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As part of a security system, the unit can help protect your home by detecting motion outside. The Nest Hello has plenty of fun and functional features, like “Quiet Time” that disables the doorbell function and only send a message through the app that someone is at your door. Another cool feature is pre programmed responses you can use called “Quick Response. ” Quick Response allows you to choose from built in responses to address people you know, or people you don’t know if you aren’t home or don’t want to be disturbed. Another reason Nest is the best doorbell camera is because of “Familiar Faces,” which recognized people who the camera has seen before. Once you mark them as known, the Nest Hello will let you know via text the name of the person when they arrive.