2AR8X-MM731DCooler Master MM731 Dongle

Cooler Master Technology Inc. Agent Authorization Company: Cooler Master Technology Inc. Address: 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist., New Taipei City, 23586 Taiwan Product Name: Cooler Master MM731 Dongle Model Number(s): MM-731-D Product Description: Cooler Master MM731 Dongle 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: Apr. 15, 2021 Name: Jane Cai Title: Cooler Master Peripheral BU LB Company: Cooler Master Technology Inc.

Cooler Master Technology Inc. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: Apr. 15, 2021 Subject; Request for Confidentiality FCC ID: 2AR8X-MM731D 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 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: Jane Cai Title: Cooler Master Peripheral BU LB

Annex A External Photos Test Model No.: MM-731-D Page 1 of 3 Test Model No.: MM-731-D Page 2 of 3 Test Model No.: MM-731-D Page 3 of 3

FCC ID LABEL: Ca. 3mm x 7mm Label Location FCC ID: 2AR8X-MM731D

Annex B Internal Photo Test Model No.: MM-731-D Page 1 of 2 Antenna Test Model No.: MM-731-D Page 2 of 2

Page 1 of 28 Report No.: HK2103090626-E FCC TEST REPORT Test report On Behalf of Cooler Master Technology Inc. For Cooler Master MM731 Dongle Model No.: MM-731-D FCC ID: 2AR8X-MM731D Prepared for : Cooler Master Technology Inc. 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist., New Taipei City, 23586 Taiwan Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen, China Date of Test: Mar. 09, 2021 ~Apr. 12, 2021 Date of Report: Apr. 12, 2021 Report Number: HK2103090626-E Page 2 of 28 Report No.: HK2103090626-E TEST RESULT CERTIFICATION Applicant’s name ................. : Cooler Master Technology Inc. Address ................................. : 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist., New Taipei City, 23586 Taiwan Manufacture's Name ............ : CHUAND ELECTRONIC & TECHNOLOGY CO., LTD. Address ................................. : Sijia Industrial Zone, Shijie Town, Dongguan City, P. R. China Product description Trade Mark: Cooler Master Product name ........................... : Cooler Master MM731 Dongle Model and/or type reference : MM-731-D 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 ............. : Mar. 09, 2021 ~Apr. 12, 2021 Date of Issue ........................................... : Apr. 12, 2021 Test Result .............................................. : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou ) Page 3 of 28 Report No.: HK2103090626-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 13 4.1. Radiation Limit 13 4.2. Test Setup 13 4.3. Test Procedure 14 4.4. Test Result 14 5. BAND EDGE 20 5.1. Limits 20 5.2. Test Procedure 20 5.3. Test Result 21 6. OCCUPIED BANDWIDTH MEASUREMENT 23 6.1. Test Setup 23 6.2. Test Procedure 23 6.3. Measurement Equipment Used 23 6.4. Test Result 23 7. ANTENNA REQUIREMENT 25 8. PHOTOGRAPH OF TEST 26 9. PHOTOS OF THE EUT 28 Page 4 of 28 Report No.: HK2103090626-E ** Modifited History ** Revison Description Issued Data Remark Revsion 1.0 Initial Test Report Release Apr. 12, 2021 Jason Zhou Page 5 of 28 Report No.: HK2103090626-E 1. TEST SUMMARY 1.1. Test Procedures And Results DESCRIPTION OF TEST SECTION NUMBERRESULT CONDUCTED EMISSIONS TEST 15.207 COMPLIANT 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 ： 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen, China 1.3. Measurement Uncertainty Measurement Uncertainty Conducted Emission Expanded Uncertainty =2.71dB, k=2 Radiated emission expanded uncertainty(9kHz-30MHz) = 4.26dB, 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 28 Report No.: HK2103090626-E 2. GENERAL INFORMATION 2.1. General Description Of EUT Equipment Cooler Master MM731 Dongle Model Name MM-731-D Serial Model N/A Model Difference N/A FCC ID 2AR8X-MM731D Antenna Type PCB Antenna Antenna Gain 0dBi Operation frequency 2403-2475MHz Number of Channels 38CH Modulation Type GFSK Power Source DC 5V from USB Power Rating DC 5V from USB Page 7 of 28 Report No.: HK2103090626-E 2.1.1. Carrier Frequency of Channels Channel Frequency (MHz) Channel Frequency (MHz) Channel Frequency (MHz) 1 2403 14 2427 27 2453 2 2404 15 2429 28 2455 3 2405 16 2431 29 2457 4 2407 17 2433 30 2459 5 2409 18 2435 31 2461 6 2411 19 2437 32 2463 7 2413 20 2439 33 2465 8 2415 21 2441 34 2467 9 2417 22 2443 35 2469 10 2419 23 2445 36 2471 11 2421 24 2447 37 2473 12 2423 25 2449 38 2475 13 2425 26 2451 2.2. Operation of EUT during testing Operating Mode The mode is used: Transmitting mode Low Channel: 2403MHz Middle Channel: 2441MHz High Channel: 2475MHz Page 8 of 28 Report No.: HK2103090626-E 2.3. Description Of Test Setup Operation of EUT during conducted testing and radiation below 1GHz testing: AC Plug Operation of EUT during radiation above 1GHz testing: PC information Model: ThinkPad X220i Input: 20V, 3.25A/4.5A 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. PC EUT PC EUT Page 9 of 28 Report No.: HK2103090626-E 2.4. Measurement Instruments List Item Equipment Manufacturer Model No. Serial No…

Text truncated - open the document above for the full version.

Test model：MM-731-D Radiated Emission Conducted Power Line Emission test