its this model: http://www.amazon.com/Trophy-Ridge-PM1090-Mantis-Right-Handed/dp/B000IEWQW8 you sight it in at 20yds on flat ground and then it compensates for distance when you are in a tree stand. I used this when I was hunting public ground a lot and didnt have a guarantee that i'd be in the same tree more than once. Worked well. Hunt private property so I can take the extra time to figure distances and sight in for my permanent stands Make me an offer.
still have it! please don't make me an offer and then stop responding to emails....that's just rude. If you change your mind, just say so.