Master Lock® 4400D Bluetooth Padlock, Indoor, Black/Silver, 1 29/32" Width

Features a 1 29/32 in (47mm) wide metal body for durability. The 9/32 in (7mm) diameter shackle offers 7/8 in (22mm) vertical clearance and is made of boron alloy, offering maximum resistance to cutting and sawing. The smartphone/app interface offers speed, ease of use, keyless convenience and the ability to share access. The locking mechanism features anti-shim technology, offering maximum security.