record digital whiteboard video. ????Due to the age characteristics and the actual life constraints, students have certain difficulties in understanding some mathematics concepts only by teachers' explanations and teaching aids. At this time, the use of electronic whiteboard teaching to pave the way for students to bridge, according to the content of the textbooks and teaching needs, static and dynamic, dynamic and static, through the vivid and interesting pictures, to help students fully perceive, based on the perception of the knowledge Resolution and synthesis. Practice has proved that the better the perception, the better the effect of learning and memory, the clearer the concept is formed.. 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.