Features: Adopting high-power digital power amplifier specific inductance, high current, low magnetic loss, low heat generation, using oxygen free copper wire to improve sound quality, and magnetic shielding mechanism to resist electromagnetic interference. Equipped with two TPA3221 chips, it supports 2.1 channel wireless digital amplifier 100W+100W+200W high-power. Subwoofer expansion port, supporting the installation of 1602 and 3002. Multiple expansion ports, capable of connecting to microphone front stage board reverbs input or output, convenient to use. Equipped with protection mechanism, input undervoltage, input anti reverse connection, overheating, overcurrent, and short circuit protection. Specifications: Material:ABS,PCB Power Supply:DC12V-30V,above 5A Input method: Wireless+AUX+USB drive+sound card Number of channels: 2.1, left channel+right channel+subwoofer Power amplifier chip: TPA3221 Type:Amplifier Board Only.Amplifier Board with Case,Amplifier Board with Potentiometer Package Includes: 1Set Power Amplifier Board note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.