Hololens is controlled by natural input methods such as gaze and gestures. In the above video Microsoft explains how these gestures are used to control the Hololens experience. Microsoft has also augmented these gestures with a bluetooth-enabled clicker, which makes delivering the airtap somewhat easier
The Hololens development edition is now available for pre-order for $3000 and will ship to US and Canada by the 30th March 2016.
Prospective developers can apply to purchase the kit here.