Ivation Backpack High-Efficiency Solar phone charger in Portable Silicon Case &ndash; High-Capacity 3,000mAh Lithium Battery is Up to 400% More Powerful than Regular Panel &ndash; Charges Most Cellphones, Smartphones and Personal Digital Devices up to 3 Times &ndash; Thin, Lightweight, Waterproof & Shockproof Improved Efficiency for 4x the Power of Conventional Solar Cells in Same Panel Size; Works Even w/Weak or Indirect Sunlight Soft, Waterproof, Rain Resistant, Shockproof & Dustproof Silicon Housing for Use Even in Bad Outdoor Weather Conditions Thin, Lightweight Design w/Hook Hole for Camping, Hiking, Biking; Hook Onto Backpack or Place on Car Dashboard Under Windshield Built-In Lithium Battery, USB & Micro USB Ports to Rapidly Charge Most Cellphones, Smartphones, Personal Digital Devices; Includes USB to Micro-USB Adapter Can be Recharged via Solar, via Included USB Cable to Computer, or w/Adapter to Wall Outlet