1.Principle: It uses advanced computer vision technology to convert touching signal of the finger into direct mouse control and make interaction between human and the computer. 2.Feature: You can access all the information you need by just clicking on the screen, a novel and attractive way and the screen size can be enlarged or reduced within 120 inch. 3.Application Widely used in advertising, business presentation, exhibition, temporary show, education, and some guiding system 4.components core control system, special screen,projector,computer,infrared light, and some auxiliary lines 5.Tenure life No limit