Bluetooth Smart Keyed-Padlock 2-inch Wide-Body 7/8-inch Shackle Height 9/32-inch Diameter Shackle

Use your smartphone to open your lock with the free Master Lock Vault eLocks app,Your smartphone is the key, no keys to lose, nor combinations to forget,Share access with others, temporary or permanent,Monitor access history, and receive tamper alerts and low battery notifications,Backup access using directional code on lock keypad, when Bluetooth is unavailable,Battery cell type Lithium manganese dioxide