The value you enter is the value it will be set at. For instance if you want a dwell value of 17ms you'll have to pull the trigger 17 times. Once the value is entered this is confirmed by counting the number of times the LED light flashes, which in this case should be 17.
If you were to enter a dwell value of say 3ms, you would see the led light flash 5 times (5ms) as the minimum is 5.
Hope this helps.