Wire Harness and Antenna Adapter. Use to add an aftermarket radio to the factory vehicle wiring. Standard wire coloring usually will connect color for color to aftermarket radio's wire harness. Important Compatibility Notes: Will require you to run a separate 12 volt ignition power wire to new radio since that wire will not be available on the factory harness. As long as you know how to locate and connect that wire then you will save some money- if you don't know how to connect then we don't recommend this harness and you should purchase the harness that is about $40+ more that has built in adapter for that wire turn on. This harness only works with regular factory audio systems- Not compatible with premium systems- if the factory audio system is the external amplified type like Infinity, Bose, Boston Acoustics, etc then this harness is not compatible. Will not retain warning chimes. Will not retain some features that go through the radio like warning chimes, OnStar, rear dvd, steering audio controls, etc.- other adapters are needed for retention. Avalanche, Express, Savana, Sierra, Silverado Suburban, Tahoe & Yukon vehicles equipped with a non-navigation radio are not compatible- different connector. Compatible Vehicles: No premium system/No factory external amp- Buick Regal 2011-2013; Made for Chevrolet: Avalanche w/NAV 2012-2013 , Camaro 2010-2015, Cruze 2011-2015, Equinox 2010-2017, Express w/NAV 2013-2015 , Malibu 2013-2015 , Silverado 2500/3500 w/NAV 2014 , Silverado w/NAV 2012-2013 , Made for Sonic 2012-2016, Spark 2013-2015, Suburban w/NAV 2012-2014, Tahoe w/NAV 2012-2014 , Trax 2015-2016; Made for GMC: Savana w/NAV 2013-2015 , Sierra 2500/3500 w/NAV 2014 , Sierra w/NAV 2012-2013 , Terrain 2010-2017, Yukon/Yukon XL w/NAV 2012-2014