Korg microKEY 25 USB MIDI Keyboard USB MIDI keyboard thin, lightweight, and USB-powered Velocity-sensitive natural-touch mini-keyboard with excellent playing feel Octave Shift and Key Transpose features access the full MIDI note range Versatile controls include arpeggiator buttons, sustain/tap button, and joystick No need to install a driver; just connect it to your computer, and it's ready for use