This adaptor will enable you to replace your factory fitted head unit with an aftermarket model. It converts the cars power and speaker plug into a standard ISO connection, suitable for all aftermarket head units (Alpine, Clarion, JVC, Kenwood, Pioneer, Sony etc). You simply plug one end of the adaptor into your cars original wiring harness, and the other end into the new head unit. (With vehicles that have the new Fakra or Quadlock connection there is no ignition switched 12v supply. This is usually required for aftermarket head units, and they won't power up with out this being connected) Fits vehicle models including:  Vauxhall - Agila A (2004 - 2007)Vauxhall - Agila B (2008 onwards )Vauxhall - Antara (2007 onwards)Vauxhall - Astra H (2004 - 2010 )Vauxhall - Combo (2001 - 2011)Vauxhall - Corsa C (2000 - 2006)Vauxhall - Corsa D (2006 onwards )Vauxhall - Zafira B (2005 onwards )Vauxhall - Meriva A (2003 - 2010)Vauxhall - Signum (2003 - 2008)Vauxhall - Tigra II (2004 - 2009)Vauxhall - Vectra C facelift (2005 - 2008)Vauxhall - VXR8 (2007 - 2009) The above list of vehicles is a general guide and cannot be guaranteed in all cases.To ensure compatibility, we recommend that the vehicle connector pictured above is compared to the actual connector on your vehicle.