| CPC H05K 5/0247 (2013.01) [H01B 17/26 (2013.01)] | 20 Claims |

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1. A plug comprising:
a metal body comprising a first surface facing a receptacle, a second surface opposite the first surface, and a first through-hole penetrating from the first surface to the second surface;
an insulator disposed in the first through-hole and comprising a third surface disposed on a side of the first surface, a fourth surface opposite the third surface, and a second through-hole penetrating from the third surface to the fourth surface; and
a conductor pin disposed in the second through-hole and protruding at least from the third surface,
wherein the metal body further comprises a first groove disposed in the first surface, and
wherein the first groove is spaced from a first outer edge of the metal body.
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