I am currently installing the Imprint PXE-H660 into my car and can't seem to find any useful instructions or even a comprehensible explanation as to what the LED is for. Furthermore, why is its cord shorter than the one for the IR sensor? I was going to install them side by side and now I can't, unless I extend the wires. Do I even need to install it at all? From what I can tell, all it does is tell you that the processor is "on", but I would think that the music playing would give me a pretty good idea about that. So, what's the deal? Extend the wires or chuck it in my tool box?