2AYF7-K31G2.4 G Wireless Keyboard Set

DongGuan Zhongxin Electronic Technology Co.,Ltd. Agent Authorization Company: DongGuan Zhongxin Electronic Technology Co.,Ltd. Address: 18 Yinhe San Road,Qiaotou Town, Dongguan City, China Product Name: 2.4 G Wireless Keyboard Set Model Number(s): K31G, K32G, K35G Product Description: 2.4 G Wireless Keyboard Set 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: Jul. 01, 2021 Name: He Luo Title: Manager Company: DongGuan Zhongxin Electronic Technology Co.,Ltd.

DongGuan Zhongxin Electronic Technology Co.,Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: Jul. 01, 2021 Subject; Request for Confidentiality FCC ID: 2AYF7-K31G 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: He Luo Title: Manager

Model Difference Declaration To Whom It May Concern, We, DongGuan Zhongxin Electronic Technology Co.,Ltd.(2.4 G Wireless Keyboard Set ) Trademark:N/A; Model Number: K31G, K32G, K35G All model’s the function, software and electric circuit are the same, only with a product color, appearance and model named different. Test sample model: K31G. Please contact me if you have any question. Date: Jul. 01, 2021 Name: He Luo Title: Manager Signature of applicant:

Annex A External Photos Report No.:HK2106091828-E Page 1 of 3 Report No.:HK2106091828-E Page 2 of 3 Report No.:HK2106091828-E Page 3 of 3

FCC ID LABEL: Ca. 1cm x 2cm Label Location Model No.: K31G FCC ID: 2AYF7-K31G

Annex B Internal Photo Report No.:HK2106091828-E Page 1 of 3 Report No.HK2106091828-E Page 2 of 3 Antenna Report No.HK2106091828-E Page 3 of 3

Page 1 of 26 Report No.: HK2106091828-E FCC TEST REPORT Test report On Behalf of DongGuan Zhongxin Electronic Technology Co.,Ltd. For 2.4 G Wireless Keyb oard Set Model No.: K31G, K32G, K35G FCC ID: 2AYF7-K31G Prepared for : DongGuan Zhongxin Electronic Technology Co.,Ltd. 18 Yinhe San Road,Qiaotou Town, Dongguan City, China Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Date of Test: Jun. 18, 2021 ~ Jun. 25, 2021 Date of Report: Jun. 25, 2021 Report Number: HK2106091828-E Page 2 of 26 Report No.: HK2106091828-E TEST RESULT CERTIFICATION Applicant’s name ................. : Don gGuan Zhongxin Electronic Technology Co.,Ltd. Address ................................. : 18 Yinhe San Road,Qiaotou Town, Dongguan City, China Manufacture's Name ............ : DongGuan Zhongxin Electronic Technology Co.,Ltd. Address ................................. : 18 Yinhe San Road,Qiaotou Town, Dongguan City, China Product description Trade Mark: N/A Product name ........................... : 2.4 G Wireless Keyboard Set Model and/or type reference : K31G, K32G, K35G Standards ............................. : FCC Rules and Regulations Part 15 Subpart C Section 15.249 ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Date of Test ............................................ : Date (s) of performance of tests ............. : Jun. 18, 2021 ~ Jun. 25, 2021 Date of Issue ........................................... : Jun. 25, 2021 Test Result .............................................. : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou ) Page 3 of 26 Report No.: HK2106091828-E Table of Contents Page 1 . Test Summary 5 1.1 . Test Procedures And Results 5 1.2 . Test Facility 5 1.3 . Measurement Uncertainty 5 2 . General Information 6 2.1 . General Description Of EUT 6 2.2 . Operation of EUT during testing 7 2.3 . Description of Test Setup 8 2.4 . Measurement Instruments List 9 3 . Conducted Emissions Test 10 3.1. Conducted Power Line Emission Limit 10 3.2. Test Setup 10 3.3. Test Procedure 10 3.4. Test Result 11 4. Radiated Emission Test 12 4.1. Radiation Limit 12 4.2. Test Setup 12 4.3. Test Procedure 13 4.4. Test Result 13 5. Band Edge 19 5.1. Limits 19 5.2. Test Procedure 19 5.3. Test Result 20 6. Occupied Bandwidth Measurement 22 6.1. Test Setup 22 6.2. Test Procedure 22 6.3. Measurement Equipment Used 22 6.4. Test Result 22 7. Antenna Requirement 24 8. Photograph of Test 25 9. Photos of the EUT 26 Page 4 of 26 Report No.: HK2106091828-E ** Modified History ** Revision Description Issued Data Remark Revision 1.0 Initial Test Report Release Jun. 25, 2021 Jason Zhou Page 5 of 26 Report No.: HK2106091828-E 1. Test Summary 1.1. Test Procedures And Results DESCRIPTION OF TEST SECTION NUMBERRESULT CONDUCTED EMISSIONS TEST 15.207 N/A RADIATED EMISSION TEST 15.249(a) /15.209 COMPLIANT BAND EDGE 15.249(d)/15.205 COMPLIANT OCCUPIED BANDWIDTH MEASUREMENT 15.215（c） COMPLIANT ANTENNA REQUIREMENT 15.203 COMPLIANT 1.2. Test Facility Te s t F i r m ： Shenzhen HUAK Testing Technology Co., Ltd. Address ： 1-2/F., Building B2, Junfeng Zhongcheng Zhizao Innovation Park, Heping, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China 1.3. Measurement Uncertainty Measurement Uncertainty Conducted Emission Expanded Uncertainty =2.71dB, k=2 Radiated emission expanded uncertainty(9kHz-30MHz) = 3.90dB, k=2 Radiated emission expanded uncertainty(30MHz-1000MHz)= 3.90dB, k=2 Radiated emission expanded uncertainty(Above 1GHz) = 4.28dB, k=2 Page 6 of 26 Report No.: HK2106091828-E 2. General Information 2.1. General Description Of EUT Equipment 2.4 G Wireless Keyboard Set Model Name K31G Serial Model K32G, K35G Model Difference All model’s the function, software and electric circuit are the same, only with a product color, appearance and model named different. Test sample model: K31G. FCC ID 2AYF7-K31G Antenna Type PCB Antenna Antenna Gain 2.75dBi Operation frequency 2403.85-2479.85MHz Number of Channels 16CH Modulation Type GFSK Power Source DC 3V from battery Power Rating DC 3V from battery Page 7 of 26 Report No.: HK2106091828-E 2.1.1. Carrier Frequency of Channels Channel Frequency (MHz) Channel Frequency (MHz) 01 2403.8511 2459.85 02 2426.85 12 2473.85 03 2441.8513 2419.85 04 2463.8514 2439.85 05 2407.8515 2453.85 06 2422.8516 2479.85 07 2445.85 08 2466.85 09 2414.85 10 2436.85 2.2. Operation of EUT during testing Operating Mode The mode is used: Transmitting mode Low Channel: 2403.85MHz Middle Channel: 2441.85MHz High Channel: 2479.85MHz Page 8 of 26 Report No.: HK2106091828-E 2.3. Description of Test Setup Operation of EUT during Radiation testing: The sample was placed (0.8m below 1GHz, 1.5m above 1GHz) above the ground plane of 3m chamber. Measurements in both horizontal and vertical polarities were performed. During the test, each emission was maximized by: having the EUT continuously working, investigated all operating modes, rotated about all 3 axis (X, Y & Z) and considered typical configuration to obtain worst position, manipulating interconnecting cables, rotating the turntable, varying antenna height from 1m to 4m in both horizontal and vertical polarizations. The emissions worst-case are shown in Test Results of the following pages. The worst case is X position. EUT Page 9 of 26 Report No.: HK2106091828-E 2.4. Measurement Instruments List Item Equipment Manufacturer Model No. Serial No. Last Cal. Cal. Interval 1. L.I.S.N. Artificial Mains Network R&S ENV2…

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Test Model：K31G Radiated Emission