Off-grid charger lets you generate enough juice to make an emergency call.

At the times when your phone is about to run out of energy, it's safe to say you probably have plenty to spare. The Voltmaker is a device that allows you to make use of that extra energy in order to charge your phone – all with the flick of a wrist.

A hidden rod that is normally secured to the body using a magnet can be released using a spring-loaded mechanism. Once released, you can spin this rod by shaking the device a lot like a rattle, a movement which allows it to harvest kinetic energy.

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