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Product Specification1, Solar Panel(mono or multi-crystalline): 5.5V/110mA2, Li-ion rechargeable Battery: 3.7V/2,000mAh3, Mini USB input: 5V/1A4, Output voltage/current: 5V/1A5, Self-charging time: 6 hrs (by laptop) 5hrs (by 5V/500mA travel charger) 18-22 hrs (via solar panel, under full sunlight condition)6, On/off button: press to start charging7, Power display: 4 LED indicators shows power level, each represents 25% of battery usage8, Protection: reverse current protection circuit integrated to prevent batteries from being discharged9, Size: 57mm x 130mm x 23mm10, Weight: 62g11, Color: black