WiWU Air Conduction Marathon Ma 1 Headset With Magnetic ChargingEnjoy bone conduction earphone technology with catchyjo Life waterproof and sweat proof, Exercise without scruples, Layers of protection to protect sweat from backflow. Avant garde open ear design: bone conduction black technology does not need to be in the ear. Not listening to music Exercise is safer: Open both ears to maintain awareness of the surrounding environment and safer exercise. No earplug design Painless wearing: Using bone conduction