It is a mini power amplifier for 2.0CH speakers. Treble, bass and volume adjustment buttons for easy operation. Supports AC/DC12V power supply, suitable for home and car use. Left and right channel output, rated power 20W + 20W.Super mini size amplifier can be hold by one hand. Note: Power adapter is not included. It supports 12V 2A-5A power supply, and power interface size is 2.5x5.5mm. Specifications: Rated Power: 20W+20W Load Impedance: 4-16Ω Frequency: 20Hz-20KHz SNR: 90db Colour:Black Material:ABS+Aluminium alloy Size:13.3x11.3x5cm Package Contents: 1 * Audio Amplifier 1 * User Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.