RioRand TDA7850 MOSFET Car Audio Amplifier Board 4-channel 450W Treble Bass Adjustable DC/AC 12V Chip:TDA7850 Power supply: DC12V--16V / AC9V--12V Max.Output Power:4 x 50W Power current: 3A Min. 10000uf big electrolytic capacitors; Dimension: 120 x 65 x 38.2mm