The BOSS DR-670 rhythm machine, capable of creating a variety of patterns. This one was at a live house. Since there is no adapter, I tried putting in batteries, but it doesn't seem to power on, and I don't know how to use it, so please purchase it as a junk item. - Model: DR-670 - Brand: BOSS - Type: Rhythm Machine - Display: LCD Display - Controls: Dial Control - Functions: Pattern Creation, Drum Kit Selection - Connectors: MIDI In/Out - Power: AC Adapter or Batteries Thank you for looking.