2AURQ-MD600ALPHAMECHANICAL KEYBOARD

MISTEL CO LTD Agent Authorization Company: MISTEL CO LTD Address: Rm.4,10F.,No.17,Ln.91,Sec.1,Neihu Rd., Neihu Dist., Taipei City 114, Taiwan, China Product Name: MECHANICAL KEYBOARD Model Number(s): MD600 ALPHA, MD600 ALPHA RGB, MD600 ALPHA RGB BT, MD600 ALPHA BT, MD650 ALPHA RGB, MD680 ALPHA RGB Product Description: MECHANICAL KEYBOARD 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: 2022-12-05 Name: JAMES CHANG Title: Manager Company: MISTEL CO LTD

MISTEL CO LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2022/12/05 Subject; Request for Confidentiality FCC ID: 2AURQ-MD600ALPHA 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 Operational Description In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuantto KDB 726920 D01. 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: JAMES CHANG Title: Manager

MISTEL CO LTD Model Difference Data：2022.12.05 Product description: MECHANICAL KEYBOARD Model name: MD600 ALPHA, MD600 ALPHA RGB, MD600 ALPHA RGB BT, MD600 ALPHA BT, MD650 ALPHA RGB, MD680 ALPHA RGB Trade Name: MISTEL FCC ID: 2AURQ-MD600ALPHA All the model are the same circuit and RF module, except model names . Regards Sincerely Client’s signature : Client’s name / title : JAMES CHANG（Manager） Contact information / address：Rm.4,10F.,No.17,Ln.91,Sec.1,Neihu Rd., Neihu Dist., Taipei City 114, Taiwan, China

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Model: MD600 ALPHA External Photos Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 4

Label Location

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122003RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 6 Model: MD600 ALPHA Internal Photos Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122003RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 6 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122003RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 6 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122003RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 6 Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122003RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 5 of 6 ant Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122003RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 6 of 6

Shenzhen CTB Testing Co., Ltd. FCC ID: 2AURQ-MD600ALPHA Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)]·[√f(GHZ)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, where: • f(GHZ) is the RF channel transmit frequency in GHz • Power and distance are rounded to the nearest mW and mm before calculation • The result is rounded to one decimal place for comparison When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. BLE: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 0.902 1.23 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.44 0.445 1.11 0±1 1.00 1.26 <5 0.39330 3.00 YES 2.480 0.437 1.11 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK Conclusion: For the max result : 0.39651≤ FCC Limit 3.0 for 1g SAR.

Antenna Specifications Type :PCB antenna 1. Antenna Information 2.Radiation Pattern

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283Web: http://www.ctb-lab.net Page 1 of 35 TEST REPORT Compiled by: Reviewed by: Approved by: Chen Zheng 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: MECHANICAL KEYBOARD FCC ID: 2AURQ-MD600ALPHA Trademark: MISTEL Model Number: MD600 ALPHA, MD600 ALPHA RGB, MD600 ALPHA RGB BT, MD600 ALPHA BT, MD650 ALPHA RGB, MD680 ALPHA RGB Prepared For: MISTEL CO LTD Address: Rm.4,10F.,No.17,Ln.91,Sec.1,Neihu Rd., Neihu Dist., Taipei City 114, Taiwan, China Manufacturer: DONGGUAN SOLIDTEK ELECTRONICS CO,.LTD. Address: TIANXINVILLAGE,QIAOTOU TOWN,DONGGUAN CITY,GUANGDONG PROVINCE,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: Nov. 17, 2022 Sample tested Date: Nov. 17, 2022 to Nov. 22, 2022 Issue Date: Nov. 22, 2022 Report No.: CTB221122006RFX Te s t Standards FCC Part15.247 ANSI C63.10:2013 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 35 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 ................................................................................ 10 6.1 Block Diagram Of Test Setup ......................................................................................................... 10 6.2 Limit ................................................................................................................................................ 10 6.3 Test procedure ............................................................................................................................... 10 6.4 Test Result ..................................................................................................................................... 12 7. RADIATED SPURIOUS EMISSION ............................................................................................. 14 7.1 Block Diagram Of Test Setup ......................................................................................................... 14 7.2 Limit ................................................................................................................................................ 14 7.3 Test procedure ............................................................................................................................... 15 7.4 Test Result ..................................................................................................................................... 16 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ............................................... 23 8.1 Block Diagram Of Test Setup ......................................................................................................... 23 8.2 Limit ................................................................................................................................................ 23 8.3 Test procedure ............................................................................................................................... 23 8.4 Test Result ..................................................................................................................................... 24 9. COUDUCTED OUTPUT POWER ..................................................…

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Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: MD600 ALPHA Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB221122006RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions