KORG nanoKEY2 Slim-Line Portable USB MIDI Keyboard Controller 25 Keys with USB Cable

Features:
Super compact size design, lightweight and convenient to carry around.
25 velocity-sensitive keys that transmit note messages.
6 control buttons for more flexible operation:
--SUSTAIN button-- transmits sustain messages. While pressing down this button, the note will sustain even after you release the key.
--MOD button-- transmits modulation messages. You can apply modulation like vibrato by pressing and holding down this button.
--OCT-/OCT+ button-- select the pitch of the keyboard in steps of an octave.
--PITCH-/PITCH+ button-- transmits pitch bend messages
Power and USB - MIDI data travels down the same USB cable for a clean, efficient workspace.