Fly Lure

It sticks the strips to the window, I have it inside the frame part behind the curtain or curtain. It can hardly be seen. The flies remain not off sticking, but then lie down on the window or on the ground. The one must then collect. But it works, so it seems to be highly effective. Of course in the room anyway which fly around, but not many, and the need to later "to believe it." Other insects do not seem to go off, which of course is good. My only concern would be our cat who sometimes like a fly isst- whether harms that ?!