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All around the world, about 5/1000 people are blind. It is very dangerous for them to touch the power outlet, because they need to feel the jack with hands before plug it in.
The best way to solve the problem is separating the process of finding the jack and plugging in.
A design of additional protective sleeve was inspired by jigsaw. In this way, it does not only protect the blind from getting an electric shock, but also leave other people’s use unaffected .
Beijing Forestry University