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For many people especially the aged leaving home, it's hard to judge whether they have locked the door. No one could give them the answer unless they go back to check it, which takes time and energy. Designed to solve the problem, Smart Key can give you the answer by showing different colors depending on the situation. When you lock the door, the mark on the key turns green from red. When you unlock the door, it turns red from green. In this way, you can check it easily.Smart Key is not intelligentized but mechanized to make it popular with the public. Moreover, for the aged, it is easier to recheck simply by looking at the color on the key.
Jin Cao Yong Wang Jinghua Zeng Xiaoliang Wu