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This is a pair of sports shoes. There is a headlight on the head of each shoe. The headlight can be used to light your way. As a result, with this kind of shoes, its no need bringing with you the torch or head-lamp when you are walking, exercising, or working at night. The electric power derives from the mechanical movement of personal walk. When you walk in this pair of shoes, then the mechanical movement will be transmitted to electric power that will be stored in the battery in the shoes. When the nightfall comes, press the switch at the back of the shoes, then the headlight can be used to light your way. As a result, it is green.
ZhaoBin& Chen feijun