Patent ID: 6932645

Claim:
A signal plug comprising: a) main plug part having: i) a metallic receiving portion; and ii) a line connecting portion inserted into the metallic receiving portion and having an insulation member, two metallic pieces separated by the insulation member, and an insertion-connecting portion formed on a front end thereof; b) an external sleeve connected to the main plug part and having a hole on a first end thereof, the insertion-connecting portion protruding outwardly from the hole, the external sleeve having: i) a second hole located on a second end, the second hole communicating with the first hole; ii) two lock holes on the second end thereof; and iii) an opening in a peripheral wall; wherein a first metallic piece of the two metallic pieces includes a barrel having a plurality of blades, the insulation member is located in an interior of the barrel, a second metallic piece of the two metallic pieces includes a prong piece protruding from a center of the barrel, the line connecting portion is made of copper.