Three, with multiple security and self-locking function, do not need any other door equipment.
具有多重安全保障及自锁功能，无需别家任何栓门器材。
It can not only be of direct switching function, but self-locking switching function.
它既可以具有直接的切换功能，也可以具有自锁切换功能。
It can not only be of direct switching function, but self-locking switching function.
它既可以具有直接的切换功能，也可以具有自锁切换功能。
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