If your iPhone runs out of battery quite often when you are nowhere near a power source then you may find the iFan helpful. The little fan-like device is attached to the iPhone to power it with wind energy. The fan looks like a conventional PC fan, with the difference that it does not need electric power to rotate, that’s taken care of by the wind! This obviously works best if there is wind around at the time.
It took about six hours to charge the iPhone fully which means that the iPhone can be used indefinitely for as long as there is wind around. Think of the possibilities. Maybe you are in the mountains, or at the beach. Situations with no power plug in sight. The iFan can supply you with enough energy to power the work with the iPhone all day long.