How do trigger shifters work?

Can someone explain to me briefly, how do trigger shifters work? and why would I want to use one ?

Thanks.. Ben.

ok the shift is generally shortened but has the trigger to stop accidentally hitting reverse when shifting from first to second or third to second.

Ok cool.. So not of huge importance unless you are racing up and down through gears quickly.

Thanks Barls 🙂

not really but saying that the shorter shift can be good though just for general driving. ive had both the empi trigger shifter and the scat dragfast in my bugs and i like the scat. its a good solid unit with a short shift about 50% of stock.