This headband wireless bluetooth smart caps headphone includes headset earphone with mic, the headband is made in knitted material. Set-in MIC, available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answering phone up via the device. Set-in Li-ion chargeable battery, charge via USB cable, long stand-by time. The bluetooth version is V3.0+ED, and the frequency is 2.4026GHz-2.480GHz, and transmission distance is  30 ft or so, the li-ion battery is 3.7V/120mA, the charging time is 2.5 HRS, and the standby time is 60 Hrs, the
continuous working time is about 5Hrs. Great for sports.