2AOAA-DM-7DIGITAL DRUM KIT

Cherub Technology Co., Ltd Statement Product Name: DIGITAL DRUM KIT Model No.: DM-7, DM-7X, DM-7S, DM-7K We( Cherub Technology Co., Ltd, address: 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 model no. Position:Technical director Name: Yanjun Meng Signature: Date: 12/30/2019

C5266091_X8_Ed.1 1/1 Letter of Authorization Cherub Technology Co., Ltd 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-7, DM-7X, DM-7S, DM-7K FCC Identifier: 2AOAA-DM-7 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: Meng Yanjun Date: 2019/12/30 Title: Technical director 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: 2019/12/30 Subject: Request for Confidentiality FCC ID: 2AOAA-DM-7 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: Meng Yanjun 2019/12/30 Title: Technical director

- Page 1 of 5 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China APPENDIX 1: EUT PHOTO Photo 1 (For model DM-7) Photo 2 - Page 2 of 5 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 3 Photo 4 - Page 3 of 5 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 5 Photo 6 - Page 4 of 5 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 7 Photo 8 - Page 5 of 5 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 9 ----END OF REPORT----

DIGITAL DRUM KIT Model: DM-7 Trademark:NUX FCC ID: 2A0AA-DM-7 Rating: 9V




, 0.5A Cherub Technology Co., Ltd Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 60.00 mm 3 5 . 0 0 m m FCC ID: 2AOAA-DM-7

- Page 1 of 6 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China APPENDIX 1: EUT PHOTO Photo 1 (For model DM-7) Photo 2 - Page 2 of 6 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 3 Photo 4 - Page 3 of 6 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 5 Photo 6 PCB Antenna - Page 4 of 6 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 7 Photo 8 - Page 5 of 6 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 9 Photo 10 - Page 6 of 6 - Report No.: MTi19092320-4E1-1 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Photo 11 ----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: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China MPE REPORT FCC ID:2AOAA-DM-7 Date of issue: Dec. 18, 2019 Report number: MTi19092320-4E3 Sample description: DIGITAL DRUM KIT Mo d e l( s ) : DM-7, DM-7X, DM-7S, DM-7K 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: Oct. 15, 2019 to Dec. 18, 2019 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 4 - Report No.: MTi19092320-4E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, 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 Product name: DIGITAL DRUM KIT Trademark: NUX Model and/or type reference . : DM-7 Serial model: DM-7X, DM-7S, DM-7K 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. 18, 2019 Reviewed by: Leo Su Dec. 18, 2019 Approved by: Tom Xue Dec. 18, 2019 - Page 3 of 4 - Report No.: MTi19092320-4E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, 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 4 -Report No.: MTi19092320-4E3 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Measurement Result BT: Operation Frequency: BT GFSK, π/4-DQPSK, 8DPSK: 2402-2480MHz Power density limited: 1mW/ cm 2 BLE: Operation Frequency: BLE GFSK: 2402-2480MHz, Power density limited: 1mW/ cm 2 Antenna Type: PCB Antenna; WIFI antenna gain: 1.5dBi R=20cm mW=10^(dBm/10) antenna gain Numeric=10^(dBi/10)= 10^(1.5/10)=1.41 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) Numeri c 2402 GFSK 2.59 3±1 4 2.512 1.5 1.41 0.0007 1 2440 3.04 3±1 4 2.512 1.50 1.41 0.0007 1 2480 2.35 3±1 4 2.512 1.50 1.41 0.0007 1 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 2.43 2±1 3 1.995 1.50 1.41 0.0006 1 2441 2.85 2±1 3 1.995 1.50 1.41 0.0006 1 2480 2.17 2±1 3 1.995 1.50 1.41 0.0006 1 2402 π/4-DQPSK 4.01 4±1 5 3.162 1.50 1.41 0.0009 1 2441 4.316 4±1 5 3.162 1.50 1.41 0.0009 1 2480 3.607 4±1 5 3.162 1.50 1.41 0.0009 1 2402 8DPSK 4.119 4±1 5 3.162 1.50 1.41 0.0009 1 2441 4.54 4±1 5 3.162 1.50 1.41 0.0009 1 2480 3.92 4±1 5 3.162 1.50 1.41 0.0009 1 Conclusion: For the max result: 0.0009≤ 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: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Test Report FCC ID:2AOAA-DM-7 Date of issue: Dec. 25, 2019 Report number: MTi19092320-4E2 Sample description: DIGITAL DRUM KIT Mo d e l( s ) : DM-7, DM-7X, DM-7S, DM-7K 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: Oct. 15, 2019 to Dec. 18, 2019 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 68 - Report No.: MTi19092320-4E2 Tel:(86-755)88850135 Fax: (86-755) 88850136 Web: http://www.mtitest.com E-mail: [email protected] Address: No.102A & 302A, East Block, Hengfang Industrial Park, Xingye Road, Xixiang, Bao'an District, Shenzhen, Guangdong, China Table of Contents 1 GENERAL INFORMATION .......................................................................................................................................... 5 1.1 DESCRIPTION OF EUT ................................................................................................................................................... 5 1.2 OPERATION CHANNEL LIST .............................................................................................................................................. 5 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 ................................................................................................................................................. 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 ................................................................................................................................................ 18 5.3.1 Limits ................................................................................................................................................................. 18 5.3.2 Test setup .......................................................................................................................................................... 18 5.3.3 Test procedure ................................................................................................................................................... 19 5.3.4 Test results......................................................................................................................................................... 19 5.4 RADIATED SPURIOUS EMISSION ...................................................................................................................................... 24 5.4.1 Limits ...............................................................................................…

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Model: DM-7 Radiated emission S Conducted emission