1. Controlled by electricity, the door can be opened very quickly.
2. The inside-set controlled-circuit can efficiently avoid the man-made damage and being unlocked by the outside power-supply.
3. To unlock with the mechanical structure driven by the micro electronics machine, instead of being driven by electrical magnetic, overcomes the shortcomings and makes the lock have a longer service-life.
4. The lock can be locked up automatically or manually.
