Ring Video Doorbell Wired, Home or business security, Two-Way Talk, advanced motion detection, HD camera and real-time alerts to monitor your front door (wiring required)

I was running 4 a while back because they are cheaper than any other ring device. The original wired doorbell camera is currently $40. You can get wall power adapters for them and cords are about 15ft, plenty long enough to install them where ever you want within wifi distance. If you want the backdoor to use the physical house chime and you've already installed one on the front door and have the upgraded transformer, and your backdoor shares the same wiring then it's already wired to accept the ring doorbell on the backdoor wiring too. Then you can use your phone and/or echo show for notifications too. One thing I've learned about my backdoor from installing a ring doorbell; there really isn't any reason to have a physical doorbell back there when it will automatically notify you of someone there anyway.