Front-projection interactive whiteboards have a video projector in front of the whiteboard. A disadvantage of front-projection whiteboards is that the presenter, standing before the monitor, have to extend her or his arm with or without a stylus in order to avoid casting a shadow. A Wii-dependent IR method was invented https://yealink-meeting-board-8635689.post-blogs.com/55052658/not-known-details-about-yealink-meeting-board