AKAI LPK 25 - USB/MIDI controller keyboard with 25 velocity-sensitive mini-keys, arpeggiator, sustain button, octave up and down, tap tempo controls, plug-and-play USB connection (Mac & PC) requires no driver installation, small enough to fit in a backpack or laptop bag, 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