Product name: Class AB 2.1 channel power amplifier Working voltage: DC9-18V Output power: maximum 2x80W stereo (18V/4 ohm) and 1X120W pure bass (18V/2 ohm)-can be connected to 2/4/6/8 ohm speakers Input mode: 3.5mm audio line input or 3P-2.54mm terminal input Protection function: power input reverse protection, short circuit<br><br>protection, overcurrent protection, overheat protection Overall (including heat sink): 72.36mmx96mx27mm Potentiometer handle opening: 7mm Installation hole spacing: 25.4mmx48.26m (compatible with Bluetooth module spacing) Mounting hole size: M3 size:72.36x66.65mm Material:PCB+metal colour:black<br><br>Package Contents: 1 * power amplifier board<br><br>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.