Direct Shift Gearbox (German: Direkt-Schalt-Getriebe, DSG) is a dual-clutch automatic transmission which has two clutches with an electronically controlled gear selection. In DSG, when you turn the engine on and select Drive mode, one shaft selects first gear while the second shaft puts the next gear on standby. As the gearbox changes to second, the second shaft is engaged and the original shaft reaches third. As you shift upwards the sequence continues in a series of seamless moves. Because power is simply switched from one shaft to another, not only are gearshifts silky smooth, but they are also very fast - each change takes less than four-hundredths of a second.