digital mini whiteboard. The screen-style function of the whiteboard is more able to hold students. White curtain, like a large screen screen, as both can pull horizontal, vertical and can pull, as well as concealment, which enable students to its great curiosity. Using the stretch function of the curtain, the teacher can gradually present the teaching content to meet the expectations of the students, so that the knowledge and concepts are more clear in the demonstration, and also expand the angle and way of thinking about the problem. In addition, because the screen is large enough, it is also good for students' vision. For example, the introduction of new lessons in English teaching, the use of the stretch function of the screen in the teaching of words, categorization of words, game settings, etc., is very effective.. 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.