No. Across four decades of controlled testing, ultrasonic repellers have failed against every pest they're marketed for — cockroaches, mice, rats, ants, bed bugs, and mosquitoes. The University of Arizona's extension review of the scientific literature is unambiguous: the devices "have not been shown to be effective in scientific studies" and their use "is not advised."
We're a pest control company, so you'd expect us to say that. Which is why this article doesn't ask you to take our word for anything — every claim below links to university testing, a Cochrane review, or a federal enforcement action.
The Evidence, Pest by Pest
| Pest | What controlled testing found |
|---|---|
| Cockroaches | Nine commercial devices tested (Koehler et al., 1986): equal numbers of roaches entered rooms with the sound on and off |
| Bed bugs | Four commercial devices (Yturralde & Hofstetter, 2012, J. Econ. Entomol.): bugs settled in roughly equal numbers on the device side and the control side |
| Ants | Three devices vs. three ant species (Huang et al., 2002, Kansas State): none repelled ants in lab or field; one worked briefly before losing effect |
| Mice & rats | Mild aversion that faded — rodents fed next to a running device once food was available (Greaves & Rowe, 1969); UC IPM: "little evidence" any sound device drives out established rodents |
| Mosquitoes | Cochrane review of 10 field studies: no difference in landings with or without devices; one study measured bite rates increasing up to 50% with devices on |
The mosquito line deserves a second look, because it flips the usual assumption that a plug-in "can't hurt." The Cochrane review — medicine's most conservative evidence standard — concluded electronic mosquito repellents have "no effect on preventing mosquito bites" and that "there is no justification for marketing them." A separate controlled study (Andrade & Cabrini, 2010, J. Vector Ecology, cited in the University of Arizona's extension review) measured Aedes aegypti bite rates rising by as much as 50% with sonic devices switched on. The CDC's position, quoted in a federal complaint: ultrasonic products "are not effective at preventing mosquito bites."
Why the Physics Was Never Going to Work
Two problems sink these devices, and neither is fixable with a better model.
Ultrasound stops at the first obstacle. High-frequency sound is directional and weak — UC IPM's house mouse guidance notes ultrasonic sounds "are directional and don't penetrate behind objects," and they fade fast with distance. Your mouse lives behind objects: inside the wall void, under the range, behind the couch. The device fills the open middle of the room — the one place the mouse never goes — with sound, and leaves every actual harborage in a quiet shadow.
Pests stop noticing. Habituation is the killer. UC IPM again: mice "are easily frightened by strange or unfamiliar noises," but "quickly become accustomed to regularly repeated sounds." In the classic rodent study, the mild aversion faded — especially once the animals found food near the device. A repeller plugged in next to your pantry is a novelty for a few nights and furniture after that. NC State Extension's verdict covers the insect side: scientific tests "do not indicate that they repel or reduce the attack of biting insects, ticks, or mites, nor do they eliminate cockroach infestations."
The FTC Has Been Chasing These Claims Since the 1980s
This isn't just an academic dispute — it's an enforcement record. In 2001 the Federal Trade Commission sent warning letters to more than 60 manufacturers and retailers of ultrasonic devices, demanding scientific substantiation for their claims, after bringing enforcement actions against six companies between 1985 and 1997. The FTC's own complaints stated that any rodent reaction to ultrasound "would be temporary at best because rodents become accustomed to ultrasound."
It didn't stop there. In 2002 the agency charged Lentek International over its PestContro and MosquitoContro devices, and in 2003 the maker of the QVC-famous Riddex plug-ins settled with the FTC over unsubstantiated claims that the devices "repel mice, rats, and cockroaches in two to four weeks" and "eliminate the need for exterminators." Two decades later, near-identical wording still fills online listings — the claims outlived the consent orders.
The Real Cost Isn't the $30 — It's the Delay
Here's the part that matters for your house. A plug-in repeller doesn't just fail quietly; it buys the infestation time. Mice reach breeding age in about six weeks. Roaches lay egg cases on a schedule that doesn't care about sound. Every week spent believing the little blue LED is working is a week the population compounds — and rodents kept feeding right beside a running unit in testing. The device's real product is false reassurance.
What extension entomologists verify instead is unglamorous and effective:
- Exclusion — seal gaps at doors, pipes, and foundations; a mouse needs about a dime-sized hole.
- Sanitation — remove the food and moisture that made your home worth invading (Utah State Extension's rodent guidance: there is "no scientific evidence" the plug-ins work, so spend the effort here).
- Traps and targeted baits — snap traps for rodents, gel and granular baits for insects, placed where pests actually travel.
- Professional treatment for established populations — because by the time you're shopping for gadgets, there's usually a harborage to find and fix.
If you've been running ultrasonic units while a pest problem grew, you're exactly who our DIY pest control guide was written for — and if the problem is past DIY, that's what we're here for.
Key Takeaways
- No controlled study has shown ultrasonic repellers work — against roaches, bed bugs, ants, rodents, or mosquitoes.
- Two unfixable problems: ultrasound can't reach inside walls and shadows, and pests habituate to repeated sound.
- Sonic mosquito devices measurably increased bite rates in testing — up to 50%.
- The FTC has warned 60+ sellers and forced consent orders over these exact claims since the 1980s.
- The real cost is the delay: exclusion, sanitation, traps, and targeted treatment are what the evidence supports.
Frequently Asked Questions
No. The University of Arizona's extension review of the scientific literature concluded that commercially available sonic pest devices have not been shown to be effective in scientific studies and their use is not advised. Controlled tests found no effect on cockroaches, bed bugs, ants, mice, or mosquitoes.
Habituation. Rodents startle at unfamiliar sounds but, per University of California IPM guidance, quickly become accustomed to regularly repeated ones. In testing, mice showed mild aversion that faded, and they fed happily next to a running device once food was available. Any effect is temporary; the infestation continues growing.
Yes. The FTC sent warning letters to more than 60 manufacturers and retailers in 2001 demanding scientific substantiation, brought enforcement actions against six companies between 1985 and 1997, and later charged the makers of well-known plug-in devices over claims that they repel mice, rats, and roaches or eliminate the need for exterminators.
No — this is the best-studied case. A Cochrane review covering ten field studies found no difference in mosquito landings with or without the devices and concluded there is no justification for marketing them. One controlled study found bite rates actually increased by as much as 50 percent with sonic devices switched on, and the CDC states ultrasonic products are not effective at preventing mosquito bites.
What extension entomologists actually verify: seal entry points, remove food and moisture, use snap traps for rodents and targeted baits for insects, and bring in a professional for established infestations. The money spent on plug-ins buys a delay while the pest population grows — not protection.
Sources: University of Arizona Extension, Sonic Pest Repellents (AZ1639) (incl. Koehler et al. 1986; Yturralde & Hofstetter 2012; Huang et al. 2002; Greaves & Rowe 1969; Andrade & Cabrini 2010); UC IPM, Pest Notes: House Mouse; NC State Extension, Insect Repellent Products; Utah State University Extension, How to Rid Your House of Rodents; Cochrane Review CD005434, Electronic Mosquito Repellents; FTC press releases: May 2001 warning letters, Aug 2002 (Lentek), July 2003 (Global Instruments / Riddex).