Akai LPK25

The super-portable Akai Professional LPK25 Laptop Performance Keyboard is more than a 25-key velocity-sensitive mini-keyboard MIDI keyboard. In addition to its small size itt's loaded with useful features including Arpeggiator, Sustain, Tap Tempo, 4 Programmable Memory Banks. It has a killer arpeggiator, plus sustain, octave up, octave down, and tap tempo controls. And all you need to do in order to use this little controller keyboard is to plug it in, and the LPK25 will work instantly with your Mac or PC. Plug-and-play compatibility means no extra drivers to install. No need to carry an AC adapter because the LPK25 runs off of USB buss power.