Vehicle Audio Steering wheel interface allowing use of original buttons with a new aftermarket head-unit.Use with Mercedes cars with Audio 5 & Sound 5 head-units.CAN bus and ISO connectors behind the radio.Includes Ignition , speed pulse, reverse, handbrake and illumination signals. This model is universal and can be used with Alpine, Blaupunkt, Clarion, Pioneer, JVC, Kenwood, Sony or Zenec Head-units.It is supplied complete with instructions and the patch lead for the new head-unit . Vehicle Compatibility Mercedes A-Class (W169) (2005 - 2011) Mercedes B-Class (W245) (2005 - 2011) Mercedes Sprinter (W903) (1995 - 2006) Mercedes Sprinter W906 (NCV3) (2007 >) Mercedes Viano (W639) (2004 > ) Mercedes Vito (W639) (2003 - 2014) Vehicle Models: The years stated refer to the model's years of manufacture, please check the item description for information about any changes there may be within these productions years.