its a computer controlled mechanically operated twin clutch transmission with 2 input shafts to the gearbox. each shaft has its own clutch hence the dual clutch, only one shaft is energized at a time while driving. while the other isnt being used the computer is constantly selecting the next gear to be used so it is ready for the shift all that has to happen is the release of one clutch and engagement of the other which happens within a fraction of a second to each other. its better than having a dogbox in a street car.