Docooler&reg; Botla BTL-G001 Bone Conduction Headset Wireless Bluetooth 4.1 Earphone Outdoor Sports Headphone Hands-free with Mic Black-Blue [Ear-free Keeping Danger Away] Release your ears to listen the world, you can response to the surrounding situation quickly, far away from dangerous, suitable for many indoor and outdoor activities. [More Comfortable and Healthier] The sound transmits through the bone to auditory nerve, no eardrum damage, healthy, scientific and comfortable, very good for child, the young and the old to avoid ear damage, also suitable for people who has trouble in listening. [Keeping Ear Disease Away] No need to put into ear, easy to clean, avoid ear disease caused by sweat in ears when excercising. [Perfect Sound Quality] Built-in high-performance Microphone and Speaker, offering you perfect sound quality and clear communication effect. [IPX4 Sweat-resistant] Sweat-resistant design with Nanotechnology (Up to IPX4) immerse you in sports and music, no need to worry about sweat and water.