B-Stock, Alesis VI49, USB-MIDI Controller Keyboard, 49 full-sized, square-front, semi-weighted keys with aftertouch, 16 velocity-sensitive trigger pads with illuminated RGB feedback for beat production and clip launching, 36 assignable buttons and 12 assignable knobs interface with your music software, Pitch and modulation wheels deliver expressive, creative control, Seamless visual feedback via LED screen and illuminated buttons and knobs, USB MIDI and 5-pin MIDI Out offer flexible MIDI connectivity, USB-powered and plug-and-play support for Mac and PC, includes: usb cable, ableton live lite software (download), xpand!2 by air music tech software (download), B-Stock with full warranty, may have slight traces of use