The August Smart Lock comes with DoorSense technology as well as Auto-Lock technology, both of which ensure that you will always know your door is both closed and locked. If you are ever uncertain about the state of one of your doors, you can check it out using the application. The smart lock also will keep track of who is coming and going from your home using the app. It can show you who entered and through what door, and if you miss any visitors to your door, you can see images depicting who that missed visitor was. All this and it takes only minutes to install.