http://www.ikmultimedia.com/products/irigkeys37pro/ for more info.
Affordable portable — Hit the Road
Ever have an idea on the road but didn't have a way to quickly turn it into something real? Or maybe you just want to practice in some downtime on the bus or jam a pick-up gig and don't have the space to bring the full rig... Now you can with iRig Keys 37 PRO, an ultra affordable and extremely portable full sized key USB MIDI keyboard controller for your Mac or PC. It features 37 full-sized velocity-sensitive keys (that's a full 3-octave range plus 1 note), takes up minimal space and can easily fit in a backpack or a carry-on bag for use on the go with your laptop.