Marsboy Bone Conduction Wireless Sports Bluetooth Stereo Headphones
Listen simultaneously to your music and your surroundings. Sound waves are transmitted at a frequency that can be conducted through the bones of the skull. Your ears remain free, therefore you get to hear twice as much, without compromising on comfort, quality or style.
More information: https://www.amazon.com/Marsboy-Conduction-Wireless-Bluetooth-Headphones/dp/B012D1LD36/ref=sr_1_4?ie=UTF8&qid=1469039493&sr=8-4&keywords=bone+conductive+headphones