With smart door locks from Bold, you'll never be in front of a closed door. You can connect the door locks via a Bridge to WiFi, or directly to your phone via Bluetooth. So you can open a lock with your phone. A smart door lock also recognizes that you're in front of the door via geofencing, so that your lock automatically opens. A Bold smart door lock replaces your current cylinder. Make sure you check the dimensions, so that you choose a lock that easily fits your door.