Healthy Recharging

What will you do if your gadgets battery lose it power? Of course you will recharge it, right? For that, you have many options to recharge it. You can use Travel Charger, USB charger, or other kind of charger. But all of that chargers need some electrical power to recharge your batteries.
The question is,how to get that electrical power? There is many ways to get it.
And guess what? Soon you can use your body to gaining some electrical power to your charger!
It's called Knee Dynamo, a gadget that will transforming your body energy into electrical energy. How it works? Put this thing on your knee, and what you have to do next is just walk. Easy right?
Every time you move this thing will transforming your body energy into electrical energy. From now on, let's get sweaty and full recharge!