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You Asked:
Do home ultrasonic pest repeller outlet plug-ins really work? — Hebert, Brooklyn, N.Y.
Marshall Brain Answers:
In a word, No. Ultrasonic pest repellers do nothing. Which is amazing since you see these things being sold everywhere. They are supposed to eliminate roaches, spiders, mosquitoes, mice, rats, etc. Here is a typical ad:
The Federal Trade Commission has declared the devices useless:
Here is another article debunking these devices:
Do ultrasonic bug repellers work?
It would be great if they did work. Everyone would like to have a simple, carefree device that would eliminate spiders from the garage and roaches from the kitchen. But such a device does not currently exist.
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