Originally Posted by URBAN LEGEND
Found it too. Not sure for its use.
It's great for charging your phone. I got a Pro Clip mount:
And a phone holder with a charging cord:
I ran the wire through the seam between the upper dash and the center console back to the power socket. Nice clean installation.
Current: 2013 Monte Carlo Blue F10 M5 (ED on 9/1/12)
Previous: 2009 Carbon Black E60 M5, 2006 Silverstone II E60 M5, 2003 Sterling Grey E39 M5, 2000 Anthracite E39 540i6, 1998 Jeep Grand Cherokee 5.9 Limited, 1990 Eagle Talon TSi AWD, 1978 Mazda RX-7