Nektar Impact GXP49, 49-key USB keyboard, 49 velocity-sensitive semi-weighted ""full size"" keys with aftertouch, 14 RGB LED buttons for MIDI, Key repeat and Nektarine features, Pitch bend and modulation wheel, Endless push encoder for key repeat tempo control and Nektarine control, Backlit octave and transpose buttons, Note repeat button with LED tempo indicator, 7 transport buttons, Transport functions: Loop on/off, Click on/ off, Go To Locator and Undo, Class Compliant for true Plug and Play, Power supply: USB or external 9V power supply (not included), 2 connectors for sustain pedals, 1 connector for expression pedal, MIDI Out, USB, Dimensions: 805 x 230 x 72 mm, Weight: 4 kg, includes Bitwig 8-Track software (download), compatible with : Windows Vista, 7, 8, 10, MAC OSX 10.7 or higher, Linux Ubuntu 14.04 (iOS compatible in combination with otional Apple Camera Connection Kit)