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Home / Rodent Guide / Do Ultrasonic Rodent Repellers Work? What the Evidence Says
Plug-in ultrasonic repellers promise a quiet, chemical-free way to drive rats and mice out of a home. They are easy to buy and easy to use. The question is whether they actually solve a rodent problem.
By Spring Hill Rodent Pros \u{00B7} Updated November 11, 2026 \u{00B7} 4 min read
The evidence says ultrasonic repellers are not a reliable way to get rid of rats or mice. The Federal Trade Commission has warned manufacturers that effectiveness claims must be backed by science, and noted that any reaction by rodents is likely temporary because they get used to the sound. The sound also does not pass through walls or furniture. Sealing entry points and trapping are what actually work.
These devices plug into an outlet and emit high-pitched sound above the range of human hearing. Rats and mice can hear these frequencies, so the idea is that the noise is irritating enough to make them leave and stay away. Some models switch frequencies or add flashing lights or electromagnetic features, claiming that this prevents rodents from getting used to them.
In 2001, the Federal Trade Commission sent warning letters to more than 60 manufacturers and retailers of ultrasonic pest-control devices, telling them their efficacy claims needed competent scientific support. The FTC had already brought cases against several companies over unsupported claims, and noted that rodents’ reaction to ultrasound would be temporary at best because they become accustomed to it and return to feeding and nesting areas.
Independent testing has generally found weak or short-lived effects. Ultrasonic sound is easily blocked: it does not travel through walls, cabinets, insulation or furniture, so even a strong device only covers open space in a single room. Rodents that have food and shelter inside a wall or attic have little reason to leave.
Lasting rodent control follows the same steps every time: find out how rodents are getting in, remove the ones inside, close the entry points with materials they cannot chew through and remove the food and shelter that attract them. In Spring Hill, that usually means sealing rooflines, soffits, vents and utility gaps, trimming trees away from the roof and trapping in the attic or garage.
Learn more about rodent trapping and prevention, rodent exclusion, or our pet-safe rodent control options if you were hoping to avoid chemicals.
They are not a reliable solution. Rats may react at first, but the FTC has noted rodents get used to the sound, and ultrasound does not pass through walls or insulation where rats nest.
Dogs and cats generally hear some ultrasonic frequencies, and pet rodents such as hamsters, guinea pigs and pet rats are especially sensitive. Check the product label and avoid using them around small pets.
Seal the gaps they use to get in, remove food and clutter, and use traps placed where children and pets cannot reach them. This approach works without poison in most homes.
Call and tell us where you are and what you are hearing, seeing or smelling. A local rodent specialist can then set up an inspection of your attic, crawl space, garage and exterior.