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Night to find the key to open the door always is a very troublesome thing, have in the evening light is poor, it is hard to distinguish which one is the key to open the door, and very easy to put the key back. This design can be this problem solved, we each key with a sensor light, and only if the corresponding door can be activated, when people at night to go to the door, the corresponding key will glow red, so that people can easily find the key to open the door, and the light can make people to distinguish between the key of positive and negative, avoid insert.
Chong Qing university
District Shangpingba Chongqing, China