M-Audio Oxygen 88 Controller Keyboard - 88-note graded hammer-action keybed with 4 selectable velocity curves, 8x MIDI-assignable knobs, 9x MIDI-assignable 60mm faders, 9x MIDI-assignable buttons, 6x dedicated transport controls, 4x zones and dedicated zone buttons for layering and splitting sounds on the keyboard, dedicated track up/down buttons, dedicated octave up/down buttons, assignable pitch bend and modulation wheels, 2x dedicated snapshot  buttons (advance and mute), 3x unique select buttons for on-the-fly step-through of presets, program changes, and MIDI channels, 3-digit LED, DirectLink mode automatically maps controls to common DAW parameters, factory presets map controllers to popular music software (Xpand!2, Hybrid, Velvet, Strike, Oddity, impOSCar, Minimonsta), compatible with Pro Tools and other digital audio workstation software, 4x velocity curves, 3x pedal inputs (2 sustain pedal inputs, expression pedal input), MIDI out port, USB port for computer connection and bus-powered operation, optional: 9V DC power in, class-compliant with Windows XP, Windows Vista, and Mac OSX. Dimensions: 1353 x 355 x 139mm. Weight: 21kg