M-Audio Keystation Mini 32, USB Controller Keyboard, 32 velocity sensitive mini keys, selectable volicity curves, 1 knob, 4 backlit assignable buttons (Octave, Sustain, Edit), 2 Octave-buttons (Octave range -4 bis +4), selected octave indicated by different colors of the buttons, 1 Sustain button, USB bus-powered (cable included), Plug&Play, PC/MAC, compatible with Apple iPad OS 4.3 and higher (Optional Apple Camera Connection Kit and Core MIDI App required - not included), incl. software, dimensions: 420 x 110 x 20 mm, weight: 454 gr.