Zhda&reg; World's First Water Resistant Bone Conduction Bluetooth Headphone Zhda Brand Hearing Aid+bluetooth Phone+music Keep Ear Open Bluetooth Headset (golden) Bone conduction headset, second to none, send sound through the cranial bones, help people with hearing impairment to hear the world again, and also applicable to elders. Ear opening, keep alert of your surrounding while listen to music, and keep bacteria away Water resistant, shock resistant, and dust resistant. Can connect two device at the same time Bluetooth connectivity, support music play and phone call