cheap whiteboard with stand. Repeat one page, add and modify, and emphasize on one page to deepen the student's impression. When the teacher fills a board and does not need to save, just tap it gently, the full board text and graphics are instantly ??erased off??, saving time and effort, without any consumption and pollution, truly belongs to the absolutely environmentally friendly teaching hardware.. 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.