82 inch digital touch board. The working principle of the electronic whiteboard is divided into two principles: the pressure sensing principle and the laser tracking principle. A touch-sensitive whiteboard using the principle of pressure sensing is equivalent to a touch screen of a computer , and is a human-machine interactive input device that performs a designated job by using a finger or a pen to touch an option displayed on the screen. The electronic whiteboard has two layers of pressure sensitive film inside . When a certain point on the surface of the whiteboard is under pressure , the two layers of film cause a short circuit at this point, and the controller of the electronic whiteboard detects the coordinate value of the pressed point and the position touched by the finger or the pen. , sent to the computer via a certain interface. A laser transmitter is equipped on one or both sides of the upper side of the whiteboard using the laser tracking principle. After the whiteboard is started , the laser emitter emits a laser to scan the surface of the whiteboard , and the special pen has an inductive laser function , thereby counter. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.