When the battery becomes low, the LED will flash red every 3 seconds, and you should recharge your 10B. Please charge by using the supplied car charger, USB charger or PC USB port. It normally takes about 3 hours to fully charge the battery. The LED will indicate red when charging and off when charging is complete.
Charging requirements: You can plug our supplied USB cable to your own USB chargers (wall charger/travel charger/car charger, etc.) with 5V/500mA-1A or PC USB port. It is OK to use most mobile phone chargers on the market.