Lock is used in recent years and the function of a strong lock, so if you want to use the lock function, the lock must have such a function. Anti-lock has two concepts, one in the outdoor lock, one indoor lock.
Outdoor lock is very simple, the general is the key to turn two laps, so that even if the person has a key to open the door, can only be used in the outdoor key to open, so to prevent the thief turned the window into the house, stole something directly from the door Leave
The other is the indoor lock, these lock the way more, and some locks only need to click on the line, and some for the handle to turn around, there are also using the key to turn two laps, in short, look at the specific situation of it This lock is mainly to the owner of a private space, after the lock, outside the people even if the key is not into the door, you must knock on the door to open the door to enter the room.
With the key in the room lock door, can not be opened from the room.