Covering the back door is a SimpliSafe Indoor Camera with motion detection alerts that also come directly to our smartphone in real time.
We have a Ring Video Doorbell (Gen 2) and that shows a live view of the front side of our home (it's also helpful for quickly checking out the on-street parking situation!), with pings going straight to our phone and the multiple Amazon Echo Dot speakers around the house when a visitor presses the button. Covering the back door is a SimpliSafe Indoor Camera with motion detection alerts that also come directly to our smartphone in real time.