THE 5-SECOND TRICK FOR YEALINK MEETING BOARD 86

Entrance-projection interactive whiteboards Have a very video clip 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 prolong his / her arm with or with no stylus to stop casting a shadow.A Wii-dependent IR technique was invented by Johnny Chu