Since we have used the device before the Cats defense should it now the raccoon on our roof terrace I vertreiben.Als heard him the Dachrinnrauf is I waited a moment, then he is likely to come into the detection range of the device, and lo and behold, very rapid retreat .From my view a complete success, although I have nothing against these animals habe.Aber I think it's a good way to keep away the animal without him hurt.