Features: Provides wireless freedom to you,which is a fashionable outdoor product designed to remove any inconvenience of using earphones or a headphone for listening to music/take calls outside V3.0 + EDR Bluetooth version, available for most of devices with bluetooth function Knitted Materail, fashion and keep warm with answer the phone in winter Built-in speaker, bluetooth Technology , It not only functions as a hat but also provides quality sounds at the same time, it is the best choice for the people who love fashion and sports Built-in Li-ion battery, charge via the USB cable, long time stand-by Specifications: Bluetooth: V3.0+EDR Frequency: 2.402-2.480G Battery Built-in: 3.7V/100mA Li-on battery Effective Range: About10m Charging Time: 2H Standby Time: About 1H Working Time: About 3.5H Circumferance: 40cm (elastic) Package Include: 1 x Bluetooth Headband 1 x USB Cable 1 x User Manual