This works well. The install is easy. I have one very major complaint. The blurb on Amazon does not explain that you have to pay for a cloud subscription to store and retrieve the short videos of motion events. The promotional material and install instructions are structured such that you do not catch this ¨gotcha" until the unit is installed and you use it for a day or 2. There is no provision to store these videos locally on your own computer. I am giving this just one star because they are not up front about the need for a paid subscription and the lack of a local event video storage option.
Second, Ring sells a contact sensor. The two-piece sensor can be placed on doors or windows and will notify you of open/close movements. Third, they sell a pet-friendly motion detector. Fourth, they sell a range extender. The range extender is the only sensor that requires AC power, but it also includes 24-hour battery backup. The Range Extender is used to boost the signal emitted by your Base Station to help eliminate dead zones.
Ring’s sensors operate on battery power, the keypad and base station come with AC adapters, and the Z-Wave range extender plugs directly into an AC outlet. All three of those components have battery backup, so the system will continue to operate in the event of a power outage. The base station connects to your home network via hardwired ethernet or Wi-Fi. A Ring Protect subscription activates an LTE module in the base station that will keep the system connected to the internet if your broadband connection goes down. You can even run the keypad on battery power full time if you choose, since most homes don’t have AC outlets right next to doors. An LED will tell you when the battery needs to be charged.

3 - If you do not answer the alert fast enough, you are locked out-- even though someone is standing at your front door. You cannot "turn on" the camera from your phone or tablet. If someone is there and you do not have an "ACCEPT" button on the screen, there is just no way to see or talk to them. This is obviously a software flaw. You should always be able to "wake" a camera remotely and talk to a person at your front door. Or maybe you just want to see the view outside your front door. You should be able to access the camera / microphone and enjoy your front yard.