This is a used wiring interface adapter for adding an AUX input for an iPhone, iPod, Android or basically any other MP3 player or device to a factory Chrysler, Dodge, Ram or Jeep radio that does not have an AUX port on the front. This particular model says its for Chrysler radios between 2005 to 2008. It's real simple to hook up, pull the factory radio out, unplug the two harnesses from the back of the radio(just the one big one if you do not have factory satellite radio), plug those into the female plugs on the adapter and then the male plugs from the adapter to your factory radio. Just use the mode switch in the radio to select the DVD input and you can actually have two things hooked at once because there's two separate pairs of RCA plugs to use. I don't have the install/user manual but I'm sure you can obtain one from pac-audio's website. Also, you will need an AUX cord that has the red and white RCA plugs on one end and the 3.5 headphone jack on the other. You can get this cable at Walmart for fairly cheap or at any electronics store.