If you're far from the grid and your smartphone battery is running out, you'd better have a backup if there are no other phones around. This recharger gives you power with a flick of the wrist.
Voltmaker is an award-winning, patented design and Indiegogo campaign for a USB charger that can give you emergency power by spinning the dynamo. The 6-inch, 10-ounce device can also be recharged on a standard outlet.
If your phone is dead and you're hiking in the woods, spinning Voltmaker for two minutes will generate enough power for a phone call lasting several minutes, according to the campaign. … Read more