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DC plug, used for laptop to convert 7.9 x 5.5 to square port with pin. Suitable for converting the power interface of for notebook to for ultrabook square port with pin. The interface is for 7.9 x 5.5 female, and for ultrabook square male port with pin. Two-core line, good workmanship, not easy to damage, you can use for a long time. Thick line core, new model square port with pin, equipped with IC chip, and suitable.