Features:49 assignable velocity-sensitive keys with excellent performance.1 master volume slider; 4 control buttons: Edit, Octave/ Trans + -, M.P.V-Mode.With 6.35mm sustain pedal jack; and supports MIDI out.USB 2.0 Plug and Play, no need of driver installation; USB bus powered and no additional power cable needed.Compatible with Win 8 / Win 7 / Win XP / Win Vista / Mac OSX.