Before I begin my experience with tools of this type is limited. However I think the functionality for Benz (at least) could be improved, I bought this tool specifically to recalibrate airMatic was told it would and now my dash shows malfunction. Also a little cumbersome and the tool itself is a bit plastic feeling. Yes it talks to most of my cars modules but not all I have no audio, amplifier, rear door module or front seats according to the CR Max I’m a bit sad about my purchase