| 摘要 |
PROBLEM TO BE SOLVED: To prevent magnetic adverse effects from exercising on a magnetic card, etc., even when the magnetic card, a magnetic recording medium, etc., are mixed in a connecting cord for helmet when the connecting cord is carried. SOLUTION: This cord 5 for connecting a microphone 11 and a speaker 12 of each helmet 1 to a communication unit 4 is provided with a socket 3 on the side of a magnet freely detachably coupled to a receptacle 2 on the side of the magnet of the helmet 1 equipped with the receptacle 2 on the side of the magnet of a magnet connector at one end of the cord 5. |
