Ultrasonic Animal Chaser. Does it work for Cat and Racoon?

[insx]

I saw this at Florida store web site. http://www.securityworld.com/homeapt/92081.html

Have anyone of you use this kind of thing?
Does it work?
I have 3 racoon and cat walking around my garden opening trash and leaving dead fish or their shit around the garden.

Thanks

 

[nsxtasy]

I don't know if it works, but a better solution is to see if your local animal shelter loans out humane traps, so you can catch the animals; mine does, for free (a deposit that is returned when the trap is returned).