Simply swap out your existing Euro-profile cylinder with this smart cylinder — no cutting, no wiring, and no door modifications required. Retrofit completed in minutes. Works with both the Tuya Smart / Smart Life​ and TTlock​ Apps via Bluetooth, giving you flexible user management, temporary e-keys, and unlock history tracking. <0.5s one-touch unlock, plus customizable digital passcodes with anti-peep function for enhanced security. Designed to fit common European mortise cutouts (60mm or 70mm backset), making it ideal for apartment entrances, office doors, and residential front doors. Powered by long-life batteries with Micro-USB emergency charging and retains the original mechanical key function for worry-free access during power loss.