'Window Plug' Portable Solar Charger Concept Design

Yanko Design is showing off a concept called "Window Plug," and it's very cool. It's a portable solar charger that you can stick on a window. It has a built-in battery that self-charges, but it also has a plug for accessing that power for your devices. So far, this is a concept only. In the comments, the creator said that he still has technical hurdles to overcome, not least of which is having the device generate enough power to meet the needs of a wide variety of devices. But I am lust with the...