Unikey Kevo deadbolt

You mean what if you are inside and trying to keep someone out but since you are close to the door and your phone is in your pocket they can just touch the lock to unlock it?
 
I understand your concerns and they are very valid ones; the good news is that we thought of theses as well and have elegantly solved them.  We put a tremendous effort into positioning technology with Kēvo.  We can determine if you are on the inside vs. outside of your home and even create a ~10 foot authorized access area on the outside, all to prevent against unauthorized accesses.  -Phil Dumas
Probably separate directional antennas, limited RF power, and signal strength algorithms.
 
My car has no trouble telling which side of the door I'm on, so I'm guessing this lock uses similar technology.
 
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