The 2nd-gen wired Nest Doorbell is always on, so your customers can know what’s happening at their front door around the clock. 1 They’ll get built-in intelligent alerts about people, packages, and animals, plus 3 hours of event video history – no subscription required. With a Nest Aware Plus subscription, they can get up to 10 days of continuous video history. 2 And it comes with an exclusive 3-year warranty with professional installation.