Xkey USB Mobile MIDI Keyboard with Polyphonic Aftertouch from ThinkGeek

-Super slim, super classy, lightweight MIDI keyboard for all your recording and performing needs. -25 standard sized keys. They are button keys, not standard action piano keys. They are incredibly responsive from any part of the key your fingers hit. -Professional velocity sensitivity (128 levels) and polyphonic aftertouch. -USB powered - plug and play. -Works with almost any music program and computer/tablet (when connecting to your iPad, you will have to use the Light