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My rats, native rats, are smart enough to know which is power, and which is ground, on the ultrasonic transmitters.
They have, twice now, chewed only the power wire in two. Maybe the red wire tastes nice.
Once, the little bastard chewed it twice and took out a 4" section I never found.
And
Some guests in my shop could hear the ultrasonic...they said it was nastily irritating.
And
They run down a battery in a a couple of weeks.
I have five here. They are made by Siemens.
We only drive one vehicle frequently enough to keep one of these in it.
I unhooked the others due to dead batteries.
They work well enough, but the down side is really a downside.
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