2BKFZ-SK-50E-drum monitor speaker

Rev 1/26/2023 (NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 08‐20‐2024 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2BKFZ‐SK‐50 NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, Lili / head engineer NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. Rev 1/26/2023 (NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 08‐20‐2024 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2BKFZ‐SK‐50 NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, Lili / head engineer NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.

NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. No. 335, Jingu Middle Road, Yinzhou District Ningbo China Date: 2024.8.20 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 FRN: 0035839331 FCC ID: 2BKFZ-SK-50 US Agent – Attestation Statement / Part 2.911(d)(7) NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.certifies, that as of August20, 2024, we have designated FCC US Agent, LLC to accept service of process on our behalf for FCC ID: 2BKFZ-SK-50 NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.accepts to maintain an agent of service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. FCC US Agent, LLC, accepts as of the date of the filing of this application, the obligation of being the designated agent for the purpose of accepting service of process on behalf of NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. for FCC ID: 2BKFZ-SK-50 Designated Agent Information: Company Name: FCC US Agent, LLC FRN: 0033402884 Address: 3722 Illinois Avenue, Saint Charles, IL, 60174, USA Contact Person: Tim Payne Phone: 708-571-3148 Email: [email protected] Sincerely, Company: NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. Designated Agent: FCC US Agent, LLC Company Representative:Li li Designated Agent Representative: Tim Payne Signature: Signature:

( NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.) Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: 2BKFZ-SK-50 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram, Schematics, Operational Description Block Diagram .pdf, Schematics .pdf , Operation Description .pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Pursuant to DA04-1705 June 15, 2004 of the Commission’s public notice, we also request temporary confidential treatment of information accompanying this application as outlined below: Short-term confidentiality requested: 180 days Exhibit Type File Name Internal Photos, Test Setup Photos, User Manual Internal Photos .pdf, Test Setup Photos .pdf, User Manual .pdf Sincerely, Li li/head engineer NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.

(NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.) Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Date: August 20, 2024 SUBJECT: FCC Application for FCC ID: 2BKFZ-SK-50 To Whom It May Concern: We, the undersigned, hereby authorize Tony Wei at EMTEK(NINGBO) CO., LTD. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by EMTEK(NINGBO) CO., LTD. on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, Lili / head engineer NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD.

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Label and Label Location PEODUCT: E-drum monitor speaker Model：SK-50 FCC ID: 2BKFZ-SK-50 This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

FCC ID: 2BKFZ-SK-50 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) Frequency Range(MHz) Electric Field Strength(V/m) Magnetic Field Strength(A/m) Power Density(mW/cm 2 ) Average Time (A) Limits for Occupational/Control Exposures 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 300-1500 -- -- F/1500 6 1500-100000 -- -- 1 30 11.1 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=3.1416 R= distance between observation point and center of the radiator in cm 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. mW = 10^( dBm/10) 11.2 Measurement Result Operation Frequency: 2402MHz-2480MHz; Antenna gain: 1.67 dBi; R=20cm Chann el Freq. (MHz) modulati on Measure d power (dBm) Tune-up power (dBm) Max tune-up power (dBm) Antenna Gain Numeric Evaluation result (mW/cm2) Power density Limits (mW/cm2 ) 2402 GFSK -3.98 -4±1 -3 1.47 0.000146463 1 2441 -2.59 -3±1 -2 1.47 0.000184387 1 2480 -1.26 -2±1 -1 1.47 0.000232129 1 2402 pi/4- DQPSK -1.76 -2±1 -1 1.47 0.000232129 1 2441 0.07 0±1 1 1.47 0.000367899 1 2480 1.06 1±1 2 1.47 0.000463158 1 2402 8DPSK -1.52 -2±1 -1 1.47 0.000232129 1 2441 0.42 0±1 1 1.47 0.000367899 1 2480 1.53 1±1 2 1.47 0.000463158 1 *** End of Report ***

ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page1of9 TestingReport CustomerName:NINGBOKINLINELECTRONICTECHNOLOGY CO.,LTD. ProductName:Electronicdrum SampleModel:DED-500/DED-500P/ACE-500/ACE-510/ACE-530 ReferenceStandard:GB/T9410-2008;ANSI/IEEEStd149-1979 IssueDate:2023.4.4 Engineer:Date: Auditor:Date: Approver:Date: ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page2of9 Version VersionNo.DateDescriptionFormulateApproval A02023.4.4Forthefirsttime,formulateJeacksonEason 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 2.4EUTsetupphotooffreespaceOTAtesting.........................................................................6 3.TestResults......................................................................................................................................7 3.1Teststandard.........................................................................................................................7 3.2Testuncertainty.....................................................................................................................7 3.3Testdata................................................................................................................................7 3.3.1Typicalfreespaceefficiencyandgain......................................................................7 3.3.2Typicalfreespaceradiationpattern...........................................................................8 （Thefollowingisblank）................................................................................................................9 ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page3of9 1.GeneralInformation 1.1Generalinformationoftestinginstitutions Name ShenzhenRFI-LABCommunicationTechnologyCo.,Ltd. Address 10/FA,LingyunBld,LiufangRd,BaoanDistrict,SZ Tel 13682621346 E-mail [email protected] Equipment AlltheequipmentusedinthereportisfixedinZoneB,WestSideof1/F,Building1, TingweiIndustrialPark,No.6LiufangRoad,Bao'anDistrict,Shenzhen 1.2Testingprinciple ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page4of9 1.3Testequipment EquipmentModelNo.SerialNo.Manufacturer Calibration date Next calibration date OTATest System RayZone-5000 RFI-LAB-RF -D00 GTS2023.3.142025.3.13 Network Analyzer E5071C RFI-LAB-RF -D01 KEYSIGHT2022.5.132023.5.12 1.4Testenvironment Temperature 23.6°C Humidity 59%RH Pressure 100.13kPa 1.5Statement (1)Thetestresultsinthereportareonlyapplicabletothetestedsamplesandthetestedsamples workundertheenvironmentdescribedinthereport. (2)OnlyShenzhenRFI-LABCommunicationTechnologyCo.,Ltd.havetherighttomodifythe report,andthemodificationinformationshallbeannotatedintherevisionform. (3)Anyobjectiontothisreportshallberaisedwithin30daysafterformalconfirmationofthe report. (4)Thisreportisinvalidifthereisanyevidencethatthesampleinformationprovidedisfalsified. (5)Thereportisinvalidwithoutthesignatureoftheauditorandapprover. ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page5of9 2.SampleInformation 2.1Clientinformation Manufacturer NINGBOKINLINELECTRONICTECHNOLOGYCO.,LTD. Address Room602,MainBuilding,No.531NingheRoad,QiuaiTown, YinzhouDistrict,NingboCity,ZhejiangProvince Contacts / Tel / E-mail / Manufacturer NINGBOKINLINELECTRONICTECHNOLOGYCO.,LTD. 2.2DescriptionofEUT(S) ProductName Electronicdrum SampleModel DED-500/DED-500P/ACE-500/ACE-510/ACE-530 AntennaSize / SerialNo. / AntennaType PCBAntenna TestItem Antennagain;Efficiency;Radiationpattern FrequencyRange 2400-2500MHz ReceivedDate 2023.3.13 TestDate 2023.4.3 Remark / ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page6of9 2.3EUTappearance 2.4EUTsetupphotooffreespaceOTAtesting Planform Frontview ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page7of9 3.TestResults 3.1Teststandard NameParameterMethodStandardno. Mobile communication antenna Antennagain Genericspecification forantennasusedinthe mobilecommunications GB/T 9410-2008 Radiationpattern Antenna Radiationefficiency IEEEStandardTest ProceduresforAntennas ANSI/IEEEStd 149-1979 Gainanddirectivity 3.2Testuncertainty TheuncertaintywascalculatedonthebasisoftheGUMpublishedbyISO,usingthe inclusionfactorofK=2andthe95%confidenceleveltoexpresstheextended uncertainty. ItemUncertainty Antennagain±0.72dB Radiationefficiency±0.72dB 3.3 Testdata 3.3.1Typicalfreespaceefficiencyandgain Frequency/MHz 24002410242024302440245024602470248024902500 PeakGain/dBi 1.671.301.051.010.890.640.610.590.260.01-0.10 Efficiency/% 47.5344.3841.6641.1139.9237.9838.2538.3835.6733.6831.80 ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page8of9 3.3.2Typicalfreespaceradiationpattern (1)X-ZPlane(unit:dBi): (2)Y-ZPlane(unit:dBi): ReportNo.:RFI-LAB-RF-202303-CC17 QP030-E41 Page9of9 (3)X-YPlane(unit:dBi): (4)TypicalFreeSpace3DRadiationPatternat2.4GHz(unit:dBi): ---…

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Report No. ENB2407240027W00201R Page 1 of 65 Ver.1.0 TEST REPORT $二维码$ Product Name : E-drum monitor speaker Model Number : SK-50 FCC ID : 2BKFZ-SK-50 Prepared for : NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. Address : No. 335, Jingu Middle Road, Yinzhou District, Ningbo, China Prepared by : EMTEK (NINGBO) CO., LTD. Address : No. 8, Building 8, Lane 216, Qingyi Road, Ningbo Hi-Tech Zone, Ningbo, Zhejiang, China Tel: +86-574-27907998 Fax: +86-574-27721538 Report Number : ENB2407240027W00201R Date(s) of Tests : July 24, 2024 to August 13, 2024 Date of issue : August 19, 2024 Report No. ENB2407240027W00201R Page 2 of 65 Ver.1.0 Table of Contents 1 TEST RESULT CERTIFICATION ............................................................................................................ 3 2 EUT TECHNICAL DESCRIPTION .......................................................................................................... 5 3 SUMMARY OF TEST RESULT ............................................................................................................... 6 4 TEST METHODOLOGY .......................................................................................................................... 7 4.1 GENERAL DESCRIPTION OF APPLIED STANDARDS ....................................................................... 7 4.2 MEASUREMENT EQUIPMENT USED .................................................................................................. 7 4.3 DESCRIPTION OF TEST MODES ........................................................................................................ 9 4.4 TEST SOFTWARE ................................................................................................................................ 9 5 FACILITIES AND ACCREDITATIONS ................................................................................................. 10 5.1 FACILITIES .......................................................................................................................................... 10 5.2 LABORATORY ACCREDITATIONS AND LISTINGS ........................................................................... 10 6 TEST SYSTEM UNCERTAINTY ........................................................................................................... 11 7 SETUP OF EQUIPMENT UNDER TEST ............................................................................................... 12 7.1 RADIO FREQUENCY TEST SETUP 1 ................................................................................................ 12 7.2 RADIO FREQUENCY TEST SETUP 2 ................................................................................................ 12 7.3 CONDUCTED EMISSION TEST SETUP ............................................................................................ 14 7.4 SUPPORT EQUIPMENT ..................................................................................................................... 14 8 FREQUENCY HOPPING SYSTEM REQUIREMENTS ......................................................................... 15 8.1 STANDARD APPLICABLE .......................................................................................................................... 15 8.2 EUT PSEUDORANDOM FREQUENCY HOPPING SEQUENCE ........................................................................ 15 8.3 EQUAL HOPPING FREQUENCY USE ......................................................................................................... 16 8.4 FREQUENCY HOPPING SYSTEM .............................................................................................................. 16 9 TEST REQUIREMENTS ........................................................................................................................ 17 9.1 20DB BANDWIDTH ............................................................................................................................. 17 9.2 CARRIER FREQUENCY SEPARATION ............................................................................................. 23 9.3 NUMBER OF HOPPING FREQUENCIES ........................................................................................... 29 9.4 AVERAGE TIME OF OCCUPANCY (DWELL TIME) ............................................................................ 31 9.5 MAXIMUM PEAK CONDUCTED OUTPUT POWER ........................................................................... 34 9.6 CONDUCTED SUPRIOUS EMISSION ............................................................................................... 40 9.7 RADIATED SPURIOUS EMISSION ..................................................................................................... 47 9.8 CONDUCTED EMISSION TEST ......................................................................................................... 61 9.9 ANTENNA APPLICATION ................................................................................................................... 64 Report No. ENB2407240027W00201R Page 3 of 65 Ver.1.0 1 TEST RESULT CERTIFICATION Applicant : NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. Address : No. 335, Jingu Middle Road, Yinzhou District, Ningbo, China Manufacturer : NINGBO HAMPBACK CULTURE TECHNOLOGY CO.,LTD. Address : No. 335, Jingu Middle Road, Yinzhou District, Ningbo, China EUT : E-drum monitor speaker Model Name : SK-50 Trademark : N/A Measurement Procedure Used: APPLICABLE STANDARDS STANDARD TEST RESULT FCC 47 CFR Part 2, Subpart J FCC 47 CFR Part 15, Subpart C PASS The above equipment was tested by EMTEK (NINGBO) CO., LTD.The test data, data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C63.10 (2013) and the energy emitted by the sample EUT tested as described in this report is in compliance with the requirements of FCC Rules Part 2 and Part 15.247. The test results of this report relate only to the tested sample identified in this report. Date of Tes…

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