Picked up a new gadget for camping and more importantly, for the wifee to take on her long trail runs. Just got it, so will need to test it out first. It came 3/4 charged. I stuck it in the sun outside for about 2 hours or so and it appears fully charged. Water and shock resistant and supposed to be able to charge an iPhone at least twice. My favorite is the Solar Joos, but my wife will never lug that thing around. The Joos is about the size of an iPad in a case and weighs about as much. But that thing works great, is waterproof and seems bullet proof. For real, someone tested it by shooting it five times, I think. And it still drew solar power and was able to charge the intended device! The Levin is about the size and weight of an iPhone in a case and is shock and water resistant. So it is supposed to handle a drop and some rain. While the Joos is more powerful, they have pretty similar capacity. And both can by charged via USB. So before camping and before a long trail run, I will be topping it off. I'll give a longer term review later after we have used it a bit. Intermittent Hawaiian sun and clouds topped off the remaining 1/4 in around two hours.