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Everyone knows rules of how to use electric outlets safely but most of them don't follow these rules. A fact is that they don't use any safety items such as safety caps choosing convenience over safety. A dual structure of Plug ON's connection part is devised by applying a distinction of each kinds of plugs having same wideness and its hook inside of its inner section of connection part lets only plug to open the socket. Plug ON is a socket that can be used safely as the socket itself has the function of a safety cap.
Cheonan, South Korea
Seoul, South Korea