Video doorbells also use motion detection to track events, which means they don’t record continuously like a security camera, with the notable exception of the Nest Hello. Most doorbell cameras record subjects in both daytime and nighttime conditions, usually at an HD video resolution of 720p or greater. Smart Lock PairingOne of the most exciting features of video doorbells is that you can pair most of them with a smart lock such as the Kwikset Kevo and August Smart Lock to let guests in when you're unable to come to the door. However, the level of integration between a doorbell and lock really depends on the company. This is something we discovered when we linked the doorbells to smart locks we were also testing. The biggest difference comes from doorbells and locks designed to work together.

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