This is a very cool RACK-MOUNT Samson 120W bridgeable stereo amplifier. It is built like a tank. Single rack 1U space, LED level meters, speaker on/off, headphone jack, more. I hate to get rid of it, but I don't need it anymore. Will trade for a quality guitar or playable violin (I play), case and bow not needed. Please see https://phoenix.craigslist.org/cph/msg/d/phoenix-rack-mount-stereo-bridge-120w/7905611646.html for pictures. Jorge