I have been using a Thermocell for about 4 years now and love it,i have 4 of them,Iuse it for Turkey,Ducks and also Deer, i have had Deer under my treestand with it on, For what i have been told it is a natural accruing insect repellent so it dose not spook Deer, but what ever it is, it works
i also use one with the scent pad set-up to help with deer lure scents
you just snap on the pad hold and load the pad with your favorite scent lure
Lenny