Using the AirPen
From ViewSonic Documentation
Pen Nibs
Using the Presenter Function
You can press and hold the Air Mouse button to use the AirPen (VB-PEN-007) as an onscreen cursor, use the Previous Page and Next Page buttons as a previous page and next page switch, and the side Volume Up and Down buttons to control the volume level.
Pressing the Air Mouse button and Power Button at the same time will function as a left mouse click button.