2AOAA-DM-8DIGITAL DRUM KIT

Cherub Technology Co., Ltd Model difference statement Product Name: DIGITAL DRUM KIT Model N o.: DM-8, DM-8X, DM-8Xe, DM-8XS 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 module, except the model name and the appearance of the screen printing content. Signature: Name: Yanjun Meng Title: Tel: +86 755-26869866 Email: [email protected] Date: 12.14.2022

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-8, DM-8X, DM-8Xe, DM-8XS FCC Identifier: 2AOAA-DM-8 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: 12/14/2022 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: 12/14/2022 Subject: Request for Confidentiality FCC ID: 2AOAA-DM-8 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: 12/14/2022 Title:

Page1of5 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Appendix - EUT Photos Model: DM-8 Photo 1 Page2of5 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 2 Photo 3 Page3of5 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 4 Photo 5 Page4of5 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 6 Photo 7 Page5of5 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 8 Photo 9 ----End of Report----

Page1of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Appendix - EUT Photos Model: DM-8 Photo 1 Photo 2 Page2of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 3 Photo 4 Page3of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 5 Photo 6 Page4of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 7 Photo 8 Page5of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 9 Photo 10 Page6of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 11 Photo 12 Page7of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 13 Photo 14 Page8of8 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web:www.mtitest.com E-mail: [email protected] Photo 15 Photo 16 ----End of Report---- ANT

Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] RF EXPOSURE Test Report Report No.: MTi220902008-02E3 Date of issue: 2022-11-29 Applicant: Cherub Technology Co., Ltd Product: DIGITAL DRUM KIT Model(s): DM-8, DM-8X, DM-8Xe, DM-8XS FCC ID: 2AOAA-DM-8 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 5 - Report No.: MTi220902008-02E3 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Instructions 1. The report shall not be partially reproduced without the written consent of the laboratory; 2. The test results of this report are only responsible for the samples submitted; 3. This report is invalid without the seal and signature of the laboratory; 4. This report is invalid if transferred, altered or tampered with in any form without authorization; 5. Any objection to this report shall be submitted to the laboratory within 15 days from the date of receipt of the report. - Page 3 of 5 - Report No.: MTi220902008-02E3 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Test Result Certification 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 Manufacturer: 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: Cherub Technology Co., Ltd (Zhuhai High-tech Park) Address: Room507, Block 1, Nanhai E-Cool, No. 6 Xinghua Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province, China, 518067 Product description Product name: DIGITAL DRUM KIT Trademark: NUX Model name: DM-8 Serial Model: DM-8X, DM-8Xe, DM-8XS Standards: N/A Test procedure: KDB 447498 D01 v06 Date of Test Date of test: 2022-10-20~2022-11-29 Test result: Pass Test Engineer : (Cindy Qin) Reviewed By: : (Leon Chen) Approved By: : (Tom Xue) - Page 4 of 5 - Report No.: MTi220902008-02E3 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] 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/cm 2 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/cm 2 . 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 5 of 5 - Report No.: MTi220902008-02E3 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China. Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Measurement Result BT/BLE: Operation Frequency: 2402-2480MHz, Power density limited: 1mW/ cm 2 Antenna Type: PCB Antenna; WIFI antenna gain: -2.49dBi R=20cm mW=10^(dBm/10) antenna gain Numeric=10^(dBi/10)= 10^(-2.49/10)=0.56 BR+EDR: Channe l Freq. (MHz) modulation conducted power Tune- up power (dBm) Max Antenna Evaluation result Power density Limits (dBm) tune-up power Gain (mW/cm 2 ) (mW/cm 2 ) (dBm) (mW) (dBi) Numeric 2402 GFSK 4.26 4±1 5 3.162 -2.49 0.56 0.0004 1 2441 4.1 4±1 5 3.162 -2.49 0.56 0.0004 1 2480 3.65 4±1 5 3.162 -2.49 0.56 0.0004 1 2402 π/4- DQPSK 4.87 4±1 5 3.162 -2.49 0.56 0.0004 1 2441 4.68 4±1 5 3.162 -2.49 0.56 0.0004 1 2480 4.26 4±1 5 3.162 -2.49 0.56 0.0004 1 2402 8DPSK 5.38 5±1 6 3.981 -2.49 0.56 0.0004 1 2441 5.21 5±1 6 3.981 -2.49 0.56 0.0004 1 2480 4.76 5±1 6 3.981 -2.49 0.56 0.0004 1 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 BLE-1M 4.4 4±1 5 3.162 -2.49 0.56 0.0004 1 2440 4.22 4±1 5 3.162 -2.49 0.56 0.0004 1 2480 3.71 4±1 5 3.162 -2.49 0.56 0.0004 1 2402 BLE-2M 4.22 4±1 5 3.162 -2.49 0.56 0.0004 1 2440 4.05 4±1 5 3.162 -2.49 0.56 0.0004 1 2480 3.55 4±1 5 3.162 -2.49 0.56 0.0004 1 Conclusion: For the max result: 0.0004≤ 1.0 SAR, No SAR is required. ----END OF REPORT----

ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page1of8 TestingReport CustomerName:CherubTechnologyCo.,Ltd ProductName:DIGITALDRUMKIT SampleModel:DM-8,DM-8X,DM-8Xe,DM-8XS ReferenceStandard:GB/T9410-2008;ANSI/IEEEStd149-1979 IssueDate:2022.10.31 Engineer:Date: Auditor:Date: Approver:Date: ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page2of8 Version VersionNo.DateDescriptionFormulateApproval A02022.10.31Forthefirsttime,formulateJeremyEason Contents 1.GeneralInformation.........................................................................................................................3 1.1Generalinformationoftestinginstitutions...........................................................................3 1.2Testingprinciple...................................................................................................................3 1.3Testequipment......................................................................................................................4 1.4Testenvironment...................................................................................................................4 1.5Statement..............................................................................................................................4 2.SampleInformation.........................................................................................................................5 2.1Clientinformation.................................................................................................................5 2.2DescriptionofEUT(S)..........................................................................................................5 2.3EUTappearance....................................................................................................................6 2.4DUTsetupphotooffreespaceOTAtesting........................................................................6 3.TestResults......................................................................................................................................7 3.1Teststandard.........................................................................................................................7 3.2Testuncertainty.....................................................................................................................7 3.3Testdata................................................................................................................................7 3.3.1Typicalfreespaceefficiencyandgain......................................................................7 3.3.2Typicalfreespaceradiationpattern...........................................................................8 （Thefollowingisblank）................................................................................................................8 ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page3of8 1.GeneralInformation 1.1Generalinformationoftestinginstitutions Name ShenzhenRFI-LABCommunicationTechnologyCo.,Ltd. Address 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ Tel 13682621346 E-mail [email protected] Equipment Alltheequipmentusedinthereportisfixedin 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ 1.2Testingprinciple ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page4of8 1.3Testequipment EquipmentModelNo.SerialNo.Manufacturer Calibration date Next calibration date 16probe microwave chamber 3*3*2.5 RFI-LAB-RF -A00 SUNYIELD2021.3.152023.3.14 Network Analyzer E5071C RFI-LAB-RF -A02 Agilent 2022.5.132023.5.12 1.4Testenvironment Temperature 23.2°C Humidity 59%RH Pressure 100.17kPa 1.5Statement (1)Thetestresultsinthereportareonlyapplicabletothetestedsamplesandthetestedsamples workundertheenvironmentdescribedinthereport. (2)OnlyShenzhenRFI-LABCommunicationTechnologyCo.,Ltd.havetherighttomodifythe report,andthemodificationinformationshallbeannotatedintherevisionform. (3)Anyobjectiontothisreportshallberaisedwithin30daysafterformalconfirmationofthe report. (4)Thisreportisinvalidifthereisanyevidencethatthesampleinformationprovidedisfalsified. (5)Thereportisinvalidwithoutthesignatureoftheauditorandapprover. ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page5of8 2.SampleInformation 2.1Clientinformation Name CherubTechnologyCo.,Ltd Address No.10,KejiNo.9Rd,TangjiawanTown,ZhuhaiNationalHi-tech IndustrialDevelopmentZone,ZhuhaiCity,GuangdongProvince,China, 519080 Contacts LIXIAOJUN Tel 13316431064 E-mail [email protected] Manufacturer CherubTechnologyCo.,Ltd(ZhuhaiHigh-techPark） 2.2DescriptionofEUT(S) ProductName DIGITALDRUMKIT SampleModel DM-8,DM-8X,DM-8Xe,DM-8XS AntennaSize / AntennaType PIFAAntenna SerialNo. / TestItem Antennagain;Efficiency;Radiationpattern FrequencyRange 2400MHz-2500MHz ReceivedDate 2022.10.28 TestDate 2022.10.31 Remark ThelengthoftheRFcableis40mm ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page6of8 2.3EUTappearance 2.4DUTsetupphotooffreespaceOTAtesting Planform Frontview ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page7of8 3.TestResults 3.1Teststandard NameParameterMethodStandardno. Mobile communication antenna Antennagain Genericspecification forantennasusedin themobile communications GB/T 9410-2008 Radiationpattern Antenna Radiationefficiency IEEEStandardTest Proceduresfor Antennas ANSI/IEEEStd 149-1979 Gainanddirectivity 3.2Testuncertainty TheuncertaintywascalculatedonthebasisoftheGUMpublishedbyISO,usingthe inclusionfactorofK=2andthe95%confidenceleveltoexpresstheextended uncertainty. ItemUncertainty Antennagain±1dB Radiationefficiency±10% 3.3 Testdata 3.3.1Typicalfreespaceefficiencyandgain Frequency/MHz 24002410242024302440245024602470248024902500 PeakGain/dBi -2.49-2.7-3.11-3.36-3.74-3.68-3.86-4.12-4.26-4.06-4.27 Efficiency/% 8.858.538.097.747.237.397.116.806.616.786.48 ReportNo.:RFI-LAB-RF-202210-JJ26 QP030-E11 Page8of8 3.3.2Typicalfreespaceradiationpattern 3DRadiationPatternat2400MHz: -------------------------------------------------End------------------------------------------------ （Thefollowingisblank）

Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136Web: www.mtitest.comE-mail: [email protected] Test Report Report No.: MTi220902008-02E2 Date of issue: 2022-11-29 Applicant: Cherub Technology Co., Ltd Product: DIGITAL DRUM KIT Model(s): DM-8, DM-8X, DM-8Xe, DM-8XS FCC ID: 2AOAA-DM-8 Shenzhen Microtest Co., Ltd. http://www.mtitest.com Page2of69Report No.: MTi220902008-02E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Instructions 1. This test report shall not be partially reproduced without the written consent of the laboratory. 2. The test results in this test report are only responsible for the samples submitted 3. This test report is invalid without the seal and signature of the laboratory. 4. This test report is invalid if transferred, altered, or tampered with in any form without authorization. 5. Any objection to this test report shall be submitted to the laboratory within 15 days from the date of receipt of the report. Page3of69Report No.: MTi220902008-02E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Tel: (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Table of contents 1 General Description........................................................................................................................5 1.1 Description of the EUT .......................................................................................................................................5 1.2 Description of test modes...................................................................................................................................5 1.3 Test conditions....................................................................................................................................................7 1.4 Description of support units................................................................................................................................7 2 Measurement uncertainty...............................................................................................................8 3 Summary of Test Result..................................................................................................................9 4 Test Laboratory .............................................................................................................................10 5 Equipment List ..............................................................................................................................11 6 Test Result.....................................................................................................................................12 6.1 Antenna requirement........................................................................................................................................12 6.2 AC power line conducted emissions.................................................................................................................13 6.3 Radiated spurious emission .............................................................................................................................18 6.4 20dB emission bandwidth ................................................................................................................................27 6.5 Maximum conducted output power ..................................................................................................................28 6.6 Carrier frequency separation............................................................................................................................29 6.7 Time of occupancy............................................................................................................................................30 6.8 Number of hopping channels ...........................................................................................................................31 6.9 Band edge (Conducted) ...................................................................................................................................32 6.10 Conducted spurious emissions ......................................................................................................................33 Appendix A: 20dB Emission Bandwidth.............................................................................................34 Appendix B: Maximum conducted output power...............................................................................38 Appendix C: Carrier frequency separation.........................................................................................42 Appendix D: Time of occupancy.........................................................................................................44 Appendix E: Number of hopping channels.........................................................................................51 Appendix F: Band edge measurements..............................................................................................53 Appendix G: Conducted Spurious Emission......................................................................................58 Photographs of the Test Setup............................................................................................................68 Photographs of the EUT.......................................................................................................................69 Page4of69Report No.: MTi220902008-02E2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Sh…

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Page 1 of 2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Appendix - Test Setup Photos Model: DM-8 Radiated emissions – Below 1 GHz Radiated emissions – Above 1 GHz Page 2 of 2 Address: 101, No. 7, Zone 2, Xinxing Industrial Park, Fuhai Avenue, Xinhe Community, Fuhai Street, Bao’an District, Shenzhen, Guangdong, China Te l : (86-755)88850135 Fax: (86-755) 88850136 Web: www.mtitest.com E-mail: [email protected] Conducted emissions ----End of Report----