Working voltage: Dual AC12-15V Power amplifier chip: TDA2030 Channel type: 2.1 channel Output power: 15W+15W Subwoofer output: 30W Low frequency response: 20Hz-200Hz Colour:Photo Color Material:ABS Size:10.8 x 8.3 x 5.7cm Package Contents: 1 x Amplifier Audio Board Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.