What is necessary for fast charging? It says it won't work for some usb... well why not? does it need to be usb 2.0 or higher or is something else? I am plugging it into my desktop pc to charge.
Some notebook computers and other portable devices limit the amperage output of their USB ports. There really shouldn't be an issue with a desktop PC.
Alt-248 on the number pad = °
So if the thing I am plugging into does not support fast charge will the light still turn red or will it remain dim to notify me this setting will not work?