What I really want is that imaginary headphones to listen to a 4 wire and I think this is useful is when I'm listening to music with friends and listen to the request of several people. Cause I don't want noise music. Makes it possible to listen to music together for up to 4 people, so as to share the songs that we are listening to others and also make me live music to people as a group rather than individually, to listen to each other in different angles. And when finished, you can fold. In conclusion, I think this piece of invention and want to share them with others, listen to music, I.