This solar powered charger seems to be ultra portable and if you live in a well sunlit area, you may cleverly use the sun energy. Principle of operation does not seem to be complicated as the Sunny Flower gets solar energy to power its embedded battery that offers you a green charge whenever your devices are gone flat.
Another well thought feature is its indicator light that glows every time your electronic gadget is well charged. Once enough sun power is harvested, the charger takes shape of ultra portable stick as indicated in the picture to finally charge a gadget of your preference.