The Nest Hello video doorbell is an intelligent HD security camera designed for a front door, replacing an existing wired doorbell. Tough on intruders and easy on the homeowner, Nest Hello delivers comprehensive security while remaining delightful to live with and use every day. Hello monitors the front door 24/7 and alerts users when people are at the door, even if they don’t ring the bell. It spots unfamiliar faces, detects people talking and hears dogs barking—then sends an alert.