Bushnell PowerSync SolarWrap 400 Portable Li-Ion USB Charger 100% quality materials used and tested extensively Beautiful design and durability built to last Packs plenty of power in a compact lightweight continuous roll; flexible solar panels roll up into the integrated and easy to pack protective case Solar charging and power storage for charging your devices when you're off the grid On board high-capacity Li Ion battery; power gauge provides easy to read battery level indicator Battery charges from a USB power source in 4-hours or 3.5-hours from the sun; high solar collectivity even in less than full sun conditions Single USB output compatible with nearly any USB powered rechargeable device, Micro-USB input for pre-charging with included USB/Micro-USB cord