digital whiteboard presentation. 6 , the difference in maintenance costs: The traditional electronic whiteboard circuit is complicated, the ground bracket or the wall surface is fixedly installed, which is easy for students to wear and accidental damage, and the maintenance cost is high; the optical induction technology electronic whiteboard has a simple circuit, is suspended and installed, is not easy to be damaged, and has low maintenance cost.. 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.