Description: Resistors use precision patches to ensure a good signal-to-noise ratio. Built-in Bluetooth chip and Bluetooth 4.2 input function. PCB uses 1.6mm thick double-sided sheet, 2.0 oz copper thickness, spray tin full process, to ensure good passing performance of large and small current. First-class PCB quality. Fully enclosed dustproof potentiometer, the performance is more stable, more durable than ordinary potentiometer. Use high-current inductors for red and gray ring audio to ensure the sound is crisp and powerful. This machine adopts all-aluminum chassis, the surface of the chassis is all processed by brushed oxidation coloring process, all aluminum knobs, feel very good. Specification: Size: 185x105x43mm Working method: Class D Quiescent current: 50mA Work efficiency: 90% Rated output power: 2x50W+1x100W Frequency response: 20Hz to 20KHz Working voltage: DC 18V to DC24V Maximum output current: 2A Power supply: DC 24V(Not included) The function of the knob from left to right is: left and right channel treble adjustment, left and right channel bass adjustment, subwoofer volume adjustment, subwoofer frequency adjustment, total volume adjustment Package Includes: 1 Piece Amplifier