Amp and pre amp in excellent working condition. The amp is rated at 150 watts into 2 channels and has a wide dynamic range from 5 hertz to 20kh. Pre amp is also wide band equalizer, has phono and tuner inputs. Simple set up that can push two sets of speakers. Sold as complimentary unit and will not separate. Specs https://www.hifiengine.com/manual_library/kenwood/km-991.shtml