usefull thing the didgi tacho letting itself total the amount of driving time you occur before your break after 4.5 hours.This enables so you can drive up to the limit .You can see for yourself if you press once one of the 2 arrows. the one facing up or the one facing down whilst driving or stationery when the screen is on the normal running screen. Four figures come on screen the driving symbol counting every minute.
thing is i read that an audible warning occurs 15 mins before the 4.5 is due and i waited and drove waiting for it until i looked up and a message said no break so i drove 30 mins over the 4.5 time oops…but its usefull than having to fiddle with a watch or guess