What I have discovered by accident is that the ...... is by far and away the best call any turkey hunter could use. Of course that is classified infomation, I will check with the proper agency's and, if I get clearance to give that info out publicly, I will post it later, as I would certainly want to share it with everyone. I will say that it is like the "My Pillow" experience , there is no turning back once you have called in many, many gobblers with it. €:-)