... pipeline laying, the layout can be adjusted lighting, security of energy non-polluting, no manual work stable and reliable, ... property control system, and receive 20% -30% more energy efficiency than ordinary solar street lights. Long life, once ... -30 °C~ +55°CPanels: single / polycrystalline silicon conversion efficiency of solar panels, life expectancy ≥ 25 yearsBattery: Solar colloid, silicon, ...