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This's product board with two parts: emitter and sensor. Emitter can be attached on flat surface. It emits infrared laser curtain on the surface which is about 1mm thick invisible light and parallel with the projection screen surface, 1-2mm above the screen surface.
Portable Interactive Whiteboard is a totally featured interactive whiteboard system that transforms any common whiteboard, flat surface (including a wall) or projection screen into an interactive whiteboard.