As long as you're in the Apple ecosystem, these have an impressive level of features and excellent coordination between devices. Like most AirPods, simply hold them near your iPhone or iPad and they'll connect right away, no extensive pairing or app installations. Because they're always running in a low-power state, you can remove them from their little case or put them on your head, and they'll connect to the closest iOS device and start playing. It's a neat trick, but one that's always draining the battery slowly, so you may find them dead if you don't use them for too long.