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The breakthrough standard letter three jacks receive a telegram the way, realizes the single round hole insertion with three copper circle's winding, realizes operating mode to purify.On plug's ring control lid is controls the plug copper circle receives a telegram or not the switch, an inside body's back plate in the rotation process and the foundation back plate fitting is the plug copper circle power supply, simultaneously plug surface caution light demonstration bright.When the plug draws out, the light will remind the people to transfer controls the lid.