The Master Lock No. 4400D Bluetooth padlock features a 1-29/32 in (47 mm) wide metal body for durability. The 9/32 in (7 mm) diameter shackle offers 7/8 in (22 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, & 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.
