Employs the TDA2009 class AB audio power amplifier IC for quality stereo applications. May be operated on a supply voltage of 8 to 22 volts DC. This is a very straight forward stereo amplifier; complete with a PC board about (1-3/4"W x 3-1/2"L x 1-1/4"H --w/o Heatsink). Powerful enough to power your stereo for a mid-sized room and more than enough for use in a automobile.