Assure lock with Bluetooth is operated with a free app for iOS or Android phones and Samsung’s newest smartwatch. Conventional keys are replaced with digital keys. Users can set colors and upload photos to match keys and locks with people and locations, share or revoke keys, manage when each user can access the lock, and receive notifications when a key is accepted or used. The same digital key can be used to access multiple locks on one or more properties. There is no limit on the number of digital key users.