... : 2021-07-12 Date of Test...................... : 2021-07-12 to 2021-07-21 Date of Issue.................... : 2021-07-27 Test Result....................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Levi Xiao / Project Engineer Daniel Liu /Designated Reviewer Reference No.: WTN21D07068423W V1 Page 2 of 18 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 2 Contents Page 2 CONTENTS ............................................................................................................................................................ 2 3 REVISION HISTORY ............................................................................................................................................ 3 4 GENERAL INFORMATION .................................................................................................................................. 4 4.1 GENERAL DESCRIPTION OF E.U.T.................................................................................................... 4 4.2 DETAILS OF E.U.T. ......................................................................................................................... 4 4.3 TEST MODE .................................................................................................................................... 4 5 EQUIPMENT USED DURING TEST .................................................................................................................. 5 5.1 EQUIPMENTS LIST ........................................................................................................................... 5 5.2 MEASUREMENT UNCERTAINTY ......................................................................................................... 5 5.3 TEST FACILITY ................................................................................................................................ 6 5.4 SUBCONTRACTED ........................................................................................................................... 6 6 TEST SUMMARY .................................................................................................................................................. 7 7 RADIATED SPURIOUS EMISSIONS ................................................................................................................. 8 7.1 EUT OPERATION ............................................................................................................................ 8 7.2 TEST SETUP ................................................................................................................................... 9 7.3 SPECTRUM ANALYZER SETUP ........................................................................................................ 10 7.4 TEST PROCEDURE ........................................................................................................................ 11 7.5 SUMMARY OF TEST RESULTS ........................................................................................................ 12 8 PERIODIC OPERATION .................................................................................................................................... 13 9 EMISSION BANDWIDTH ................................................................................................................................... 16 9.1 TEST PROCEDURE ........................................................................................................................ 16 9.2 TEST RESULT ............................................................................................................................... 16 10 ANTENNA REQUIREMENT .............................................................................................................................. 17 11 PHOTOGRAPHS - CONSTRUCTIONAL DETAILS ...................................................................................... 18 Reference No.: WTN21D07068423W V1 Page 3 of 18 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 3 Revision History Test report No. Date of Receipt sample Date of Test Date of Issue Purpose CommentApproved WTN21D07068423W2021-07-12 2021-07-12 to 2021-07--21 2021-07-21Original - Replaced WTN21D07068423W V1 2021-07-12 2021-07-12 to 2021-07--21 2021-07-27Version 1 Update Valid Reference No.: WTN21D07068423W V1 Page 4 of 18 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn 4 General Information 4.1 General Description of E.U.T. Product: Self-powered wireless switch Model(s): K4RW1, K4RW2, K4RW3 Model differences: Only the model name and appearance are different SRD(433.92MHz): Support Antenna installation: internal permanent antenna Type of Modulation: GFSK Antenna G…

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Appendix- K4RW3-Photos Page 1 of 7 1. Test Setup photos Model K4RW3 FCC ID: 2ACZU-K4R 1.1 Photograph –Test Setup For 30MHz-1000MHz Test Site 1# For Above 1GHz Test Site 2#