This app was mentioned in 2 comments, with an average of 2.00 upvotes
I wonder if dog whistle ap would work?
https://play.google.com/store/apps/details?id=proffesionals.dog.whistle.cat.repelent&hl=en
https://play.google.com/store/apps/details?id=proffesionals.dog.whistle.cat.repelent&hl=en
thats the app. Don't abuse people with it.