SmartLife X1 Pro Smart Door Lock with Camera facilitates Dual Verification method. When you enable this dual verification option, you have to verify at least 2 unlocking methods to unlock the smart door lock. For example, you have to verify your Fingerprint and IC Key Card to unlock the door. As an alternative, you can also verify with your Fingerprint and Password, or Password and IC Key Card. This adds an additional security layer for your home/office.