A handy companion for on-the-go listening, the SONY WI-C310 Wireless In-Ear Headphones feature crisp, full-bodied sound and a lightweight, around-the-neck design. Whether at home or on the go, the WI-C310 headphones sound great and have up to 15 hours of battery life. And with a metallic finish and flat cables, they look just as good. Wireless audio with BLUETOOTH technology Up to 15 hours of battery life Metallic finish earbud housing and flat cable design