I have never actually used one of these calls, but I believe the idea is the same as a crow call for a turkey hunter. Make the cackle, if one cackles back, you know there are birds in the area. Mysef, I prefer to just go hunt, someone is just trying to make a fast buck with these calls and until I see someone sit under a tree and call a pheasant in for a close shot, I'll stick to my traditional ways. Good luck with the call, let us know how it turns out.
Selmer