Go wireless with BLUETOOTHSay goodbye to tangled wires and pulled-out plugs. The Sony WI-C310 wireless earphones come with BLUETOOTH wireless technology, you can connect to your device wirelessly and enjoy flawless, interruption-free listening, stream quality sound all day. Listen to your music in clear sound quality from 9mm drivers on the Sony WI C310 Bluetooth headphones. Wear all day, keep on listening with up to 15 hour battery and 10 minute charge for 60 minute playback, your music won't stop. And the behind-the-neck design on the Sony WIC310 in ear headphones is shaped for comfortable, all day listening. Easy hands-free calling. Conversation flows freely with easy hands-free calling, thanks to the built-in microphone on the Sony neckband headphones. No need to even take your phone from your pocket, easy operation with buttons. Use the buttons to play, stop and skip through tracks and adjust the volume on your Sony C310 earphones. For hygiene reasons we cannot accept the return of used headphones. Therefore, if a refund is required the product must be returned with the sealed packaging intact and unopened.