I have used these for many years, just needed some more to replace and add. They create a fly free zone in the horse stall, around the back door (even though it is outside, it helps).
Had purchased one previously so was satisfied with it and was looking to get more they seem to work well
So far it has been working very well it has cut down the flies that hang around the back door I bought 2 one for the font as well
Between using this product an the misquote hault my mare is finally at peace in her stall since she is on stall rest currently
It proved to work great! Where I live I have a huge fly problem. This product worked great!