A Simpler Home Security System
It's even better
Screenshots
Hunter's comment
the Secure hub can be disarmed by waving a key fob instead of typing a pass code, and those key fobs can be programmed to work within certain time frames—so a babysitter, for example, could access your home only while she’s working.
Link
https://nest.com/au/press/nest-expands-into-home-security/
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Hunter: 
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