viewsonic digital whiteboard. This is very difficult for the average user to master. Before selecting the whiteboard, the user should compare several products to be selected, including the effective sensing area of ??the product, the type of screen (LED, LCD), image resolution, product specifications and other parameters. These parameters are clearly marked by the manufacturer, so When you purchase, you can choose a cost-effective product by carefully comparing them.. 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.