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We hope, however, that you will find this information helpful in making more informed and responsible wildlife damage management decisions.

Ultrasound

Definition: According to Wikipidia, ultrasound is a form of cyclic sound pressure with a frequency greater than the upper limit of human hearing, this limit being approximately 20 kilohertz (20,000 hertz).

Varieties

Here is one product that claims to have three different sound levels and can even be motion activated

http://www.sales-services.co.uk/html/ultrasonic_animal_chaser.html

Not as effective as you might think--Even Animal Rights Groups don't recommend ultrasonic devices. See the HSUS's Wild Neighbors book.

Additional Information on Ultrasound's Ineffectiveness

Here are several references that show that ultrasound devices are not effective
in controlling rodents.

• Ultrasonic and Subsonic Devices  Washington State University.
• Sprock, C.M., W.E. Howard, and F.C Jacob. 1967. Sound as a deterrent to rats and mice. J. Wildl. Manage. 33194)724-736.
• Howard, W.E., and R.E. Marsh. 1982. Ultrasonics and electromagnetic control of rodents. Third Intern. Theriological Congress, 15-20 August 1982, Helsinki, abstract.
• Howard, W.E., and R.E. Marsh.1985. Ultrasonics and electromagnetic control of rodents. Acta Zool. Fennica 173:187-189. EPA funded our electromagnetic study and we worked with EPA to help the Federal Trade Commission try to ban ultrasonics. I think we demonstrated that the success of a rodent control program with ultrasonics was just as successful if the units were not turned on.