For indoor use only. Compact design is best used for indoor storage lockers Use your smartphone to unlock Bluetooth padlock. Share temporary or permanent access via Bluetooth or keypad code with invited guests. Monitor activity, and receive tamper and low-battery alerts. Padlock includes metal body construction, boron carbide shackle, and anti-shim locking mechanism and authentication and encryption 1-29/32 in. wide lock body; 9/32 in. diameter shackle with 7/8 in. length, 13/16 in. width