The smart lock -- which requires an easy enough install -- is powered by back-up batteries, just in case the Wi-Fi or power goes down. (You can still carry a key for peace of mind.)
The real advantage is that you can give remote access to visitors-- say, a dog walker who's arriving at a certain time. The app also keeps a log of who's been coming and going, so you can check in to see if your kid is home from school yet.
