If you use Ableton Live, you need a Launchpad. Its 8 x 8 grid has become ubiquitous with the evolution of electronic music, letting you launch clips, play drum racks and control your mixer, all while creating impressive lightshows.
Launchpad integrates immediately and seamlessly with Ableton Live, without any setup whatsoever. Just plug in and start making music.
It will ship swiftly and safely the next day!