Pac Radio Replacement Interface for Chrysler Dodge Jeep and Select Models RP4-CH11 The new Radio PRO4 radio replacement interface comes pre-loaded with amplifier retention and steering wheel control (SWC) software. Navigation-based output signals and other features save time and money during installation. Features Radiopro4 RP4-CH11 Stereo Replacement Interface Navigation ready: Data-controlled accessory and navigation outputs Built in pre-programmed steering wheel control (SWC) retention Retains factory amplifier (In Premium Amplified Systems only two input channels can be used from the aftermarket radio, therefore there will be no fading capability of the aftermarket stereo) Provides factory RSE activation