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Seimans(sp) makes a unit that blasts ultrasonic noise.
It's about the size of a pack of cigarettes, black with a rocker switch on top. Mine is foam taped to the top of my batteries. Some people can hear it, some can't. You sure won't hear it over the 75db of a running e450.
Look it up on amazon, pay $12 bucks and don't rely on some of the cedar shavings and other stories.
I did a perfunctory perusal through Amazon and Google and didn't see my model. I didn't look hard enough to tell you if they updated the housing... So... No link
The cedar shavings is particularly disturbing crock of crap because it's exactly what you buy for bedding if you have a pet rodent.
(the reason they eat some wires and not others? Some, not all, have soy based plastic insulation. In my area they seem to focus on those wires.)
That's hot glue on the positive terminal. An experiment.
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