Master Lock Exterior Bluetooth Padlock Silver & Black

The Master Lock No. 4401DLH Bluetooth Padlock features a 2-7/32 In. (56Mm.) wide metal body for durability. The 11/32 In. (9Mm.) diameter shackle offers 2 In. (51Mm.) 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. Comes with easy to replace CR2 battery. Battery jump allows for temporary access if battery dies while locked.