The Master Lock 4401DLH Bluetooth padlock features a 2-7/32 in. (56 mm) wide metal body for durability. The 11/32 in. (9 mm) diameter shackle offers 2 in. (51 mm) vertical clearance and is made of boron alloy, offering maximum resistance to cutting and sawing. The smartphone/app interface offers speed, ease of use, and greater control with the ability to share access, with keyless convenience. The locking mechanism features anti-shim technology, offering maximum security. The 1 year limited warranty provides peace of mind from a brand you can trust. • For indoor and outdoor use; all-weather lock is best used for residential gates, sheds, garages, outdoor storage lockers and tool chests • Use your smartphone to open or enter keypad code when smartphone is not present, Internet connection not required to operate • Share access, monitor activity, and receive alerts using the free app for Android and iOS • Padlock features a 2-piece weather cover, metal body construction, boron alloy shackle, and anti-shim locking mechanism for improved strength, security, and weather resistance; military-grade Bluetooth authentication and encryption • 2-7/32 in wide lock body; 11/32 in diameter shackle with 2 in length, 15/16 in width; extended length shackle for application flexibility; for personal use, supporting up to 10 locks UPC: 071649276002 Weight: 0.57 lbs RKU: LOW804055