Nest Hello Doorbell with Nest Hub CharcoalKnow whos knocking. Pair Google Nest Hub with Google Nest Hello video doorbell together to see and speak with visitors at your door, right from your Nest Hub. 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. The Nest Hub is a 7 in. touch screen display that lets you view today's reminders, stream videos and watch