Masterlock 4400D Smartphone Padlock

The Master Lock No. 4400D Bluetooth Padlock features a 1-29/32in (47mm) wide metal body for durability. The 9/32in (7mm) diameter shackle offers 7/8in (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, & greater control with the ability to share access; with keyless convenience. The locking mechanism features anti-shim technology, offering maximum security. - Use your smartphone to open your lock with the free Master Lock Vault eLocks app - Never worry about a forgotten combination! - Share access with others - temporary or permanent - Share 24/7 access or limit to days or nights - Monitor access history & receive tamper alerts - Backup access using directional code on lock keypad - Low battery notification & reminder on padlock and in app - Comes with easy to replace CR2450 battery