Compatible for Mercedes-Benz ML (2005-2011) / GL (2005-2011) / R (2005-2011) Compatible for Porsche Boxser (2005-2011) / Cayman (2004-2011) / Cayenne (2003-2010) / 911 (2005-2011) This adapter is required in vehicles that have the original COMAND APS NTG (Most Bus Based Systems) 2 or COMAND APS NTG 2.5 system. Please note that this optical fiber decoder box can NOT decode the D2B Optical Bus System (COMAND 2.0 & COMAND 2.5) To identify whether this optical fiber decoder box can decode your vehicle's COMAND APS NTG 2 or COMAND APS NTG 2.5 system information, please check your vehicle's plug port with the following information in product images.