THE 5-SECOND TRICK FOR YEALINK MEETING BOARD 86

Front-projection interactive whiteboards Possess a video projector in front of the whiteboard. A downside of front-projection whiteboards would be that the presenter, standing before the display screen, have to extend his / her arm with or and not using a stylus to stop casting a shadow.A Wii-dependent IR technique was invented by Johnny Chung Lee,