Multiple Unlocked Ways: fingerprint, password, key, tuya app/smart life app App Management: manage users, dynamic password, timed users, unlock record query Easy Installation: replace traditional ball knob lock/lever door lock directly, no need drill extra hole and no cord. Universally fits door thickness between35-50mm. Supply: used recharged (included), there is emergency charge and low power reminder. Friendly Design: Our door lock knob could be configured for left opening or right opening doors. The door lock comes with Auto-lock functions as well as always open mode. With these features, the lock is suitable for all kinds of scenar, bedroom, hotel, offices, store room, etc.