Upgrade your deadbolt with the all-new August Wi-Fi Smart Lock, Matte Black. Remotely lock or unlock the door, check door status, grant virtual guest keys, and see who's coming and going. Or use your favorite voice assistant to control your door. This smart lock is easy to install and attaches to your existing deadbolt on the inside of your door so you can keep your original keys. And with built-in Wi-Fi, it requires no additional bridge to connect. With August door locks, you won't believe what your door can do. Experience a front door that locks after you leave and unlocks when you approach. You have the power with the August app from your phone or Apple Watch. Auto-Lock automatically secures your front door once it's closed or after a specified amount of time, for up to 30 minutes. This wireless remote door lock works only with a single-cylinder deadbolt. Requires the free August app and a Wi-Fi internet connection (802.11 b/g/n 2.4GHz)d.