Powered by 3LCD technology, the EB-420 achieves accurate color reproduction, important in education for natural-looking flags, maps & diagrams. A light output assures a clear picture, even in daylight, while a contrast ratio of 3, 000:1 delivers sharp detail. Super-easy to set up & use, the EB-420 features 3-in-1 USB (Universal Serial Bus) display, so one cable is all thats needed for visuals, audio & mouse control. The picture can be aligned in seconds using the vertical & horizontal keystone correction, which is unique to Epson in the short-throw category. Plus, the projector can be conveniently turned on & off from a wall switch using the direct power on/off function.