Description: On-board TPA3116D2 Class D dual channel audio amplifier chip 50W+50W stereo audio output with 3.5mm audio jack and 3P pin header dual audio input port Power supply ploarity reverse protection, speaker output short circuit protection, power on/off "anti-striking" protection, no "pop" sound On-board volume adjusting potentiometer knob with switching function Specification: Working Voltage: DC5V-24v Module Size: 63 X 51 X 22mm/2.5 X 2.01 X 0.87inch(L*W*H) Package Includes: 1 Piece TPA3116D2 2X50W Amplifier Board