With a good old-fashioned hand crank, the self-powered SOSCharger allows users to plug in their smart phone, crank away, and produce the energy required to sustain a charge. Best of all, the device is actually quite efficient compared with other hand-crank devices. Churning for 3-5 minutes will yield 5-12 minutes of talk-time. In an emergency, that is exactly what you need. SOSCharger Kickstarter Project [Kickstarter]
