For communication and order: ( Phone number appears when clicking the contact button ) Fingerprint Secret code (99 secret codes) Card (up to 50 cards) and the device comes with 2 cards Open with a secret number Open with a backup key Control via TTLock app For communication and order: ( Phone number appears when clicking the contact button ) #smart_lock #smart_door_lock #smart_lock #smart_lock #smart_door_handle #the_smart_lock #smart_door_lock #electronic_lock #electronic_locks #smart_lock_apartment_door #smart_lock_exterior_door #smart_lock #smart_door_lock #door_fingerprint #smart_lock_installation #door_lock