A smart doorbell is an excellent addition to any smart home setup. It's both a chime and, in many cases, a camera that can send feedback directly to your phone, even if you're not in your home.

Launching as exclusives at The Home Depot in April, the Kidde Smart Smoke Alarm ($54.97) and Kidde Smart Smoke + Carbon Monoxide Alarm ($74.97) are the first from the 100-plus-year-old fire detection ...