TouchLock Bluetooth Smart Padlock XL, Silver Shackle Size: Shackle Thickness - 5.5mm, Shackle Width Clearance - 20.5mm, Shackle Height Clearance - 18.8mm Bluetooth enabled, with mobile app to control access right from your phone This versatile lock was built with our users in mind who want to keep pace with the advances in technology of other everyday products in our increasingly connected world. From lockers to lock boxes, the BT XL provides the maximum amount of security protect your most valuable possessions With its ability to store an unlimited number of users, TouchLocks Administrator Control Dashboard makes it easy to share access with friends, family, or members of your businesss staff instantly (or revoke it if necessary) TouchLocks sleek, yet durable, design is completely weatherproofed. With protection from both unauthorized persons and the elements, this versatile smart lock is ideal for outdoor as well as indoors