WONDOM 1 X 40Watt Class D Audio Amplifier Board -TPA3110 Mono Channel Amp For Robot Auido Screwing to chasis conveniently Shut down easily by external pulled down to GND,Startup and power down pop elimination Thermal and short circuit protection,Overvoltage and undervolatge protection Analog single ended signal input(RCA) Output 60W@4ohm 21V DC THD+N 10%, 45W@4ohm 21V DC THD+N 1%