Master Lock Bluetooth Padlock ProSeries ExtendedExtended 60mm shackle length for greater clearance and more flexibility Engravable front plate for quick and easy identification Built for industrial environments and outdoor conditions No ongoing costs, licence fees or supscriptions for use the app or web interface Use your smartphone to open and manage your lock with the Master Lock Vault Enterprise app no keys to lose, no combinations to forget no unauthorized key duplication Backup access using