Doorbells provide you information: someone is at your door, wanting to come in or talk or drop something off.
Would you pay $200 for a doorbell? I might.
“Doorbells Become the Eyes, Ears of Smart Homes,” Wall Street Journal, February 18, 2015 D1. For sale: doorbells that include video and can connect to to your smartphone to alert you that someone is at the door. And can spot someone skulking outside your door.
Exterior cameras have been around awhile. But is this use of a common device to combine functions and, through a wireless network, let you answer with your phone, a useful improvement on the information provided? Just another in the parade of the Internet of Things?