1, Function: Under normal circumstances, the red key is a master key, which can unlock all functions of the door lock, including locking and unlocking. Main door lock control tool. The blue key is a spare key, which can only be used to open the door lock, not lock it.

2. Appearance: The red key and the blue key have different designs in appearance. Can be distinguished by different colors. The red key is red and the blue key is blue.

3. Usage: The red key is the main key for daily door lock operation. Used for locking and unlocking door locks, with complete functions. The blue key is a spare key, which is used as an unlocking tool in an emergency.