It took Amazon 2 trys to get me the right product. At first they just sent me the interface. Had to email them, then they sent me the XM tuner and antenna.Pulled out the RB4 factory navigation radio out of my HEMI Ram and hooked everything up. Hit the mode button and the screen came up on XM channel and I heard the preview channel. The only problem was I couldn't change the channel. Something with the interface doesn't control all the functions. As a test I pulled the RB4 and installed an RAZ factory CD/Tape deck and it worked perfect. Oh well...If only it worked with the navigation. It is a very cool product. Installed super easy and sounds way better than the XMs that run through the FM tuner.