2AIG5PWMA4004BTAMPLIFIER

Warning Statement 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. Any Changes 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 digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee 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 turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -Reorient or relocate the receiving antenna. -Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help. Installed and operated with minimum distance between 20cm the radiator. your body: Use only the supplied antenna.

GuangZhou FirstSound Electronics Co., Ltd. Family models declaration letter. 2020-06-05 We GuangZhou FirstSound Electronics Co., Ltd. Of A5 BUILDING, 19# JIANGSHI ROAD, JIANGGAO GUNAGZHOU,GUANGDONG CHINA Product: AMPLIFIER Model Name: PWMA4004BT Serial Model: PWMA5000BT, PWMA698BT, PWMA798BT,PWMA5000BA All the model are the same circuit and RF module,except model names. Thanks Sincerely, Signature Name: CHEN LI Date: 2020-06-05 Title: Manager

GuangZhou FirstSound Electronics Co., Ltd. (2020-06-05) MET Laboratories, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (AMPLIFIER / PWMA4004BT, PWMA5000BT, PWMA698BT, PWMA798BT,PWMA5000BA / FCC ID: 2AIG5PWMA4004BT) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the (Block Diagram/Schematics/Operational Description) required to be submitted with this application be permanently withheld from public review. Please contact me if there is any information you may need. Sincerely, Client’s signature : Client’s name / title : CHEN LI / Manager Contact information / address: A5 BUILDING, 19# JIANGSHI ROAD, JIANGGAO GUNAGZHOU,GUANGDONG CHINA

GuangZhou FirstSound Electronics Co., Ltd. (2020-06-05) Eurofins MET Labs 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Global United Technology Services Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Client’s signature : Client’s name / title : CHEN LI / Manager Contact information / address: A5 BUILDING, 19# JIANGSHI ROAD, JIANGGAO GUNAGZHOU,GUANGDONG CHINA

4cm FCC ID: 2AIG5PWMA4004BT 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 Label Location 2 cm

Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 33 of 36 BT ANT Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 34 of 36 Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 35 of 36 Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 36 of 36 ------End------

Global United Technology Services Co., Ltd. Report No.: GTS202005000200 Authorized Signature: Robinson Lo Laboratory Manager This results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Page 1 of 37 + FCC REPORT Applicant: GuangZhou FirstSound Electronics Co., Ltd. Address of Applicant: A5 BUILDING, 19# JIANGSHI ROAD, JIANGGAO GUNAGZHOU,GUANGDONG CHINA Manufacturer: GuangZhou FirstSound Electronics Co., Ltd. Address of Manufacturer: A5 BUILDING, 19# JIANGSHI ROAD, JIANGGAO GUNAGZHOU,GUANGDONG CHINA Equipment Under Test (EUT) Product Name: AMPLIFIER Model No.: PWMA4004BT Trade Mark: PWMA5000BT, PWMA698BT, PWMA798BT,PWMA5000BA FCC ID: 2AIG5PWMA4004BT Applicable standards: FCC CFR Title 47 Part 15 Subpart C Section 15.249 Date of sample receipt: May 20, 2020 Date of Test: May 20- June 01, 2020 Date of report issued: June 01, 2020 Test Result : PASS * * In the configuration tested, the EUT complied with the standards specified above. Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 2 of 37 2 Version Version No. Date Description 00 June 01, 2020 Original Prepared By: Date: June 01, 2020 Project Engineer Check By: Date: June 01, 2020 Reviewer Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 3 of 37 3 Contents Page 1 COVER PAGE ............................................................................................................................................ 1 2 VERSION .................................................................................................................................................. 2 3 CONTENTS .............................................................................................................................................. 3 4 TEST SUMMARY ..................................................................................................................................... 4 4.1 MEASUREMENT UNCERTAINTY ............................................................................................................ 4 5 GENERAL INFORMATION ...................................................................................................................... 5 5.1 GENERAL DESCRIPTION OF EUT ......................................................................................................... 5 5.2 TEST MODE ........................................................................................................................................ 7 5.3 DESCRIPTION OF SUPPORT UNITS ....................................................................................................... 7 5.4 TEST FACILITY .................................................................................................................................... 7 5.5 TEST LOCATION ................................................................................................................................. 7 6 TEST INSTRUMENTS LIST ..................................................................................................................... 9 7 TEST RESULTS AND MEASUREMENT DATA .................................................................................... 11 7.1 ANTENNA REQUIREMENT ................................................................................................................... 11 7.2 CONDUCTED EMISSIONS ................................................................................................................... 12 7.3 RADIATED EMISSION METHOD ........................................................................................................... 15 7.3.1 Field Strength of The Fundamental Signal ................................................................................ 17 7.3.2 Spurious emissions .................................................................................................................... 18 7.3.3 Bandedge emissions.................................................................................................................. 23 7.4 20DB OCCUPY BANDWIDTH .............................................................................................................. 26 8 TEST SETUP PHOTO ............................................................................................................................ 29 9 EUT CONSTRUCTIONAL DETAILS ..................................................................................................... 31 Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 4 of 37 4 Test Summary Test Item Section in CFR 47 Result Antenna requirement 15.203 Pass AC Power Line Conducted Emission 15.207 Pass Field strength of the fundamental signal 15.249 (a) Pass Spurious emissions 15.249 (a) (d)/15.209 Pass Band edge 15.249 (d)/15.205 Pass 20dB Occupied Bandwidth 15.215 (c) Pass Pass: The EUT complies with the essential requirements in the standard. Remark ：Test according to ANSI C63.10:2013. 4.1 Measurement Uncertainty Test Item Frequency Range Measurement Uncertainty Notes Radiated Emission 9kHz ~ 30MHz  4.34dB (1) Radiated Emission 30MHz ~ 1000MHz  4.24dB (1) Radiated Emission 1GHz…

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Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 29 of 37 8 Test Setup Photo Report No.: GTS202005000200 Global United Technology Services Co., Ltd. No. 123-128, Tower A, Jinyuan Business Building, No.2, Laodong Industrial Zone, Xixiang Road, Baoan District, Shenzhen, Guangdong, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 30 of 37