This package includes a radio replacement interface module, a dash kit, antenna adapter, and a flush mount USB cigarette adapter for the installation of an aftermarket radio in select 2003-2006 Silverado, Sierra, Tahoe, Suburban, Yukon, SSR, Colorado, and Avalanche vehicles. The radio replacement interface module retains OnStar, factory Bluetooth, rear seat audio controls, BOSE audio systems. It however does not retain climate control steering wheel control but it does support dual zone audio functions.