The Personal Power Generator is just a concept but it’s very ‘green’ as it uses Kinetic Energy. Your walking and running will not be put to waste since it converts energy that can power most of your gadgets.
A minute of walking is said to power an iPod Nano for another minute so it’s 1:1 ratio. A smartphone however, needs 15x more energy so walking for 15 minutes will only give you an extra minute to use your phone.
More of this at the CES 2011.
(techfever)