Akai Professional LPK25 | 25-Key Ultra-Portable USB MIDI Keyboard Controller for Laptops 25-key USB MIDI keyboard controller gives you expressive performance with computer-based digital audio workstations, sequencers, and more 25 velocity-sensitive mini-keyboard keys are highly portable; writing sessions, capturing ideas and studio use with nearly all music creation software Built-in arpeggiator provides melodic inspiration and versatile patterns for modern music production Plug-and-play USB connection for Mac and PC; no driver installation required. Perfect for Pro Tools, Logic, Cubase, Studio One, Reaper, Digital Performer, Ableton, etc USB-powered; no additional power cable needed Sustain button, octave up and down, and tap tempo controls ensure your ideas translate from head to hardware Includes editing software for Mac and PC; easily customize the keyboards' MIDI commands to fit your workflow