What is a "hand-wound" cell phone charger?

What is a "hand-wound" cell phone charger?

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A hand-wound cell phone charger is basically a device that allows you to use the kinetic energy of your hand cranking this device and to create power. The power that's created, then, gives you at least enough juice to make a couple of phone calls, whether you're calling 911 or a family member. It's a good idea to have one around if you decide to buy a phone and keep it for emergency purposes only. In the event your car battery dies and your car charger's not working you have another way to power your phone in the event that you can't turn it on.