The MasterLock 4401EURLHEC Bluetooth padlock allows for keyless and code-free unlocking via Bluetooth connection with your smartphone. This successor model to the popular 4401EURDLH features a robust construction with a boron shackle for high cut resistance and a hardened steel casing for durability. With dimensions of 5.6 cm in width, 2.8 cm in depth, and a total height of 13.4 cm including the shackle, it offers 5.1 cm of vertical clearance and 2.4 cm of horizontal distance between the shackle points with a shackle diameter of 9 mm. The IP56 weather resistance rating makes it suitable for outdoor use under various conditions. Security is enhanced by military-grade authentication and encryption of the Bluetooth Smart connection, which prevents hacking attempts, while the absence of a traditional lock cylinder eliminates vulnerabilities to lock-picking techniques. Operation is simplified with one-button unlocking within Bluetooth range without needing to remove your phone from your pocket or backpack, plus additional control through the MasterLock Vault app for iOS 8 and Android 4.3 or higher. The app allows for scheduling access times and dates, managing up to 15 authorized users per lock, with each phone able to control up to 40 locks simultaneously. Power is supplied by CR2450 and CR2 batteries with approximately 5 years of battery life in normal mode with slot-based unlocking or 2 years in phone mode with a constant connection, featuring easy battery replacement. This black padlock combines advanced digital security with physical robustness for reliable protection of bicycles, rental equipment, gates, storage units, and other valuables that require secure access management.