... computer by USB 2.0 cable, then download music and studying material2.Power supply: inlay rechargeable Li battery, use ... flash, it works normal. Red light flash, needs to recharge, after flash 1 min,headset shut off auto. Charging, ... light keeps flashing, light stop, the battery is full of power. 7.Press on/off button, it shut off ... 30s8.OEM are welcome. Wireless headset with TF card for PC and mobile