So, I'd be lost without this app! Now I've already my Kindle Fire HD converted to read in white letters on a black background (which is much more pleasant than the black-on-white variant). If I had never before imagined! But to read in real darkness of the screen is still too bright. The ScreenDim App I can now set the brightness down much further. I accepted to 0.8% (which I still properly light appears in the dark), and it would even darker. Perfect, my eyes last longer by and the battery too! I had to just get used to it before the closing of the Kindle Fire at night the screen brighter again, otherwise I saw the next unfolding in daylight only a black screen (because to set duster) and could barely enter the PIN to unlock the Kindle. Presumably there is a setting that could automatically adjust, but I have not found right away and felt so far also not the urge, great to look for it. Although I therefore the true functionality of the app probably not even erahne, it is so worth it to me already at least five stars - with one click I switch it on, and for the day in the dark just enfach again :-)