2AOAA-MIGHTYAIRWireless Stereo Modelling Guitar and Bass Amplifier with Bluetooth

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: Wireless Stereo Modelling Guitar and Bass Amplifier with Bluetooth Model Number: MIGHTY AIR, MIGHTY GO FCC Identifier: 2AOAA-MIGHTYAIR 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: 12/30/2019 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: 12/30/2019 Subject: Request for Confidentiality FCC ID: 2AOAA-MIGHTYAIR 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 12/30/2019 Title: /

- Page 1 of 6 - Report No.: MTi19102815-4E1-1 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 Photo 2 (For model MIGHTY AIR) Serial model: MIGHTY GO - Page 2 of 6 - Report No.: MTi19102815-4E1-1 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.: MTi19102815-4E1-1 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 6 - Report No.: MTi19102815-4E1-1 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.: MTi19102815-4E1-1 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.: MTi19102815-4E1-1 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----

- Page 1 of 10 - Report No.: MTi19102815-4E1-1 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 MIGHTY AIR) Photo 2 - Page 2 of 10 - Report No.: MTi19102815-4E1-1 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 10 - Report No.: MTi19102815-4E1-1 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 Photo 1 PCB Antenna - Page 4 of 10 - Report No.: MTi19102815-4E1-1 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 10 - Report No.: MTi19102815-4E1-1 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 10 - Report No.: MTi19102815-4E1-1 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 Photo 12 - Page 7 of 10 - Report No.: MTi19102815-4E1-1 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 13 Photo 14 - Page 8 of 10 - Report No.: MTi19102815-4E1-1 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 15 Photo 16 - Page 9 of 10 - Report No.: MTi19102815-4E1-1 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 17 Photo 18 - Page 10 of 10 - Report No.: MTi19102815-4E1-1 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 19 Photo 20 ----END OF REPORT----

RF EXPOSURE REPORT FCC ID:2AOAA-MIGHTYAIR Date of issue: Dec. 14, 2019 Report Number: MTi19102815-4E3 Sample Description: Wireless Stereo Modelling Guitar and Bass Amplifier with Bluetooth Model(s): MIGHTY AIR, MIGHTY GO 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: Nov. 07, 2019 to Dec. 14, 2019 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 4- Report No.: MTi180427E107 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: Wireless Stereo Modelling Guitar and Bass Amplifier with Bluetooth Model and/or type reference: MIGHTY AIR Serial Model: MIGHTY GO 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: Danny Xu Dec. 14, 2019 Reviewed by: Leo Su Dec. 14, 2019 Approved by: Tom Xue Dec. 14, 2019 - Page 3 of 4- Report No.: MTi180427E107 1. Standalone SAR test exclusion considerations Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions. The minimum test separation distance defined in 4.1 f) is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander. To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified, typically in the SAR measurement or SAR analysis report, by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting are required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions. a) For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR, where  f (GHz) is the RF channel transmit frequency in GHz  Power and distance are rounded to the nearest mW and mm before calculation  The result is rounded to one decimal place for comparison  The values 3.0 and 7.5 are referred to as numeric thresholds in step b) below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm, and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 4.1 f) is applied to determine SAR test exclusion. b) For 100 MHz to 6 GHz and test separation distances > 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following (also illustrated in Appendix B): 1) {[Power allowed at numeric threshold for 50 mm in step a)] + [(test separation distance – 50 mm)·(f(MHz)/150)]} mW, for 100 MHz to 1500 MHz 2) {[Power allowed at numeric threshold for 50 mm in step a)] + [(test separation distance – 50 mm)·10]} mW, for > 1500 MHz and ≤ 6 GHz c) For frequencies below 100 MHz, the following may be considered for SAR test exclusion (also illustrated in Appendix C): 1) For test separation distances > 50 mm and < 200 mm, the power threshold at the corresponding test separation distance at 100 MHz in step b) is multiplied by [1 + log(100/f(MHz))] 2) For test separation distances ≤ 50 mm, the power threshold determined by the equation in c) 1) for 50 mm and 100 MHz is multiplied by ½ 3) SAR measurement procedures are not established below 100 MHz. - Page 4 of 4- Report No.: MTi180427E107 When SAR test exclusion cannot be applied, a KDB inquiry is required to determine SAR evaluation requirements for any SAR test results below 100 MHz to be acceptable. 2. SAR Test Exclucsion Thresholds We use 5mm as separation distance to calculated. Bluetooth DSS: Transmit Frequenc y (GHz) Mode Measured Power (dBm) Tune-up power (dBm) Max tune- up Result 1g SAR power(dBm) calculation 2.402 GFSK 2.091 3±1 4 0.7786 3 2.441 3.320 3±1 4 0.7849 3 2.48 3.258 3±1 4 0.7911 3 2.402 π/4-DQPSK 3.455 4±1 5 0.9802 3 2.441 4.899 4±1 5 0.9881 3 2.48 4.940 4±1 5 0.9960 3 2.402 8DPSK 3.932 4±1 5 0.9802 3 2.441 4.829 4±1 5 0.9881 3 2.48 4.810 4±1 5 0.9960 3 Bluetooth DTS: Transmit Frequenc y (GHz) Mode Measured Power (dBm) Tune-up power (dBm) Max tune- up Result 1g SAR power(dBm) calculation 2.402 GFSK -4.584 -4±1 -3 0.1554 3 2.44 -3.047 -4±1 -3 0.1566 3 2.48 -3.052 -4±1 -3 0.1579 3 Conclusion: For the max result: 0.9960≤ 3.0 for …

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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-MIGHTYAIR Date of issue: Dec. 16, 2019 Report number: MTi19102815-4E2 Sample description: Wireless Stereo Modelling Guitar and Bass Amplifier with Bluetooth Model(s): MIGHTY AIR, MIGHTY GO 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: Nov. 07, 2019 to Dec. 16, 2019 Shenzhen Microtest Co., Ltd. http://www.mtitest.com - Page 2 of 46 - Report No.: MTi19102815-4E2 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 TEST ......................................................................................................................................... 11 5.2.1 Limit .................................................................................................................................................................. 11 5.2.2 Test setup .......................................................................................................................................................... 11 5.2.3 Test Procedure ................................................................................................................................................... 11 5.2.4 EUT Operation Condition .................................................................................................................................. 11 5.2.5 Test Results ........................................................................................................................................................ 11 5.3. CONDUCTED EMISSION ................................................................................................................................................ 14 5.3.1 Limits ................................................................................................................................................................. 14 5.3.2 Test Setup .......................................................................................................................................................... 15 5.3.3 Test Procedure ................................................................................................................................................... 16 5.3.4 Test Results ........................................................................................................................................................ 16 5.4. RADIATED SPURIOUS EMISSION ..................................................................................…

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Model: MIGHTY AIR Radiated emission Conducted emission