For the musician on the move, Focusrite releases the iTrack One Pre for iOS. It comes in a tiny little cube but is quite powerful with a mic preamp and guitar input designed for high-resolution audio recordings straight into your iPhone, iPad, or iPad Touch. You wouldn’t even need to pack a power supply just plug it into your device and you’ll get all the power you need. You can be ready for those impromptu moments of inspiration anytime just plug it and start recording. This cube works with most iOs devices up to and including the iPhone 6s and 7.
Read more here: http://www.musictech.net/2017/03/focusrite-itrack-one-pre-ios/