Nest Hello Video Doorbell (10-Pack)Nest Hello lets you know whos there, so you never miss a visitor or a package. It can tell the difference between a person and a thing, then alert you even if someone doesnt ring the bell. With a Nest Aware subscription, it can also tell you if its a person you know or a stranger. Youll also hear everything loud and clear thanks to HD Talk and Listen, which even suppresses background noise and reduces echoes. Nest Hello requires an existing wired Door