electronic white board. The film, the insulating mesh, the conductive film, the insulating mesh, the vertical resistive film, etc., and the combined film have the same size as the used area. The working principle is to add a fixed voltage to the resistive film. Under the action of no external force, the conductive film does not contact the resistive film, no voltage is measured, and there is no information reaction of the positioning. When a hard object is pressed at a certain point of the resistive film, the current is read by the test circuit through the conductive film, just like a point test from a potentiometer to a varying voltage, which is related to the position of the touch point, according to the level And reading in the vertical direction 18. 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.