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The Curious Bag
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<h4 class="dechead">On One Hand: Safe but Ineffective
The ultrasonic pest killers legally sold in the United States are not harmful to humans but are unlikely to solve your pest control problem. The reason for this, according to Washington State University professor Leonard Askham, is that an ultrasonic sound that does not bother humans is not likely to bother an insect or rodent pest, either.
On the Other: Manufacturers Claim Effectiveness
Some makers of ultrasonic pest control devices make strong claims for their products, advertising that they repel insects, eliminate rodents and get rid of fleas. However, the Federal Trade Commission says these claims are unfounded and has sent warning letters to a number of the manufacturers.
Bottom Line
The general consensus of the scientific community is that these products are safe for humans but are a poor method of eliminating pests. More effective means of solving your pest control problems can be found on the Environmental Protection Agency's website.
Source:
Washington State University: Ultrasonic and Subsonic Pest Control Devices
Federal Trade Commision: FTC Warns Manufacturers of Ultrasonic Pest Control Devices
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