Even when there's no available power, always put safety and security first. This solar LED motion activated security light with power reserve technology has a solar charged battery that provides 600 LM and a battery backup that provides 200 LM for use when weather prevents solar charging. Once fully recharged, the solar battery resumes its maximum 600 LM output. Features include a low battery indicator; 180 degree motion activated up to 40 ft range; twin lamp head; tool-free lamp head and sensor adjustment; adjustable on time up to 5 minutes; solar panel with panel cord management; 10 ft power cord for optimum light and solar panel installation; and an easy install back plate feature. It has durable rust resistant plastic construction and can be either wall or eave mounted. The solar lithium ion battery is included, however 3 C alkaline batteries are required (not included) for the power reserve feature.