Product name: Class 2.1 channel amplifierWorking voltage: DC9-18VOutput : maximum 2x80W stereo (18V/4 ohm) and 1X120W pure (18V/2 ohm)-can be connected to 2/4/6/8 ohm speakersInput mode: 3.5mm audio line input or 3P-2.54mm terminal inputProtection function: input reverse protection, short circuitprotection, overcurrent protection, overheat protectionOverall (including heat sink): 72.36mmx96mx27mmPotentiometer handle opening: 7mmInstallation hole spacing: 25.4mmx48.26m (compatible with Bluetooth module spacing)Mounting hole size: M3size:72.36x66.65mmMaterial:PCB+metalcolour:blackPackage Contents:1 * amplifier boardOnly 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.