The August Smart Keypad allows you to lock your door with just one touch, and to unlock it with a unique code. Also, you can create several codes for different people, so you always know who open your door. This product is very easy to install, and it works with two AAA batteries.
The August app available for iOS and Android will allow you to know every time someone open or lock your door. Also, with the app you can easily create a temporary code for guests, so you don't have to share your own code.