Product category: Class AB 2.1 channel digital power amplifier Working voltage: DC 9V-18V Output power: maximum 80W x 2 stereo (18V/4 ohm) and 120W x 1 pure bass (18V/4 ohm); Impedance: support 2 ohm, 4 ohm, 6 ohm, 8 ohm speakers Audio input mode: 3.5mm audio line input, or 3P-2.54mm terminal input Protection function: power input reverse connection protection, short circuit protection, overheating protection, overcurrent protection. colour: black Material: plastic Package Contents: 1 x Amplifier Audio Board Only the above package content, other products are not included. Note: Light shooting 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.