Do Ultrasonic Devices Really Work?

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The PA Department of Agriculture (Penn State University) as of January 2006 still maintains that;

"Mice are somewhat wary animals and can be frightened by unfamilar sounds coming from new locations. However most rodents can quickly become accustomed to these new sounds, especially when they are heard repeatedly.
For years devices that produce ultrasonic sound that is claimed to control rodents has come and gone in the markeplace. There is little evidence to suggest that rodents' responses to non-specific, high frequency sound is any different from their response to sound within the human range of hearing.

What is known about rodents and sound?

Usually loud sounds and novel sounds, including ultrasonic sounds which rodents can hear, will frighten them and may cause temporary avoidance lasting from a few minutes to a few weeks.
Ultrasound has not been shown to drive established rodents out of buildings or areas, nor has it been proven to cause above-normal mortality in their populations. While it is possible to cause convulsions or permanent physiological damage to rodents with ultrasound, the intensity of such sounds must be so great that damage to humans or domestic amimals would be likely. Commercial ultrasound pest control devices do not produce sound of such intensity.

What is known about ultrasound?

It is very directional and does not travel around corners well; thus sound shadows or voids are created.

Ultrasound does not travel very far. It loses intensity rapidly as it leaves the source (ultrasound device).

Recent tests of commercial ultrasound devices have indicated that rodents may be repelled from the immediate area of the ultrasound for a few days, but then return and resume normal activities. Other tests have shown the degree of repellency to depend upon the particular ultrasonic frequencies used, their intensity, and the pre-existing condition of the rodent infestation. It is generally agreed that ultrasonic sound has very limited usefulness in rodent control. The advertising claims for many commercial devices are completely unsubstantiated by scientific research. Since commercial ultrasonic devices are of questionable effectiveness, they cannot be recommened at this time as a solution to rodent control."

RMD Statement

The above statements are not mine (RMD). They are from the PA Department of Agriculture, Penn State University. If there are any disputes with the above information, take it up with the PA Department of Agriculture. If ultrasonic devices work, prove it at Penn State.

And Finally

Folks, if you want to get rid of the mice, taking shortcuts does not work here, or in any endeavor you choose to do.
What you need to do is roll up your sleeves, take a little time and have a little patience. You will be rewarded with a job well done, and self satisfaction to boot.

Thank You

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