... C, Life span, no rusting within 30 years.Solar panel: A, Solar panel, amorphous silicone,mono-crystalline silicone,poly-crystaline ... span ≥5year , Gel battery: ≥8 yearsController, intelligent digital controller-A. Self development LED intelligent module(power consumption 0.06W ... system power.B. intelligent digital controller can save >80% power than the regular solar garden lights.C, Working duration ...