I don't think they work nearly as good as they did 10 years ago. We had one of the first Robo Ducks (in fact I think thats what it was called) and that damn thing could bring a duck from well over a mile on a bright sunny day. Now, we have to have remotes to cut them off....motion on the water.....three or four instead of just one....its made the ducks MUCH more wary.