At a former museum we used ultrasonic repellers and they really didn't seem to have much of an effect. Granted we did not have a large rodent population but I did still catch a few unfortunate souls in our traps even with the repellers. These repellers were also suppose to work on insects like crickets and I can tell you they defiantly had NO effect on those things. Overall, I would say don't waste your time or money on ultrasonic repellers. But that is just one opinion.
Mandy Langfald
Curator of Collection
Wyoming State Museum
307-777-7033
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