... doesnot need out meet power.Product List1 receiver, 1 control box, 2 signal pens, 1 data line, 1 button ... product unfurl meeting, train, hotel, cabaret and so on.Performance1.the largest write range: 1.5m×2.0m2 ... the projection, you can record the write content on the common whiteboard in the computer leave out, ... function of the mouse, and can write on the screen on mark, to realize write no dust and ...