These include proximity sensors that gauge the distance ahead of and behind a vehicle with a series of beeps.

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There are also optional breakout and Bluetooth boards to connect sensors like range finders, IR proximity sensors, photo detectors and thermostats.

ENGADGET

What's more, the sensors are apparently also able to detect the proximity of the object and adjust the resistance of the door accordingly -- for instance, slowing the door down if you're about to slam it into a lamp post.

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Whereas the original prototype had a thin, flimsy shell, the Virta 2's gone downright rugged, ditching the iPhone chrome for a more durable gunmetal frame, and there's a full compliment of sensors (compass, accelerometer, ambient light and proximity) alongside quad-band radios, WiFi, Bluetooth and a pair of cameras for your video chat testing needs.

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