AN OMNISCIENT DOORBELL

The basics of the Nest Hello doorbell are not novel. When someone rings your bell, you get a basic smartphone notification. But if you subscribe ($50 annually), it one-ups the competition by using AI to recognize and remember faces, so pings are more specific: Nest noticed the mailman at the front door. It also works as a security camera, capturing hi-res video 24/7 for a searchable record. $229; nest.com