The Air Gesture feature of the Samsung Galaxy S4 lets you control the S IV without touching the screen. You can skip tracks, answer calls and scroll down emails, all just by gesturing or waving over the screen.
Air Gesture is a feature that makes the Samsung Galaxy S4 faster and easier to use. Want to skip that track you've heard too many times? You don't have to worry about hitting the skip button, just wave across the screen. Someone ringing? Gesture across the face of the S4 and the call will begin. But it's also great if your hands are dirty or soaking wet, or if you're wearing very thick gloves. Just wave across and the S4 will do the rest.
Head over to the Settings menu and you can turn on the Air Gesture feature. This then lets you control certain features of the phone just by waving across the screen. It means you can control incoming calls, the music player and emails without having to touch the display.