Meet the Boost Band: a wearable device you can rely on to charge your smartphone on the go. This wristband has a 1500 mAh inside to charge your iOS/Android devices. It has a circuit with Mini USB input and USB output, so it can be used to charge wearables, cameras, smartphones, and other portable gadgets.
More gadgets like this: here
The above video shows how the band works. You can find out more about it on Kickstarter.
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