Wireless B luetooth drop-in headphones that work with audio-enabled helmets . These ski helmet headphones fit in the ear flaps of your helmet and make it easy to listen to music and make hands-free calls on the slopes. Water and sweat resistant with a premium 5.0 Bluetooth chip set. 10 hour battery life to give you crisp sound all day long. Tested in extreme cold and ready for your favorite runs. Patented design USD892764S1 .