digital board whiteboard. 2 , occlusion hidden, presented in batches. The cover screen function provided by the Sivo whiteboard can be used to import pictures as the theme, which is conducive to creating scenarios. According to the progress of the study, resources can be presented in batches, which not only helps students to concentrate, but also effectively guides students' thinking development. It is not only practical in the new lectures, but also very useful in the usual practice and review classes.. 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.