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When using common charging plug, because the wire to produce a number of issues. For example, Part of the wire can not bend a large angle, and excessive bending can lead to damage to the skin of the wire, resulting in security issues. Pulling the wire will cause the plug to be separated from the socket. The above problems are from the angle of the bending angle of the plug wire, by adding a ball in the plug and let the ball instead of wires to connect the power, it can achieve a 360 ° rotation of the wire, let the wire more flexible and reduce damage.