Akai LPK 25

arpeggiator, tap tempo controls, octave up and down, sustain button, small enough to fit in a backpack or laptop bag, plug-and-play USB connection (Mac & PC) requires no driver installation, 4x programmable memory banks, send note information or program changes from keys, USB bus powered - no additional power cable needed. Includes USB cable and editor software (Mac & PC). dimensions: 9.7 x 34 x 2.8cm. Weight: 0.635kg