Charging up your phones with these devices would be off the edge. Just stick the thing on any window or glass against direct sunlight and boom the harvested solar energy is stored in a 1000 mAh rechargeable lithium battery can be used to charge phones and other devices. It can definitely be a powerhouse for people who travel a lot and save the hunger of electricity to a great extent. Probably these kind of devices can push the world one step further towards next generation of energy use.