These new set of headphones are not your ordinary headphones. They dont work out of water (or space). You need to be under water and they then vibrate in your ear (vibrate your skull to be exact) to produce underwater music 
They are selling in Japan now for $170... wow. LOL. Maybe a tad too expensive for the amount of times I have been swimming in the last 10 years. I am sure some will benefit though.
Via: Here