2AOAAMIGHTYBASS50BTBASS AMPLIFIER

尺寸 公差 ±1mm 毫米(mm) 日 期 21-01-05 制图 批准 名 称 Mighty Bass 50BT说明书V4 文件名 视 角 单 位 料 号 光盘号 颜 色 版 本 材 料 作废 图 号 密 级 普通 第( )页/共( )页 说明： * V4,修改内容 * 骑马订装钉 * 尺寸：210(L)x140(W)mm * 材料：封面封底157g双铜,80g书写纸 * 单色印刷 * 直接做货。 内容审 核 V4 标准化 作废 作废 作废 作废 内容详见副页 董海波 Mighty Bass 50BT说明书V4.cdr 黑 1 13 07901-33002-35013 WAR村ING To「educe the risk of fire or electric shock, do not expose this appliance to rain or moisture. CAUTIO付 This device complies with part 15 of the FCC Rules. Operation is subject to the followin g two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, includin g interference that may cause undesired operation. Any chan g es or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment NOTE: This equipment has been tested and found to comply with the limits for a Class B di g ital device, pu『suant to Part 15 of the FCC Rules. These limits are desi g ned to provide reasonable protection a g ainst harmful interference in a residential installation. This equipment g enerates, uses and can radiate radio frequency ener g y and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is 110 g uarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turnin g the equipment off and on, the user is encoura g ed to try to correct the interference by one or m ore of the followin g measures: -Reo「ient or「elocate the receivin g antenna. 廿Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a ci rcuit different from that to which the rece iver is connected. -Consult the deale r or an exper ienced radio/N techn ician for help. The device has been evaluated to meet g eneral RF exposure requirement This equipment should be installed and operated with minimum distance beween 20cm the radiator your body: Use only the supplied antenna. 丛二i���� n :;�n��:�:�;二r:s:��; g ��尸�::r:�t;'!』e���勹 A ;� e e a ::� 点：二 n i��。二：：�=� r �� n �靡 e c � 勹 i �� s � i ��:� tion !' operatin g volta g e and potential risks of electrical shock.

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: BASS AMPLIFIER Model Number: MIGHTY BASS 50BT FCC Identifier: 2AOAAMIGHTYBASS50BT 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: 5/18/2021 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: 5/18/2021 Subject: Request for Confidentiality FCC ID: 2AOAAMIGHTYBASS50BT 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: 5/18/2021 Title:

1 - Page 1 of 7 - 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 1- EUT PHOTO Photo 1 (For model MIGHTY BASS 50BT) Photo 2 1 - Page 2 of 7 - 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] Photo 3 Photo 4 1 - Page 3 of 7 - 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] Photo 5 Photo 6 1 - Page 4 of 7 - 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] Photo 7 Photo 8 1 - Page 5 of 7 - 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] Photo 9 Photo 10 1 - Page 6 of 7 - 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] Photo 11 Photo 12 1 - Page 7 of 7 - 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] Photo 13

location

1 - Page 1 of 9 - 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 1- EUT PHOTO Photo 1 (For model MIGHTY BASS 50BT) Photo 2 1 - Page 2 of 9 - 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 1 - Page 3 of 9 - 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 1 - Page 4 of 9 - 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 1 - Page 5 of 9 - 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 BT & BLE ANT 1 - Page 6 of 9 - 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 1 - Page 7 of 9 - 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 1 - Page 8 of 9 - 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 1 - Page 9 of 9 - 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 17

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] MPE Test Report Report No.: MTi201225011-03E3 Date of issue: May 14, 2021 Applicant: Cherub Technology Co., Ltd Product name: BASS AMPLIFIER Model(s): MIGHTY BASS 50BT FCC ID: 2AOAAMIGHTYBASS50BT Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 6 - Report No.: MTi201225011-03E3 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 6 - Report No.: MTi201225011-03E3 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 RF EXPOSURE EVALUATION ......................................................................................................................... 5 1.1 LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) ........................................................................................ 5 1.2 MEASUREMENT RESULT ......................................................................................................................................... 6 - Page 4 of 6 - Report No.: MTi201225011-03E3 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’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 Manufacturer'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 description Product name ......................... BASS AMPLIFIER Trademark ............................. NUX Model Name .......................... MIGHTY BASS 50BT Serial Model ........................... N/A Standards ............................... N/A Test procedure KDB 447498 D01 v06 Date of Test Date (s) of performance of tests... : Jan. 15, 2021 ~ May 14, 2021 Test Result ............................. : Pass 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. Testing Engineer : (Danny Xu) Technical Manager : (Leo Su) Authorized Signatory : (Tom Xue) - Page 5 of 6 - Report No.: MTi201225011-03E3 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] 1 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) 1.1 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 6 of 6 - Report No.: MTi201225011-03E3 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] 1.2 Measurement Result Operation Frequency: BT GFSK, π/4-DQPSK, 8DPSK: 2402-2480MHz Power density limited: 1mW/ cm 2 Antenna Type: BT Antenna:; BT antenna gain: 1.5dBi R=20cm mW=10^(dBm/10) antenna gain Numeric=10^(dBi/10)= 10^(2.5/10)=1.78 Chann el Freq. (MHz) modulati on conduct ed power Tune-up power (dBm) Max Antenna Evaluat ion result Power density Limits (dBm) tune-up power Gain (mW/c m2 ) (mW/cm 2) (dBm) (mW) (dBi) Numeric 2402 GFSK 7.963 8±1 9 7.943 1.5 1.41 0.0022 1 2441 8.334 8±1 9 7.943 1.5 1.41 0.0022 1 2480 7.174 8±1 9 7.943 1.5 1.41 0.0022 1 2402 π/4- DQPSK 8.026 9±1 10 10.000 1.5 1.41 0.0028 1 2441 9.196 9±1 10 10.000 1.5 1.41 0.0028 1 2480 8.389 9±1 10 10.000 1.5 1.41 0.0028 1 2402 8DPSK 8.403 9±1 10 10.000 1.5 1.41 0.0028 1 2441 9.179 9±1 10 10.000 1.5 1.41 0.0028 1 2480 8.462 9±1 10 10.000 1.5 1.41 0.0028 1 Channel Freq. (MHz) modulation …

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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] Test Report Report No.: MTi201225011-03E2 Date of issue: May 14, 2021 Applicant: Cherub Technology Co., Ltd Product name: BASS AMPLIFIER Model(s): MIGHTY BASS 50BT FCC ID: 2AOAAMIGHTYBASS50BT Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 46 - Report No.: MTi201225011-03E2 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] 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 46 - Report No.: MTi201225011-03E2 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] Table of Contents 1. GENERAL INFORMATION ............................................................................................................................... 6 1.1. DESCRIPTION OF EUT ................................................................................................................................................... 6 1.2. OPERATION CHANNEL LIST .............................................................................................................................................. 6 1.3. TEST CHANNEL LIST ....................................................................................................................................................... 6 1.4. ANCILLARY EQUIPMENT LIST ........................................................................................................................................... 7 1.5. DESCRIPTION OF SUPPORT UNITS .................................................................................................................................... 7 2. SUMMARY OF TEST RESULTS ....................................................................................................................... 8 3. TEST FACILITIES AND ACCREDITATIONS .................................................................................................... 9 3.1. TEST LABORATORY ........................................................................................................................................................ 9 3.2. ENVIRONMENTAL CONDITIONS ........................................................................................................................................ 9 3.3. MEASUREMENT UNCERTAINTY ........................................................................................................................................ 9 3.4. TEST SOFTWARE ........................................................................................................................................................... 9 4. EQUIPMENT LIST ........................................................................................................................................... 10 5. TEST RESULT ................................................................................................................................................. 11 5.1. ANTENNA REQUIREMENT ............................................................................................................................................. 11 5.1.1 Standard Requirement ...................................................................................................................................... 11 5.1.2 EUT Antenna ..................................................................................................................................................... 11 5.2. PEAK OUTPUT POWER TEST ......................................................................................................................................... 12 5.2.1 Limit .................................................................................................................................................................. 12 5.2.2 Test setup .......................................................................................................................................................... 12 5.2.3 Test Procedure ................................................................................................................................................... 12 5.2.4 Te s t Results ........................................................................................................................................................ 12 5.3. CONDUCTED EMISSION ................................................................................................................................................ 15 5.3.1 Limits ................................................................................................................................................................. 15 5.3.2 Te s t Setup .......................................................................................................................................................... 15 5.3.3 Te s t Procedure ................................................................................................................................................... 16 5.3.4 Te s t Results ...........................…

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Model: MIGHTY BASS 50BT Radiated emission Conducted emission