Don't fret the next time your phone battery dies unexpectedly! This innovative 600 mAh power pack from Coghlan's will provide you with emergency power to your smart phone, tablet and even digital camera when you're in a pinch. You can re-charge this device by USB, solar power and even dynamo cranking it when you're really in a tight spot! This portable power bank stores energy in high-grade lithium polymer cells for future use. The case is water resistant and stores easily in your backpack, automobile and bug-out bag.