Double side locking feature in order to prevent unauthorized inside unlocking. Fingerprint, Password, IC Card, Key Unlock, Dynamic Password, Remote App Unlock. Works on any type of metal, steel, wooden, aluminum, etc doors. Best for indoor and outdoor. WiFi, Dual Verification, Airbnb Friendly, Open Mode, Anti-Tamper Mode, Mobile App, & Unlocking Logs, etc. Swappable 4 pcs AA Alkaline battery.
