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Look for a driveway motion detector.
If you do, make sure it is not the magnetic detector type. My
preference for a driveway detector needs the metal mass of a vehicle
in order to eliminate false positives from heat (e.g. small animals)
or motion (e.g. landscape blowing in the wind). My point is simply
there are a variety of driveway sensors and not all of them require
movement. But some of them which can be a pain for false positives on
a driveway sensor might work very well as an indoor sensor for folks
entering an open doorway.
If you are looking for cheap, Amazon lists these at $7.60:
http://www.amazon.com/Motion-Sensor-Wireless-Entry-Alarm/dp/B002HIZYEK
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