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Powerful Solar Panels: Tough, lightweight, waterproof solar panels are embedded in each bag. The panels use high-efficiency mono-cristalline cells to charge devices fast. The Backpack, Converter and Messenger produce 1.35-4 Watts, meaning 2 hour in the sun will power 3 hours of iPod play time or 1.5 hours of cell phone talk time. The Generator produces 6-9 Watts, powerful enough to extend laptop runtime by 3-6 hours from five hours of direct sun. Battery Included: All Voltaic bags come with a removeable battery pack which stores any surplus power generated, so you have power whenever and wherever you need it - not just when the sun is up. The battery can also be charged using the USB cable and the optional AC travel or car charger. Easy Connection to Devices: All bags include standard adapters for common cell phones and other handheld devices. The Generator also includes common laptop adapters. Art. No.MS-B05(Li-ion battery)　　　Unit Price(FOB Shanghai)USDDescription:solar backpack　Power: 2.7W　　　Solar panelduall paneltotal panelBattery box　　　Backpack　　dimension180mm*130mm　output voltage(max)DC 5V　dimension46*30*19cm　cell typeMonocrystalline　output current(max)700mAhmaterial600D polyesterpeak voltage6.00V　　battery typeLi-ion　　　　　peak current450mAh　battery capacity2200mAh