Vuzix Wrap 920 VR Bundle - Manual (Page 23)

The Set Zero button establishes the Tracker’s home or centered position. As you
move your head you will see the indicators and values in the Yaw, Pitch and Roll
indicators reflect movement relative to that centered position.
Your Wrap video eyewear is now setup and ready for use.
Some types of video and certain operating situations may require audio or video
adjustment to achieve optimum performance.