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Nowadays, electrical plugs are mostly exposed outside. For one thing, it can be easily stained, and tramped down when falling onto the floor. For another, if a plug winds down, people might get an electronic shock and it is not safe. The plug, which is designed with a helmet, can be a good solution of these kinds of problems. The top of plug is composed by an elastic stretchable cap, LED lights and a fixed hard plate. It is convenient to be used at night.
Ningbo Institute of Technology, Zhejiang University