This 4-in-1 biometric door knob offers keyless entry via fingerprint (0.2s recognition, 99.9% accuracy), customizable passcodes, remote app control within Bluetooth range, and emergency mechanical keys, with 100% local fingerprint data storage for enhanced privacy. It features a removable 500mAh rechargeable battery with Type-C fast charging, providing up to 180 days of use and low-battery alerts via the app. The smart lock includes three operating modes (privacy, silent, pass), auto-lock within 5 seconds, and allows you to manage up to 100 fingerprints and codes, share temporary access, and view entry logs. Easy to install on most US doors with just a screwdriver in 10-30 minutes, it is backed by a 1-year warranty and 24/7 customer support for reliable smart home security.