Master Lock® Bluetooth® padlocks turn smart devices into a key, true keyless convenience provides greater control and flexibility to share access with friends, family, colleagues and employees. Enjoy peace of mind by monitoring the lock's activity and receive tamper alerts and low battery notifications. With anti-shim technology offering maximum security, these padlocks combine ergonomic features with strength, durability and reliability, making them the perfect choice for use at home, office, job site or school. Master Lock® Bluetooth Padlock, Smart, Metal Body, 11/32 in Shackle Dia, 2 in Shackle Height, 15/16 in Shackle Width, Boron Alloy Shackle, 2-7/32 in Body Width, 2-7/8 in Body Height, 1-1/4 in Body Thickness, Black