August | Smart Lock Pro Dark Gray August Smart Lock Pro, 3rd Generation in Dark Grey Auto-Lock and Auto-Unlock: August locks your door automatically when leave and unlocks hands-free as you approach DoorSense Technology: Integrated sensor tells if your door is open or closed Activity History: Track who is coming an going with a 24/7 activity feed Unlimited Virtual Keys: Send guests keys from anywhere instantly-all from the August app Works with August Connect Wi-Fi Bridge (sold separately): control your door from anywhere with the August Connect Wi-Fi Bridge and use Alexa, Siri or Google Home to lock your door Easy Installation: Works with your existing single-cylinder deadbolt