How do you lock this type of door from the outside?

Can be locked, the method is as follows:

Sphere door locks in the lock, the first door will be the top of the spherical pimple buttons pressed the following chart red mark; and then the door on the closed tightly, so that it can be locked from the outside, but to open the lock must be opened through the lock if you want to open the lock, and in addition to the sphere of locks in the indoor open when it does not need a key, directly screw the building spherical body can open the door. The key is not needed, directly screwing the inner door sphere can be opened.

Security, stability is extremely important

Door locks as security products must have security, stability. Security can be measured from two aspects:

One is to resist vandalism, mischief and intentional prying, drilling and other violent damage. In this regard, the mechanical strength of mechanical locks and electronic door locks are generally able to meet the requirements. In all types of door locks, only the radio frequency card electronic door lock is fully closed structure, its security is the best.

The second is to prevent the technology to open, the mechanical lock of the anti-technology to open the ability is very poor. No matter what kind of structure of the mechanical lock can be opened by other means. The key can be copied is a great security risk. In the electronic door locks, magnetic card because there is no password restrictions, the key card is easy to be copied. IC card and radio frequency card completely solved the problem of preventing technical open.