On Countryfile on the BBC today, there was a guy with a cat scarer, which looked like a small torch. You point this at the cat, or whatever presumably, to chase it away by pressing the button, it works with ultrasonic frequencies. I have searched for this with no success; but there are plenty of PIR operated units available. Anyone have any knowledge of a source?
The Countryfile programme was partly about the declining birdlife, partly blamed on feral cats and grey squirrels.
Jaymack