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It's messy to open a door at night,since to find the keyhole is very inconvenient.However,with the"light-key"which can give out light,what you have to do is just pressing on its round button when you open the door.And with its light,you can find the keyhole quickly and open the door easily.Moreover,different colors represent different rooms.Make life easier...
Ningbo University of Technology
ningbo, China
Yawei wang
ningbo, China