Alesis VI25 | Advanced 25-Key USB MIDI Keyboard & Drum Pad Controller (16 Pads / 8 Knobs / 24 Buttons) MIDI keyboard controller for composing digital music and playing virtual instruments 25 full-sized, square-front, semi-weighted keys and 16 multi-color RGB backlit pads that respond to velocity and pressure 8 knobs and 24 buttons assignable for hands-on control of your digital audio workstation, plug-ins, and instruments Powered by USB connection to computer with optional power adapter for more complex setups Includes AIR Xpand!2 virtual instrument and Ableton Live Lite free downloads