All in Two Solar LED Street Light: 15W / 20W / 30W / 40W / 50W / 60W  MPPT Solar Controller & Lithium Battery are built inside of Light Head.  Working time : 12 hours / day ( battery fully charged )  Lighting mode ( default setting ) : 3hr 100% brightness + 5hr 50% brightness (increase to 80% when people are detected by sensor) + 4hr 30% brightness (increase to 80% when people are detected by sensor) Warranty : 2-Year for complete light fixture Advantages : 　 　 Battery and solar controller, sensor are built-ins...