Exterior Bluetooth Smart Padlock, 2-7/32" Wide Metal Body For Durability, 1/32" Diameter Shackle Offers 2" Vertical Clearance & Is Made Of Boron Alloy, Offering Maximum Resistance To Cutting & Sawing, Injection Molded Body Cover, Elastomer Shackle Seals & Weather Protected Internal Components, Use Your Smartphone To Open Your Lock With The Free Master Lock Vault Locks 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 & In App, Comes With Easy To Replace CR2450 Battery, Battery Jump Allows For Temporary Access If Battery Dies While Locked, Locker Mode Setting Allows For Storage Inside A Locker, Compact Footprint Fits Most Lockers.