Waterproof bone conduction headphones

I have heard about this bone conduction technology and I really would like to try it sometime. It seems eerie and weird since I am used to the traditional earphones. This bone conduction headset is made by Morito and presented at Wireless Japan 2007. What's also cool about this headphone is that it's totally waterproof. Good for the beach or pool. It will be available around August and will cost about 80 $ US.