digital whiteboard for classroom. 2 , the difference between writing media: The traditional electronic whiteboard medium is a touch panel or a liquid crystal touch screen, and the optical electronic whiteboard medium can be any surface such as a curtain, an ordinary whiteboard, a white wall, a glass, a cardboard, or the like.. 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.