Polymath provides a few PIN code mortise locks for users to choose. Smart PIN code locks have many advantages over mechanical code locks. The confidentiality is good and the amount of coding is much larger than the bullet lock. The random unlocking success rate is almost zero. The password is variable. Users can change their passwords frequently to prevent their passwords from being stolen, and they can also prevent the lock level from falling due to personnel turnover. Error input protection: When the password is entered multiple times, the alarm system starts automatically. The electronic PIN code lock operation is simple and easy, and you will learn as soon as you learn. Configure an emergency key to prevent accidents. In the state where the door is locked, when someone breaks into the lock, a strong alarm sound is emitted. Fire alarm function: If the temperature reaches 75° indoors, a strong alarm sound will be emitted and the lock will automatically open. When the power is exhausted, the lock will give a weak current reminder. There is also an automatic locking function etc.