Solar Paper is a solar charger, which can charge any smartphone in about 2.5 hours. It has the similar charging speed as a wall charger. It can charge any device via USB cable.
It also has a feature that shows the power generating condition, because It is good to know whether the charger is working fine or not at certain weather conditions. Solar paper has LCD that shows the exact load current (the amount of electrical current passed from a power source to the device that is receiving the power) that Solar Paper is generating.
The project campaign is on the Kickstarter and already has reached its funding goal of $50.000. The 5W Solar Paper costs 69$ and estimated delivery is on September of 2015.
Related post: Portable Solar System