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Specification:Solar panel Polysilicon solar panel can charge 5.5V, 2.5W even in rainy daysBattery3.7V-2400mAh Built-in two 18650 lithium batteriesPower80WMaterialABS plastic + PCSize31.5*9.5cm/12.4*3.74inchCharging time6-8 hoursBattery lifeIt can be charged for 6-8 hours during the day,and can be Us..