I don't think the trigger adjusts. But you should get a pull weight of around 4lbs, which is much less than the true revolver Umarex guns. And good accuracy. My impression on a brief test fire is that the trigger resets well, so the initial long first stage is not felt (or felt less) in rapid fire.
Did I mention that it is HUGE (not good), PLASTICKY (who cares? Well, some people do), and VERY NOISY (not good unless you live in a remote location)?
Pity Umarex haven't taken the design principles of the DE into a more sensibly-sized, less plasticky pistol, ideally with a barrel fitted for a suppressor. That would be cool.