I bought two animal repellers with a range of 600 meter. I am in Australia. I tried them on Kaenguruhs as close as 5 meter, flying foxes as close as 10 meters, cats dogs and parrots. No animal showed any reaction whatsoever. Our dog was sitting right next to me when I put the batteries in - diode was blinking ---no reaction at all - holding the speaker to the ear. I think this is a big bluff - put it up and see a blinking light and hope it does something-well --it does not! read more