I have two, the old and new version. They will pick up the heat signature from you spitting on the sidewalk in the summer, and the heat from where you were standing in the winter. They are pretty badass really, except for the fact that they are not recoil rated that is. So you can't mount them on anything that powerful or jumpy like a Springer. I drive down the road with it to "spot" deer at night. In mid to late summer you can see the buck's antlers because they are full of blood. Going in and out of the stand is one of it's biggest features so you're not spooking game, and to see if there's any predators stalking you as well.