This is the E.W.S. Tri-Logic Bass Preamp II. It has scratches and dirt, but there are no particular problems. It's an 18V specification that takes two batteries. It operates from 9-18V, so it can also be powered by a 9V AC adapter. The knobs are missing, and the three EQ knobs have been replaced with generic aluminum knobs. One screw is missing from the back cover. I'm listing it at a low price. Thank you.