... Environmental with Solar Energy2, Energy-saving with Low-power Consumption LEDs3, No Constraints of City-electric with DC12V4 ... 2, Installing the whole item on the scheduled place.3, Adjusting the direction of solar panels, generally, ... sure it is clear to be seen.3, Turn off the power switch in order to protect the ... charging.4, Please replace the battery after 2-3 years when the battery is out of work ...