Roland MIDI keyboard, USB connection, 8 control knobs, with the main unit and instruction manual. Purchased on Mercari, it has been unused since the initial operation check. I couldn't become Tetsuya Komuro. There are small scratches, and one knob is missing. - Brand: Roland - Model Name: A-500PRO - Type: MIDI Keyboard - Number of Keys: 61 keys - Function: MIDI Controller - Connection Type: USB connection - Display: LCD display - Control Knobs: 8 knobs Returns are not accepted except for operational defects. Music creation, production, composition, sound play, 369hz, 432hz, 528hz, 963hz, Solfeggio, Tachyon, Just intonation, Cosmic music, Galactic music, Frequency, Schumann resonance, 7.83hz