large dry erase board. The last century 90 late years, with the rapid development of computer technology, new multimedia teaching tools to computers, projectors, video Showcase, the central control system consisting of the growing popularity of the sound, image, text. 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.