I was in a pickle as my old legacy Marine Air Passport Vector control stopped adjusting temp up or down. Could not find any stock due to age, and of course Marine Air does not make them any more. My service tech suggested this touch screen substitute...it is so simple to operate, and really updates that older marine air conditioner. Out of the box (along with an updated board) and it was working right away. The touch screen is very intuitive to operate...however if you want to get complicated, there is a 44 page manual to explain all the things it does. I am okay with the on-off, raise-lower temp, adjust fan, adjust mode functions LOL.