Discrete Alarm to Deter Animals

[Arjun]

Is there a discrete alarm available to deter animals (i.e. Raccoons, Cats, Squirrels)? Perhaps a Z-Wave device would do, but it would need to be secured against a wall and be waterproof. Any suggestions would be greatly appreciated. I'd like something which can be manually triggered on and off, because coincidentally these animals are always in-sight

 

[looney2ns]

https://www.amazon.com/Scarecrow-Motion-Activated-Animal-Repellent/dp/B000071NUS/ref=sr_1_4?s=electronics&ie=UTF8&qid=1535823780&sr=1-4&keywords=pest+repeller+outdoor

 

[mark_whocares]

no manual trigger but i have one of these in my back yard.
https://www.amazon.com/gp/product/B07CHX4BR9/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

I can hear it going sometimes, but I have ears that apparently pick up high freq stuff well. of the others I have asked they can't hear it.


note: if you have a dog/cat of your own this might not be a good idea.