Charge your Phone while walking

Imagine never having to worry about your mobile phone battery running too low. This day might be closer than we think because very soon, we'll be able to charge our phones just by walking. Scientists at Cranfield University, University of Liverpool and University of Salford have developed a wearable device that produces electricity using the knee movements of the wearer. This device is known as the pizzicato knee-joint energy harvester and can be worn on the knee joint. It relies on a pizoelectric plucking mechanism to generate electricity. While still in the prototype phase it generates two milliwatts of power. The scientists behind this device claim that it can be improved in the future to harvest up to 30 milliwatts. Expected uses of this technology include, powering heart rate monitors, electronic equipment carried by military personnel and hikers and of course, charging your mobile phone by taking a quick walk!

Source : http://www.ubergizmo.com/2012/06/pizzicato-knee-joint-energy-harvester-converts-potential-energy-into-kinetic/