HTC Touch Pro2 proximity sensor demo
The HTC Touch Pro 2 is among the very few Windows Mobile device that has a proximity sensor (the other being the LG Incite). The purpose for the proximity sensor is to turn off the display when you’re on a call to conserve battery. Then, when you pull the phone away from your face, the screen goes back on so that you can view you calendar, add another caller, etc.
http://pocketnow.com/
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Proximity sensors are absolutely essential, for organisations that use large, heavy vehicles – when used for reversing. However, they are also very useful for smaller vehicles, though they can manage without them. In both cases, accidents are substantially reduced.