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Protection Tool: Equipped with device to avoid overcharge, over release, short circuit, over loading and solar battery inversely connecting. Circuit of tandem type: Solar charger controller adopts PWM main charging circuit of tandem type to effectively improve charging efficiency. Correct discharge control: Use the battery discharge rate characteristics to correct discharge control. LED indicator: The LED indicator shows the batteries current situation to make the customer get the information of the batteries. Three operating modes: Three operating modes can be selected: normally open mode, the pure light control mode and light control plus timing mode.