This is a new Peripheral Electronics MAZASX (also known as the PAC Audio AAI-MAZ) auxilliary input audio adapter for select Mazda vehicles. If your vehicle is equipped with a factory CD changer, it will have to be disconnected to use this adapter. From Peripheral's compatibility table, applicable vehicles include: 2004-2007 Mazda 3 2006 Mazda 5 2006 Mazda 6 It provides a stereo audio input (or addition of select aftermarket CD changers). The Aux input can be used to play an iPod, MP3, DVD, Sirius/XM Radio or other music source through your car stereo. The input is clear, without the static or interference from an FM transmitter. I have a mobile electronics installation business, and am selling off some excess inventory. Please feel free to send a message if you have further questions about any of my items. Thanks for looking!