Portable smartphone charger Ampy ‘move’ captures the kinetic energy of the user’s movement and turns it into power the smartphone. an up and down motion works best to maximize energy production while using accessories enables it to be strapped to a knee for cycling, an arm while running or clipped to the waist for walking. it can be charged from a USB 2.0 or USB 3.0, and other proprietary charging adapters. ampy is about the size of a deck of cards and weighs about the same as a smartphone and contains an 1800 mAh battery, giving enough juice to get through the day while keeping it light and small.
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