The Master Lock No. 4400D Bluetooth Padlock 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, & 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.

About this item PADLOCK APPLICATION: For indoor use; Compact design is best used for school, employee, athletic, and indoor storage lockers EASE OF USE: Use your smartphone to unlock Bluetooth padlock, or enter directional code on lock keypad for easy backup entry when your smartphone isn't present; Locker Mode setting allows for smartphone storage inside a locker SHARED ACCESS: Share temporary or permanent access via Bluetooth or keypad code with invited guests or coworkers, monitor activity, and receive tamper and low-battery alerts all from your free Master Lock Vault eLocks app for Android and iOS DURABLE DESIGN: Padlock includes metal body construction, boron carbide shackle, and anti-shim locking mechanism for improved strength and security; plus military-grade Bluetooth authentication and encryption DIMENSIONS: 1-29/32 in. wide lock body; 9/32 in. diameter shackle with 7/8 in. length, 13/16 in. width; Includes two locks