The projector comes equipped with a pen-shaped device you use to click on the image. The WT615 interprets where you're pressing and passes this information on to the computer via USB. The projector itself is also pretty nifty -- it can be placed right in front of the screen or wall because it boasts the world's shortest throw ratio. It can produce a 2m image less than 45cm from the display.
Via Crave
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