This is a Soundgate AUXMSTVL1 V3 dual auxiliary audio input adapter for select Volvo vehicles. It is also compatible with Alpine M-bus radios that use the M-Bus for connecting a CD changer. This adapter enables the CD changer port of the radio as an stereo auxiliary input, instead, so a stereo music source can be connected. It provides dual stereo audio inputs to play an iPod, MP3, DVD, smartphone, Sirius/XM Radio or other music source through the factory-installed car stereo or Alpine M-bus radio. The input is clear, without the static or interference from an FM transmitter. From the unit's application notes, compatible vehicles include: 1998-2002 Volvo C70 1998-1999 Volvo S40, S70, S80 1998 Volvo S90 2000 Volvo V40, V70 1991-1997 All Volvo 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!