One of these turns on our tv. But I need two of them if I want to watch say, a dvd. I also need two of them ~ and, our computer must be turned on ~ if I want to watch something off of Apple TV. It has taken me, well, a very long time, to get it all sorted out, so that I finally now exactly what to do with which one.
There are two more remotes, not pictured here, that are also part of this collection, and I have no idea what they do. I suspect, however, my 11-year old could probably tell you.