Google Nest Doorbells: What's the difference between the Hello, Doorbell (Battery) and Doorbell (Wired)?

Google Nest first introduced a video doorbell in the form of the Nest Hello back in 2018. It was a wired doorbell, meaning installation wasn't suitable - or more difficult - for some households.

Source : https://www.pocket-lint.com/google-nest-doorbell-battery-vs-nest-hello-vs-doorbell-wired-differences-compared/