What's the slot in the center console for?

[Donner]

What's this??

Anyone know what this is? Just the gray pigtail and plug... It was plugged in the first time I was in there, this time, I guess I forgot to plug it in... any idea what it does? None of the interior accessories were affected.

 

[lincolnhighway]

Its also for losing things - my leatherman tool was hiding in there for three months