2AOAA-DM-210DIGITAL DRUM KIT

Cherub Technology Co., Ltd Model difference statement Product Name: DIGITAL DRUM KIT Model No.: DM-210, DM-200, DM-200K, DM-200S, DM-200X, DM-210K, DM-210S, DM- 210X We (Cherub Technology Co., Ltd, Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067) hereby state that all the models are the same circuit and RF module, except the appear- ance and model No. Signature: Name / title: Yanjun Meng / Tel: +86 755-26869866 Email: [email protected] Date: 1.12.2021

C5266091_X8_Ed.1 1/1 Letter of Authorization Company: Cherub Technology Co., Ltd Address: Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 Product Name: DIGITAL DRUM KIT Model Number: DM-210, DM-200, DM-200K, DM-200S, DM-200X, DM-210K, DM- 210S, DM-210X FCC Identifier: 2AOAA-DM-210 We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Yanjun Meng Date: 1/18/2021 Title: Signature of applicant:

C5266091_X10_Ed.1 1/1 Cherub Technology Co., Ltd Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: 1/18/2021 Subject: Request for Confidentiality FCC ID: 2AOAA-DM-210 To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits Long-Term Confidentiality Short-Term Confidentiality ID Label/Location No No Attestation Statement No No External Photos No Block Diagram Schematics Test Report No No Test Setup Photos No User’s Manual Internal Photos Parts List / Tune Up RF Exposure Info Operational Description Cover Letter(s) No No SDR Software / Security Info No Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Yanjun Meng Date: 1/18/2021 Title:

1 - Page 1 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. APPENDIX 1: EUT PHOTO Photo 1 (For model DM-210) Photo 2 1 - Page 2 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 3 Photo 4 1 - Page 3 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 5 Photo 6 1 - Page 4 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 7 Photo 8 1 - Page 5 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 9 ----END OF REPORT----

1 - Page 1 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. APPENDIX 1: EUT PHOTO Photo 1 (For model DM-210) Photo 2 1 - Page 2 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 3 Photo 4 1 - Page 3 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 5 Photo 6 1 - Page 4 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 7 Photo 8 1 - Page 5 of 5 - Report No.: MTi201203002-04E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Photo 9 ----END OF REPORT---- PCB antenna

This test report is valid for the tested samples only. It cannot be reproduced except in full without prior written consent of Shenzhen Microtest Co., Ltd. Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. MPE REPORT FCC ID: 2AOAA-DM-210 Date of issue: Dec. 30, 2020 Report number: MTi201203002-04E3 Sample description: DIGITAL DRUM KIT Mo d e l( s ) : DM-210, DM-200, DM-200K, DM-200S, DM-200X, DM-210K, DM- 210S, DM-210X Applicant: Cherub Technology Co., Ltd Address: Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 Date of test: Dec. 10, 2020 to Dec. 30, 2020 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 5 - Report No.: MTi201203002-04E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. TEST RESULT CERTIFICATION Applicant’s name: Cherub Technology Co., Ltd Address: Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 Manufacture's name: Cherub Technology Co., Ltd Address: Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 Factory's name: Cherub Technology Co., Ltd（Zhuhai High-tech Park） Address: No.10, Keji No.9Rd, Tangjiawan Town, Zhuhai National Hi-tech Industrial Development Zone, Zhuhai City, Guangdong Province, China, 519080 Product name: DIGITAL DRUM KIT Trademark: NUX Model and/or type reference: DM-210 Serial model: DM-200, DM-200K, DM-200S, DM-200X, DM-210K, DM-210S, DM-210X RF exposure procedures: KDB 447498 D01 v06 This device described above has been tested by Shenzhen Microtest Co., Ltd and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. Tested by: Demi Mu Dec. 30, 2020 Reviewed by: Leo Su Dec. 30, 2020 Approved by: Tom Xue Dec. 30, 2020 - Page 3 of 5 - Report No.: MTi201203002-04E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. RF EXPOSURE EVALUATION According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) Radiation as specified in §1.1307(b) Limits for Maximum Permissible Exposure (MPE) MPE Calculation Method Friis transmission formula: Pd= (Pout*G)\ (4*pi*R 2 ) Where Pd= Power density in mW/cm2 Pout=output power to antenna in mW G= Numeric gain of the antenna relative to isotropic antenna Pi=3.1415926 R= distance between observation point and center of the radiator in cm(20cm) Pd the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. - Page 4 of 5 - Report No.: MTi201203002-04E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Measurement Result BLE: Operation Frequency: BLE GFSK: 2402-2480MHz BT: Operation Frequency: BT GFSK, π/4-DQPSK, 8DPSK: 2402-2480MHz Power density limited: 1mW/ cm 2 Antenna Type: PCB Antenna; antenna gain: 1.5dBi R=20cm mW=10^(dBm/10) antenna gain Numeric=10^(dBi/10)= 10^(1.5/10)=1.41 BLE: Channel Freq. (MHz) modulation conducted power Tune- up power (dBm) Max Antenna Evaluation result Power density Limits (dBm) tune-up power Gain (mW/cm2 ) (mW/cm2) (dBm) (mW) (dBi) Numeric 2402 GFSK 3.087 4±1 5 3.162 1.5 1.41 0.0009 1 2440 4.641 4±1 5 3.162 1.5 1.41 0.0009 1 2480 4.652 4±1 5 3.162 1.5 1.41 0.0009 1 BT: Channel Freq. (MHz) modulation conducted power Tune- up power (dBm) Max Antenna Evaluation result Power density Limits (dBm) tune-up power Gain (mW/cm2 ) (mW/cm2) (dBm) (mW) (dBi) Numeric 2402 GFSK 4.882 5±1 6 3.981 1.50 1.41 0.0011 1 2441 4.504 5±1 6 3.981 1.50 1.41 0.0011 1 2480 4.567 5±1 6 3.981 1.50 1.41 0.0011 1 2402 π/4- DQPSK 4.297 5±1 6 3.981 1.50 1.41 0.0011 1 2441 5.76 5±1 6 3.981 1.50 1.41 0.0011 1 2480 5.64 5±1 6 3.981 1.50 1.41 0.0011 1 2402 8DPSK 4.426 5±1 6 3.981 1.50 1.41 0.0011 1 2441 5.897 5±1 6 3.981 1.50 1.41 0.0011 1 2480 5.678 5±1 6 3.981 1.50 1.41 0.0011 1 - Page 5 of 5 - Report No.: MTi201203002-04E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Simultaneous transmit BT+BLE=0.0011+0.0009=0.002 Conclusion: For the max result: 0.002≤ 1.0 for 1g SAR, No SAR is required. ----END OF REPORT----

This test report is valid for the tested samples only. It cannot be reproduced except in full without prior written consent of Shenzhen Microtest Co., Ltd. Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Test Report FCC ID: 2AOAA-DM-210 Date of issue: Jan. 11, 2021 Report number: MTi201203002-04E1 Sample description: DIGITAL DRUM KIT Mo d e l( s ) : DM-210, DM-200, DM-200K, DM-200S, DM-200X, DM-210K, DM-210S, DM-210X Applicant: Cherub Technology Co., Ltd Address: Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 Date of test: Dec. 10, 2020 to Dec. 30, 2020 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 45 - Report No.: MTi201203002-04E1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’ an District, Shenzhen, Guangdong, China. Table of Contents 1. GENERAL INFORMATION ................................................................................................................................... 5 1.1. DESCRIPTION OF EUT ................................................................................................................................................... 5 1.2. OPERATION CHANNEL LIST .............................................................................................................................................. 6 1.3. TEST CHANNEL LIST ....................................................................................................................................................... 6 1.4. ANCILLARY EQUIPMENT LIST ........................................................................................................................................... 6 1.5. DESCRIPTION OF SUPPORT UNITS .................................................................................................................................... 6 2. SUMMARY OF TEST RESULTS .......................................................................................................................... 7 3. TEST FACILITIES AND ACCREDITATIONS ...................................................................................................... 8 3.1. TEST LABORATORY ........................................................................................................................................................ 8 3.2. ENVIRONMENTAL CONDITIONS ........................................................................................................................................ 8 3.3. MEASUREMENT UNCERTAINTY ........................................................................................................................................ 8 3.4. TEST SOFTWARE ........................................................................................................................................................... 8 4. EQUIPMENT LIST ................................................................................................................................................. 9 5. TEST RESULT ..................................................................................................................................................... 10 5.1. ANTENNA REQUIREMENT ............................................................................................................................................. 10 5.1.1 Standard Requirement ...................................................................................................................................... 10 5.1.2 EUT Antenna ..................................................................................................................................................... 10 5.2. PEAK OUTPUT POWER TEST ......................................................................................................................................... 11 5.2.1 Limit .................................................................................................................................................................. 11 5.2.2 Test setup .......................................................................................................................................................... 11 5.2.3 Test Procedure ................................................................................................................................................... 11 5.2.4 Test Results ........................................................................................................................................................ 11 5.3. CONDUCTED EMISSION ................................................................................................................................................ 14 5.3.1 Limits ................................................................................................................................................................. 14 5.3.2 Test Setup .......................................................................................................................................................... 14 5.3.3 Test Procedure ................................................................................................................................................... 15 5.3.4 Test Results ........................................................................................................................................................ 15 5.4. RADIATED SPURIOUS EMISSION ...................................................................................................................................... 20 5.4.1 Limits .........................................…

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Model: DM-210 Radiated emission Conducted emission