USB bus powered (no AC adaptor required). Ready to play with 3x included virtual instruments (software), expand playability with sustain & expression pedals (available separately), transport & more), sliders, sure-grip pitchbend/modulation stick, 8x dynamic pads for finger drumming & MIDI triggering, 45x assignable controls (knobs, buttons, works with any DAW (Mac or PC). Compatible with Windows 7 & Mac OS X Snow Leopard. dimensions: 606 x 251 x 91mm. Weight: 2.9kg