I call everything by my own naming conventions barely know what I am talking about, i guess it is a 2 stage Jake Brake, and it is 5 minute change with the computer from default 6th gear to 4th gear, Jon set his at 5th I think he said, but I really like my setting at least for now in 4th, and can adjust the amount of braking action with the first or second detent on the toggle switch or non at all.