Adcom GFA-5400 Mosfet 125 WPC 2 Channel Stereo Amplifier. Tested, working and sounding good (my opinion), I have tested with the Adcom GFP-555, (another listed item). There are no known issues, some blems, scratches or imperfections present due to normal use and age. There are two pieces of black tape to protect output terminal wires from shorting to chassis (I believe). No warranty implied with sale, sold AS Described, guaranteed not to arrive DOA.