The August Smart Lock is a door lock that you can lock and unlock using your phone. The lock uses Bluetooth through an app that you can download on a device. The lock can also be used using Amazon’s Alexa, Google home, and Siri. It is pretty easy to install the Smart Lock.  All you do is screw it in to the existing deadbolt on your door and calibrate the lock. Also it has a cool feature called DoorSense, which tells you on your device whether the door is locked or unlocked.