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This wireless mouse, affectionately named Corky due to its cork design, requires no batteries to stay powered up. Instead, it generates all the energy it needs simply through the movement of your hand. There is a piezoelectric element on both the right and left click buttons, and kinetic energy is generated when the scroll wheel is turned or the mouse is moved from side to side.

Source :http://www.mnn.com/green-tech/gadgets-electronics/photos/new-green-inventions-15-cutting-edge-items/andrea-plant-based-