Originally Posted by
ugu80
Once read some stuff on Shoo Roo and the Doppler effect. The conclusion was that, even if they did work, they would be not be effective once you went over 80 km/h. I had a work car with them fitted and didn't notice any difference to roo behaviour, even when I stopped near a mob pointed it at them and turned it on, but I once stopped near a paddock with some horses. I turned the Shoo Roo on and the effect was immediate. It attracted the horses to the car. Maybe it should have been called 'Come Horsie'.