3D Face recognition feature, if you are carrying a lot of things and can’t unlock a door it’s the best feature to unlock just by standing in front of the lock, it will detect the face automatically. It has high-security facial recognition that can’t be unlocked using a photo or video. 3. Remote unlocking Mobile app WiFi enabled. See the photo of the visitor in the notification when the doorbell is pressed to unlock the Mobile app. Anti tamper alarm. Download Okos Smart app. 4. LCD to see visitors with SD card option. 4200 mah long lasting battery with an emergency charging hidden port option. Hidden manual key option to unlock. 5. Fingerprint unlocking.