This is a Nicestuff 68785 (also known as the TL785 or NSD-68785 or NSD-TL785 or KRAM 69560) handsfree integration harness for use with select Volkswagen and Audi vehicles. This is a Telemute lead, which utilizes a telephone audio input on the vehicle's headunit itself, that is triggered to swtich over to the handsfree audio of the carkit when requested. Some of the compatible vehicles include: 2007-* VW EOS 2003-* VW Eurovan with premium sound 2006-* VW Jetta / GLI 2002-2005 - VW Golf / GTI / R32 with Double DIN (Mute and Tel +/Tel - shown on radio pinout label) 2002-2005 - VW Jetta / GTI with Double DIN (Mute and Tel +/Tel - shown on radio pinout label) 2006-* VW Golf / GTI / Rabbit 2006-* VW Jetta / GLI 2002-2005 - VW Passat with Double DIN (Mute and Tel +/Tel - shown on radio pinout label) 2006-* VW Passat 2008-* VW Tiguan 2004-* VW Touareg 2005-2008 Audi A3 without BOSE, without Navigation Plus MMI 2005-2008 Audi with Navigation Plus MMI, with or without BOSE 2009-* Audi A3 2006-2008 Audi A4 2009-* Audi A4 / S4, without Nav 2008-* Audi A5 / S5, without Nav 2005-* Audi Cabriolet with Navigation Plus, with BOSE 2007-* Audi Cabriolet, all with Navigation 2009-* Audi Q5, without Navigation 2008-* Audi R8 2007-* Audi TT 2004-* Lamborghini Gallardo * indicates it should be compatible through that generation of the vehicle platform On activation of the Mute line, the audio will switchover to the handsfree kit. You can also use this harness to integrate audio into your car stereo from other mono sources by triggering the mute enable line (navigation units, radar detectors, CB radios, etc.). A carkit-specific adapter harness may be required for your installation (I have some of these in my booth), or the connections can be made individually. Available on the connection to the carkit is: VBATT - constant +12V power supply Ground - chassis ground Ignition - switched +12V signal Mute - active-low trigger Mute connection Speaker (+) - differential mono audio signal from the carkit or device Speaker (-) - differential mono audio signal from the carkit or device 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. I am willing to ship this item internationally, but please contact me first so that accurate shipping charges can be assessed. Thanks for looking!