Bushnell Bear Grylls SolarWrap Mini USB Charger Compact, lightweight solar roll with integrated high capacity li-ion battery Solar charging and power storage charging your devices when you're off the grid 2200mAh Li-Ion battery on-board to charge your smartphone, MP3 player, e-reader or action camera Battery charges from a USB power source in 4-hours or 10-hours from the sun Single USB output compatible with nearly any USB powered rechargeable device, Micro-USB input for pre-charging with included USB/Micro-USB cord