ZOOM's RhythmTrak RT-223 rhythm machine with a variety of rhythm patterns. This item was in a live music venue. Since there is no adapter, I tried putting in batteries, but it did not power on. The battery compartment cover is missing. I do not know how to use it, so please purchase it as a junk item. - Model Name: RhythmTrak RT-223 - Brand: ZOOM - Function: Rhythm Machine - Display: LCD Display - Buttons: Multiple drum pattern buttons - Demo Function: Equipped with a demo function Thank you for viewing.