digital whiteboard+online tutoring. The maintenance of the optical electronic whiteboard is relatively simple. The optical electronic whiteboard is not afraid of scratches, impacts, riot, waterproof, dustproof, oil-proof, anti-electromagnetic interference, anti-light interference, and meet various environmental requirements. Moreover, the damage of the optical whiteboard surface does not affect the interactive use.. 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.