... -80w mono/poly crystalline silicon,life span=25yearsVoltage: 12v Light source: 5-20w electrodeless lamp,LED and so on, ... Non-maintaining lead-Acid battery,life span=5-8yearsController: Micro-computer intelligence control, defend to excessively refresh,excessively turn ... proof and automatically open according to the bright degree,pass light and time control,life span=5yearsWorking temperature: -20°c ...