Details: 1>LED lights 4 colors change showing battery 2>E-firefly battery 3>CE,ROHS,FCC,SGS 4>High quality Oakleytech High Quality E-firefly Battery E-firefly battery special feature LED ring will shine 4 colors according to the power left in battery Blue75%-100% powerGreen50%-75% powerYellow25%-50% powerRed1%-25% powerWhite LED light flash,it is remindind you to recharge itFlashlight function Go ...