It was used electronics. You always take a chance with such. For what I paid not worth the effort to return. Maybe between this one and the problem it has, and the different other problem my other one has I can make one that works.. I give it a unsatisfactory rating, as it Was advertised as a working unit, but clearly does not work 100%.
My old unit would set cruise but not resume.
This unit will resume, based on stuck hard coded data within the unit and hold at 82 mph, but it will not set at all.
Although the part was correct, it was defective. Engine speed ran away and would not shut off. However I sent it to a rebuilder and had it repaired. It was a lot simpler than trying to return it and look for another one.