The PIE FRD03-AUX converts the 24 pin and 16 PIN headunit connectors of your FACTORY RADIO into an auxiliary input with an RCA connector to provide you digital sound quality. With this converter installed you can connect and listen to any external audio sources such as IPods, IPhones, IPads, XM Satellite Radio, MP3, Video Game Systems, DVD player or any other device that has headphone/RCA audio output without using an FM modulator or transmitter. To aid in the installation of external audio devices we are now offering a FREE 3.5mm to RCA Cable that will plug into any device that has a head phone jack (3.5mm output) that can then be connected to the Auxiliary Input Converter to provide audio. Ford Vehicle Fitment: Crown Victoria 2003-2004, Escape 2004-2007, Freestar 2004-2005 (With radio models 3F2T-18C868-AJ or 3F2T-18C869-AJ only) and Mustand 2004. Lincoln Vehicle Fitment: Aviator 2004-2005, LS 2004-2006 and Towncar 2003-2004. Mercury Vehicle Fitment: Grand Marquis 2003-2004 and Marauder 2003-2004.