Head Tracking is a feature that keeps content audio tied to the screen you are watching. When turning away from a screen with head tracking enabled, dialogue and other audio will remain where the video is playing, akin to what is expected with a TV and built-in speakers.  While very effective for static screens such as a television or a stationary laptop, head tracking can be used with any device.  Head Tracking is disabled by default and can be enabled through the Dolby Dimension Mobile application when Virtualization is enabled.