Novation Launchkey is a MIDI controller designed for use with music production software. It is used by many professional and amateur musicians, producers, and DJs. It is a USB-powered device that connects to a computer and allows users to control their music production software with a variety of knobs, sliders, and pads. It also has a built-in arpeggiator and a range of other features. It is compatible with most major music production software, including Ableton Live, Logic Pro, and Pro Tools. It is also compatible with iOS devices, allowing users to control their music production software from their iPad or iPhone.