looking at possibly adding this to my traverse but have a question on installation. How does this install? will this only work thru the stereo or does it work independent of the stereo such as an aftermarket pair where the sounds comes from the units? I have the base stereo on the LT1. I w did not want to run wires thru the truck, was looking to be able to just plugging it into the cigarette lighter with an adaptor. If anyone can give details on the install, would appreciate it.