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Optoma EH320UST projector is perfect for schools and colleges and uses a new generation of finger-touch inter; technology. This allows several people to work simultaneously on the screen without using a pen. The ultra-short throw ratio produces images from an extremely short distance allowing you stand closer to the screen, preventing shadows and screen glare. Its 4000 lumens brightness combined with 20,000:1 contrast along with 144Hz Blu-ray 3D system, 16W speaker, and net management functions, is bringing learning to life.