Adcom GFA-545 II solid state, 2-channel amplifier. 100 W continuous average power into 8 ohms and 150W into 4 ohms. Like all Adcom gear, built like a tank and made to last! Dimensions: 5"H x 17"W x 11"D. See "AK Database PDF Gallery" for online manual and full specifications. The piece is in great shape with only a few surface scratches on top. It was lightly used as part of my third stereo system, which I have decided to part with prior to retirement and moving.