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    Product characteristics: 1, the inside, outside door automatically lock the function;That product has the inside, outside door the trouble for purpose for hand handle for automatically locking the function, bing the head of family go outing or in the room pass door, will locking up lift( start to automatically lock the function), have noing needing using key can immediately realizing lord locking the tongue tee offing the safety locking the door, validity avoiding the customer in the egress or in the room pass door hour usually wanting the key. 2, urgent open the function: computer key slot lock head, automatically change the syncline tongue, building inside to take the insurance device, and design the skillful and outside light, and have to feel comfortable, operation convenience etc. characteristics, extensive be applicable to every kind of defend the door.Its match each other with handle of different front-panel hand a set, the formation is each from the different style, deep suffer the liking of large customer friend.