digital whiteboard recorder. The interactive whiteboard teaching platform (mainly including computers, projectors, interactive whiteboards), contrasting the teaching methods of the blackboard and the audio-visual platform, taking the essence (the interactive nature of the blackboard and the richness of the audio-visual education), to the dross ( The monotony of the blackboard and the one-way nature of the audio-visual education have fundamentally solved the problems and deficiencies in the previous teaching mode, and truly realized the "interaction between teaching and learning" and realized a high-quality and high-efficiency teaching mode.. 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.