Its bad ***, I ended up with it to the door for 825.00, some Lighting sale Sat eve. Mine is the Pro V4, I believe they offer a Pro + also. When it arrive it had to be updated so plan on all day for that. Still can only access the modules via the 38 pin since in my 99 slk230k they are not OBDII linked. The kit includes many adaptors and I have mine hooked up to the 38 pin and power will come from the battery via clamp terminals. Having never pulled codes via the Big pin I am going slow and waiting for it warm up. My 38 pin is under the cover in the box with the ECM. I understand that even if you have the adaptor with the foxwell510 it will not talk with the modules. Glad I know someone that has one , I can only assume the modules are called the same regardless and it shows it work on the R170 . We shall see.