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As the name suggests the socket of optional is unconstrained and convenient. The use of special is similar to the insulation of jelly and conductor material. Have it you will never worry this problem that the plug hole not compatible with plug or get annoyed on account of it is difficult to aim at plug hole. You can arbitrarily plug of your socket at any location. It is not only Convenient and very interesting but also never worry it would have happened electrical shock by using the insulation material of special.