It's a Dension D2B Gateway 500. Compatible system is the Mercedes gateway unit. I upgraded to the latest GW500 D2B firmware which is a lot newer than the last Jaguar specific firmware. the latest update allows greater iPhone compatibility and gets rid of any screen locking on the iPhone when being used with the ACM. I bought an official ACM unit from a jag dealer as the non jag GW500's I found were more expensive and wouldn't have contained the correct fibre cables. Updated with the non jag firmware no problem!