1. When the battery runs low, the red LED will flash every 6 seconds.
2. Recharge the CK11 by plugging into the supplied car charger, USB charger or PC USB port.
3. It normally takes 3 hours to fully charge the battery.
4. The LED will turn red when charging and turn off when charging is completed.
5. Charging requirements: DC5.0V/ 500mA-1A.