Where to buy
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Should you buy it?
The battery Nest Doorbell uses on-device processing to tell people, packages, animals and vehicles apart, and includes three hours of free event history. Its tall 3:4 video frame shows visitors head to toe, and it runs on battery or wired power. Reviewers praised the smarts; the video is lower resolution than rivals and cold weather hurts battery life.
Smart home users who want useful free alerts.
Very cold climates.

