Audiosharp AS0849 Lightweight Sport Wireless Bluetooth In-Ear Headset with Mic and Volume Control (Black) Secure and Comfortable Fit. Magnet Adsorption Design allows you wear it like a necklace around your neck. Sweat-,Shock- and Dust-proof Design. Provide durability for sport use. Bluetooth 4.1 Technology. Easy to pair and Stable Bluetooth Connection. More time to play. Standby Time is up to 160 hours, Calling Time is up to 8 hours, Music, Play Music for up to 6 hours.