"the indicator will remain on at speeds of less than 10mph. However if the speed is above 10mph approx. then the indicators if activated will time out and cancel after 7 seconds. If the speed drops below 10mph before the 7 seconds then the indicators will remain on."
Beat me to it...though I sometimes get the feeling that there is also a random number generator involved in the cancelling of the indicators!
...and many thanks for putting the effort in to work out what the unit does. I also am very interested in having a plug in alternative ready for when or indeed before my indicator unit finally decides to give up the ghost.