Entrance-projection interactive whiteboards Have got a movie projector in front of the whiteboard. A disadvantage of entrance-projection whiteboards is that the presenter, standing in front of the display, will have to lengthen her or his arm with or with out a stylus in order to avoid casting a shadow. : https://johnnyibulc.fitnell.com/74962227/the-best-side-of-interactive-whiteboard