Bushnell PowerSync SolarBook 850 Portable Li-Ion USB Charger Durable, flexible solar panels fold up into a compact and easy to pack protective case Solar charging and power storage for charging your devices when you're off the grid On board dual high-capacity Li Ion batteries; power gauge provides easy to read battery level indicator Battery charges from a USB power source in 6-hours or a mere 3.5-hours from the sun; high solar collectivity even in less than full sun conditions Dual USB outputs compatible with nearly any USB powered rechargeable device, Micro-USB input for pre-charging with included USB/Micro-USB cord