They have a version of these in Australia that are used to 'protect' against kangaroos.
"ShuRoo creates a high frequency "Safety Sound Zone" 400 metres ahead and 50 metres either side of your vehicle which alerts kangaroos and other wildlife of your approaching vehicle—day, night, rain or shine.
ShuRoo's unique signal cannot he heard hy humans, but to wildlife It Is as loud as a police siren. By taking advantage of their high frequency danger alert system in this way, ShuRoo warns animals of your approach and helps prevent a collision that could potentially harm you, your passengers and your vehicle. Not only does ShuRoo help protect you and your family, It also protects our wildlife."
The general concensus is that they are Snake oil that's supported solely by the punters' 'testmonials', in
the complete absence of any relevant scientific evidence whatsoever.
LAroo