... .7V support all phone,digital 4 LED indicator 1year warranty Aluminum alloy 4000Mah Single USB Solar power bank Specification:*Single USB ... output power bank, full aluminum case, under the cover*Polymer battery capacity: 4000mAh/3.7V ... : 1000mA*Output voltage: DC4.5V, 5.5V, 6.5V, 9V (set of 4)*Charging time: 12 to 14 hours (irradiance: 100mW ...