This board contains three IC. This board is used for 120-watt audio amplification. The board contains a bridge rectifier on board. It means you just need to attach a 12 volts transformer to it and the board is ready to go. The board has been tested several times in our lab, and the result is not less than excellent. The best part about the board is that it is built of individual components. It means if anything goes wrong it can be easily serviced and components can be replaced.