I have seen one entrepreneur pitching for his idea in Shark tank for a portable charging device for phones on the run. The concept was based on how much you move and the device is some sort of capacitor that ll store energy and charge ur devices ... Their product might be in line with this... I may be completely wrong ... But I would say EPAZZ is doing great job with PRs and it has lot of potential in long run $$$$epazz$$$$