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When people open a door with a key, one problem which bothers people is that they do not know which direction to turn the key. in a environment lack of illumination, it is also hard for people to find the location of the hole. In order to deal with this problem, we designd...by using a simple sign with the direction, people can easily know the way to turn the direction. The arrow sign has LED light so that it can be used as a flash light in the dark. This simple "design guide" will make people's life easier and avoid wasting time on unnecessary matters.