This is a Teenage Engineering rhythm machine. I bought it about three years ago and used to play with it occasionally. I haven't been using it lately, so I'm offering it for sale to anyone who needs it. I've checked the sound output and all the buttons, and they work fine. However, it's been used quite a bit, so it has a corresponding amount of wear and tear, and some dirt. The outer box, in particular, is quite beat up. If you're looking for one, please consider purchasing it.