This is a Yamaha MU128, an XG sound module, and good condition units are becoming scarce. While there are some scratches on the top panel, the other surfaces are relatively clean, and the LCD screen still has its protective film, though it's slightly peeling. Also, unlike many units, the knobs and switches haven't yellowed, which is common in older units. This is recommended for those looking for a unit in particularly good cosmetic condition. Although it's been stored for a long time, I've confirmed its operation with multi-channel MIDI input in a current DTM environment, and checked the responsiveness of each switch, so it works almost perfectly (I haven't checked all inputs and outputs, hence this wording). The only issue is crackling when turning the volume knob, which occurs on both the headphone output and the main outputs. However, the sound is fine when the knob is set to a specific position. An AC adapter is included.