As far as I know there are 3 models right now.
Digital is just a digital model
Digital Pro – same thing but it gives you an option to go faster for a short time to recorrect direction faster or change speed on occasion, this is handy I know for me on the pond
Digital Pro 2 – Same as Digital Pro but gives you finer speed adjustements.
Click here TROLL MASTER for their Web-site. You can order direct from the factory and get quotes from them direct. I beleive you save a little money! Good Luck. I’m looking at getting one this Spring!
They say if you got any Mechanical background, they are not to hard to install by yourself .