This is the Roland TR-8 Rhythm Machine. Discontinued product. Includes the main unit, AC adapter, and instruction manual. Operation has been confirmed. USB Audio and USB MIDI worked normally on my macOS Tahoe environment. There is some dust on the sliders, but it has only been used at home, so it's generally in good condition. The sound sources are only 808 and 909; no expansion sound sources are included. Thank you for looking.