Wiwu MA1 Marathon Wireless HeadphoneWIWU MA1 MARATHON WIRELESS BONE CONDUCTION HEADPHONE PRODUCT DESCRIPTION: Avant garde open ear design: WiWU MA1 Bone Conduction technology does not need to be in the ear. Open both ears to maintain awareness of the surrounding environment & safer exercise. No airplug design painless wearing: Beautiful sound quality, while eliminating the swelling caused by the traditional in ear style, it is really painless to wear, make the appearance as good as the