The difference of function between Compact 3 and Compact 4:
Compact 4 support wireless diagnosis.
SD connect can do wireless diagnosis. Besides, it use Lan cable connection. So it can support more model computer.
Support language: English, Germany , Franch , Italy , Spain , Portuguese, Finland , Denmark , Swedish and so on.
Interface components used the military quickly inserted techniques that can support one million times plug, more stably.
All of the core components adopt new original packaged chip, plus 24 hours fatigue test, to ensure product stable release.
Compact 4 support not only KL diagnosis and three lines CAN BUS diagnosis, but also UDS diagnostic treaty, because the board of Compact 3 didn't contain UDS treaty chip, the hardware will be eliminated directly.
Included refurbished laptop DELL D630 and prepared to use with "Mercedes-Benz SD Connect" diagnostic tool