NEC Technologies’ RT50X compact rear projection system is pricier than the other systems we’ve spotlighted, but it combines a projection unit and a large-screen display into a single, self-contained, fully portable system that can be transported anywhere in the school with the proper computer hookups already intact and ready to run.

The first compact rear projection unit to offer applications for video and data at just 18 inches deep—and the only self-contained unit for these applications with a 50-inch display—the RT50X gives teachers the ability to project images and data where space is limited and lighting conditions are less than...

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