There are so many handy use cases for a doorbell camera! - How urgently you need to get to the front door? - Has that package been delivered yet? - Who left this at my door?
All that in addition to the main security feature of deterring theft, and investigating porch mysteries. There are a few doorbell cameras on the market, but this one is very nicely integrated with your Google account. That means when someone rings the doorbell, all of my Google smart speakers announce it, and the speakers with screens immediately switch to a live stream of the front door so you can see who it is and even talk to them.