I can confirm that it does have a constant "on" feature. We had ours set up in our big window with a spot light on him so people could see him from the street in the second floor of our house. It was awesome as he goes from 5ft 6" to about 6ft and then comes back down (but not straight up and down more on an angle.) We love this guy and we've used him for 3 seasons. The only negative side to this prop is that this past Halloween he got a pretty loud and annoying squeak. We never did figure out why but if he comes back out this year we will need to figure out where it's coming from and lube him up.
Here is our video of him (he's at the very beginning for about 5 seconds)