Thanko Japan's creation of wacky gadgets is rather prolific, but this one is surprisingly useful! Slip in the small MP3 player into the water resistance pouch and put on the headband to enjoy your music as it is conducted through the bones below your ears, rather than through sound waves in the air.
It's not just neat technology--it is actually useful in many cases to be able to hear ambient noise while listening to your music at the same time. It also works great when earphones are not an option -- like in the pool or at the beach. (Or your office?) And the price is reasonable to get something this unusual and useful.