Digicam Pen and Dot Sample – These interactive whiteboards have a microscopic dot pattern embedded inside the producing area. A wi-fi electronic pen includes an infrared digital camera that reads the dot pattern to determine the precise site around the board. : Just one individual can attract at a time. https://spencerdwmet.ttblogs.com/13819654/5-tips-about-interactive-whiteboard-you-can-use-today