It uses Gestures detected via built-in camera in your computer to play, pause and skip songs & videos in YouTube, Pandora, Spotify, Grooveshark, iTunes, Netflix, and more. It also allows you to control slide shows in Apple's Keynote using hand gestures.
  1. Hold your hand to the webcam
  2. Webcam detects it
  3. Flutter controls your computer

It works even when YouTube tab is not in focus or Spotify, iTunes, and other apps are playing music/video in the background. Learn more.