This MC-303 is fully functional and in great condition.  Includes power supply.

The Roland MC-303 Groovebox is a self-contained, retro-styled sequencer and integrated sound module with some very high-tech features. Techno, jungle, hip-hop, acid and other dance styles can now be approached easily and creatively by dance music producers and other groove enthusiasts with little or no musical training.

• 448 dedicated dance sounds, 40 synth basses (TB-303, etc.), 35 synth leads, 33 synth pads
•  12 rhythm kits, including TR-808, TR-909, techno, jungle and house sets
•  Built-in vintage synth sounds and arpeggios, Preset and User dance patterns with 300 variations
•  16-part multitimbral with an 8-track sequencer containing multiple quantize functions: Grid, Shuffle and Groove
•  Resonant filter, LFO, envelope control and built-in effects: delay, reverb, flanger and chorus
•  Realtime Phrase Sequencer (RPS) for instant recall of musical phrases
•  Low Boost feature
• Note that this product is no longer in production. Similar capabilties can be found in the D2 and MC-307/505 Grooveboxes.