The blue key is a decorative key. In the use of smart locks, decorative keys are different from master keys. The decoration key can only be used for decoration, and the universal black key can open all the functions of the smart lock.

The difference between the blue key and the black key is that the blue key is a decorative key, which can open all the functions of the door lock, including locking and unlocking; The black key is for the householder. After the decoration is completed, the householder can turn in the lock core with the black key, and the blue key of the decorator will automatically become invalid.