Features: brand new and high quality A mini compact but powerful amplifier board. Easily fit for audio system. Match speakers:2/4/6/8 ohm speakers. for Protection function: power input reverse for protection, short circuit for protection, overcurrent for protection, overheat for protection. Max 2x80W Stereo (18V/4 ohm) and 1x120W pure (18V/2 ohm)-can be connected to 2/4/6/8 ohm speakers. Specifications: Material:Metal Color:Black Size:Approx.72.36x66.65mm/2.85x2.62in Working Voltage: DC9-18V Mounting Hole Size: M3 Output Power: Max 2x80W Stereo (18V/4 ohm) and 1x120W pure (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 for Protection Function: Power Input Reverse for Protection, Short Circuit for Protection, Overcurrent for Protection, Overheat for Protection Note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1x TDA7850 Power Amplifier Board