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Master Lock Resettable Combination Padlock, 1-15/16-in Wide x 3/4-in Shackle Smart

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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 access via Bluetooth or keypad code with invited guests, monitor activity, and receive tamper and low-battery alerts all from your free Master Lock Vault™ eLocks App for Android and iOS, for use with up to 10 locks

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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, and 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.

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 access via Bluetooth or keypad code with invited guests, monitor activity, and receive tamper and low-battery alerts all from your free Master Lock Vault™ eLocks App for Android and iOS, for use with up to 10 locks
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