At a basic level, it needs a power source, a sound source, and you can choose the output for that sound by controlling the volume. It did a pretty good job for a while and still works in the mod, but there are some issues. I have computer speakers connected to one output and headphones connected to the other. However, I did notice that now that the headphones are selected, the sound leaks into the computer's speakers. To get around this, I have to individually minimize the volume on the speakers themselves, which kind of defeats the point of this thing. Reading some of the other reviews that had issues I think this thing usually works fine for a while and then eventually starts to have issues the longer it is used. In short, it's not built to last.
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