I invented something that is wired headphones listening to the 4, and I think this will be useful. When I was listening to music and hear a lot of people. I do not have to turn on loud music disturbing others.To listen to music for up to 4 people, thereby sharing the music we're listening to the others. And also I have shared music with a group. Rather than separate songs in different angles.And when completed, it can be folded in conclusion,.I think what made this up in order to share my music with others.