Many times ago, i saw a blog about MB sd connect C4 for benz, the author said he like this tool very much, and make a comparison with mb star c3 for a result that MB STAR C4 is much better than c3, I was not too much attention to it. However, a month ago, i also saw a thread on an auto fourm about obd2 tools, the generl mean about the thread is Mb Star C3 is better C4. i think it's a question, so i want to serach some infos on the internet. Many people on the internet all said the MB Star C3, C4 software is the same, C4 whit SD CONNECT also with this software, and for the hardware, C3, C4 is much stronger in anti-interrupting ability, when C4 tests cars, it’s hard to influence by the environmenr outside, such as magnetic field，noise. C4 is much smaller in the appearance than C3. C4 is same function in diagnosing. Benz compact 4 SD-Connect is a latest Benz wireless multiplexer. It will connect to the PC by wireless connection. The biggest difference, i think, is connection wiring mode, C3 need 232 port, but C4 can be used with network port, even wireless. Also, the price C3 and C4 is very different, now C3 is the half price fo C4 as far as I know. could you some guys add more infos? i want to know more, thanks.

 New Mercedes Benz Star C3 is a professional diagnostic tool specially for mercedes benz cars. Mercedes Benz Star C3 can do benz trucks and new types of mercedes cars. Super quality, Big aluminum box for package, easy to take at hand. And Best quality MB SD Connect Compact 4 supports reading & erasing trouble code, reading the real-time data of sensor and actuator, coding and programming. MB SD Connect Compact 4 supports wireless diagnose, support K-line, CAN BUS and UDS protocol, fit all computers, with multi-language.