Recently the company has reported that its system actually works and it's ready to be released next year. It says that six hours of cumulative motion can add 30 to 60 minutes of talk time to a mobile phone.
Inside the device is a lithium ion battery and a series of coils and magnets. When it moves, an electromagnetic field forms around the coils to generate electricity. The technology, developed in part at Boise State University, optimizes that field to match the slow frequency of human motion and draw a usable current.The company is also testing how much charge it can draw from the vibration of vehicles. The amount of charge a generator can make varies a great deal with the amount of motion.
(source)
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