Live Photos can only be created on an iPhone 6s or later, but they can be viewed on iOS devices that run iOS 9 or later, Apple Watches that run watchOS 2 or later, and Macs that run OS X El Capitan or later. On non-supported devices, Live Photos appear as standard JPGs.
As of iOS 11, Live Photos now support effects to turn them into video loops, bounce back and forth to instantly play in reverse, and long exposure to capture time and movement in a still photo.