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Our innovative door is invented for the solution. The structure of the door is made improvement. Electronic switch is installed in the door hinge. As long as the key is inside the lock, the door will keep open instead of shutting off.
Only when you back to drag out the key, the door can be closed as you wish to do at the first time. As a result, a feeling that the door was stuck to be closed arises, when you have the key keep plugging in the lock.
Many potential safety circumstances are reduced since the reminding works.
Her Shin Lou Siyu Zhu Yuye Guo Huizhuo