The Akai LPK25 25 note USB MIDI Keyboard is the must have piece of equipment for music creators/producers and DJs. It is a chromatic keyboard designed for PC or Mac software. It is lightweight and portable and its 25 keys produce genuine synth action. There is a built in arpeggiateor/4 memory banks which can be mapped and a sequencer for beats. The LPK25 connects via USB port and requires no external power.