Wire harness for installing an aftermarket radio. Red ignition wire of the new radio has to be run separately from the vehicle radio harness (factory radio plug has no ignition power wire). Not compatible with factory external amplified systems like Bose, JBL, etc. Only compatible with standard factory audio system with no external amplifier. Will not retain steering audio controls. Compatible vehicles: -No Factory External Amp Vehicles/No Premium System- Made for Dodge Ram: 2009 2010 2011 2012 1500, 2010 2011 2012 2500/3500, 2011-2012 4500/5500