They are cheap, silent to most adults and stocked in almost every hardware shop in the UAE. Controlled tests going back to the 1980s have found that they do not control cockroaches, rodents, mosquitoes or bed bugs. Here is what the research and the regulators found, pest by pest, which animals in your home can actually hear them, and what to use instead.
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No. No independent controlled study has shown a commercial ultrasonic repeller clearing an infestation of any pest that UAE households buy them for. University entomologists have tested them against German cockroaches, rats and mice, bed bugs, fleas, ants and mosquitoes, and the results range from no effect at all to a brief startle that fades within days.
The University of Arizona Cooperative Extension reviewed this research in its handout Sonic Pest Repellents (AZ1639, revised 2015) and advised against using the devices for common pest problems because they have not been shown to work in scientific studies. Cornell University's NYS IPM programme summarised the same body of work in 2016: scientific evaluations found no effect on German cockroaches, bed bugs or rodents.
The Arizona handout does note that researchers are developing acoustic methods with promise for a few very specific pests. None of that work is what is sold in a plug-in box.
An ultrasonic repeller is a small speaker that plays sound above the range of adult human hearing, roughly anything over 20 kHz. The pitch on the box is that the noise is unbearable to insects and rodents, so they leave. When Kansas State University researchers measured three commercial units in 2006, the output peaked between about 26 and 42 kHz at 88 to 95 decibels. Many models sweep or randomise the frequency, which is presented as the answer to pests getting used to a single tone.
The physics works against the product before biology comes into it. High-frequency sound behaves more like a torch beam than a ceiling light:
Now think about where pests actually live in a Dubai home: cockroaches inside cabinet hinges and the fridge motor housing, rats in false ceilings and service ducts, bed bugs in mattress seams, ants in wall voids. Every one of those places is behind something solid, so a unit in an open wall socket is broadcasting into the one part of the room the pests were never in. Cornell's review adds another problem: when devices were checked independently, some did not produce the frequency or loudness printed on the packaging.
The research points the same way for every household pest it covers. Here it is in brief, followed by the detail for the pests that matter in UAE homes.
| Pest | Key evidence | Result | What works instead |
|---|---|---|---|
| German cockroach | University of Florida and USDA, 1986 (9 devices, field test in apartments); Kansas State, 2006 (3 devices) | No repellency, no significant fall in populations | Gel bait in harbourage, monitor traps, sealing pipe gaps |
| Rats and mice | USDA review, 1995 (6 devices) | Marginal effect that was gone within 3 to 7 days | Proofing entry points, snap traps, locked bait stations |
| Mosquitoes | Cochrane review, 2007 (10 field studies) | No difference in mosquitoes landing on skin | Removing standing water, screens, skin repellent |
| Bed bugs | Northern Arizona University, 2012 (4 devices) | Neither repelled nor attracted | Professional treatment |
| Fleas | University of Florida and USDA, 1986 | Completed their whole life cycle beside running devices | Vet treatment for the pet, vacuuming, an insect growth regulator |
| Ants | Kansas State, 2002 (3 devices, 3 species) | No repellency in field or laboratory | Bait placed on the trail |
| House geckos | Lizard hearing research | Hear roughly 0.1 to 5 kHz, so ultrasound is silent to them | Fewer insects, sealed gaps, yellow outdoor bulbs |
| Pigeons | Bird hearing research | Bird hearing ends far below ultrasound | Netting, spikes, bird wire |
The cockroach evidence is the most consistent. In 1986 a University of Florida and US Department of Agriculture team (Koehler, Patterson and Webb, Journal of Economic Entomology) tested nine commercial units. All of them produced ultrasound, and German cockroaches walked into treated rooms as readily as untreated ones. In occupied apartments, populations were not significantly reduced. Kansas State's 2006 study of three further devices found none repelled German cockroaches well enough to be useful. This is the species in almost every Dubai kitchen, and it lives precisely where sound cannot follow. What does work on it is covered in our guide to cockroach treatment in Dubai.
Rodents can hear ultrasound, which is why the idea looked promising in the first place. The problem is habituation. A 1995 review from the USDA's Denver Wildlife Research Center found that controlled tests of six commercial ultrasonic devices produced only a marginal effect, a 30 to 50 per cent drop in movement activity, and no significant repellency after 3 to 7 days of exposure. The University of California IPM pest note on rats puts it plainly: rats are wary of unfamiliar noises but quickly become accustomed to repeated sounds, which makes high-frequency and ultrasonic devices ineffective in homes and gardens.
The one glimmer is narrow: the Internet Center for Wildlife Damage Management notes a 2011 finding that ultrasound showed some ability to keep mice and bats out of open, empty space such as bare floor or open rafters. A furnished flat full of cupboards and ceiling voids is the opposite of that test, which is why getting rid of rats in Dubai comes down to finding and closing the way in.
Mosquito devices have the clearest verdict, because they have been reviewed systematically. A Cochrane review by Enayati, Hemingway and Garner (2007) assessed 10 field studies of electronic mosquito repellents. All 10 found no difference in the number of mosquitoes landing on bare skin with or without a device, and the authors concluded that the devices have no effect on preventing bites and that there is no justification for marketing them against malaria. In the UAE, the daytime-biting Aedes mosquito breeds in AC drip trays, plant saucers and blocked balcony drains, and a box humming on the balcony does nothing about the water producing tomorrow's adults. These findings are about sound devices; the plug-in vaporisers that release an insecticide into the room are a different product. Our guide to getting rid of mosquitoes in Dubai shows where to look.
Northern Arizona University researchers Yturralde and Hofstetter bought four ultrasonic devices online, ran them as the instructions directed and released bed bugs into a two-chamber test (Journal of Economic Entomology, 2012). The bugs were neither driven away from the sound nor drawn to it, and the authors concluded that ultrasound is not a promising tool for repelling bed bugs. Fleas did no better in the 1986 Florida study: oriental rat fleas mated, laid eggs and developed all the way to pupae in rooms with the devices running.
Kansas State also tested three devices against three ant species. As summarised in the University of Arizona review, none repelled ants in the field or the laboratory, and the single brief effect seen in the laboratory soon faded. Crickets produced the only partial positive: in a laboratory enclosure, two commercial units and the university's own random-frequency generator partly repelled house crickets, but in greenhouse trials the devices made no difference to field crickets. That is the best result the category has, and crickets are not why anyone in Dubai buys one.
For these two the problem is simpler: they cannot hear it. Research on lizard hearing puts the usable range at roughly 0.1 to 5 kHz, and work on the gecko ear shows its middle ear transmits sound poorly above about 4 kHz. Birds stop short of ultrasound too. Published measurements for budgerigars, canaries and chickens end at around 7 to 8 kHz, and owls at about 12 kHz. Pigeons are known for unusually sensitive low-frequency hearing, not high. A unit working at 25 kHz or more is silent to the gecko on your ceiling and the pigeon on your railing. Geckos follow the insects they eat, and pigeons respond to physical exclusion, which is why pigeon control on Dubai balconies means netting and spikes rather than sound.
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Advertising regulators have looked at these products several times, and the pattern does not change: they ask sellers for evidence, and sellers cannot produce it.
The 1995 USDA review also noted that, unlike pesticides, these gadgets needed no registration with the US Environmental Protection Agency. So, unlike a can of spray, the device never had to show that it worked before it reached the shelf.
Glowing reviews and decades of failed trials can both be true, because a review records what happened after a purchase, not what the device caused.
Frequency sweeping, the usual answer to habituation, has not rescued the results either. Kansas State's own random-frequency generator still made no difference to field crickets in the greenhouse trials.
The animals most likely to be bothered by an ultrasonic repeller are the pets sharing the flat, not the pests. Veterinary hearing data from the Louisiana State University School of Veterinary Medicine shows who can hear what. The ranges are approximate and the studies behind them used different methods, but the pattern is clear.
| Animal | Approximate hearing range | Can it hear a 26 to 42 kHz unit? |
|---|---|---|
| Human | 64 Hz to 23 kHz | No |
| Dog | 67 Hz to 45 kHz | Yes |
| Cat | 45 Hz to 64 kHz | Yes |
| Rabbit | 360 Hz to 42 kHz | Yes |
| Guinea pig | 54 Hz to 50 kHz | Yes |
| Rat | 200 Hz to 76 kHz | Yes |
| Mouse | 1 kHz to 91 kHz | Yes |
| Gerbil | 100 Hz to 60 kHz | Yes |
| Ferret | 16 Hz to 44 kHz | Yes |
| Canary, cockatiel, parakeet | Up to about 8 to 8.5 kHz | No |
| Goldfish | Up to about 3 kHz | No |
Rabbits, guinea pigs and pet rats, mice and gerbils are the ones genuinely at risk. They hear the whole output band, their cages usually sit at floor level near the sockets, and they cannot leave the room. Hamsters are not on the LSU table, but every rodent on it hears above 20 kHz. If the box worked on wild rodents as advertised, it would work on the one in the cage. We found no published study measuring harm to pets from these devices, so this is precaution rather than proof: never run one in a room with a caged small mammal.
Dogs and cats can hear the output but can walk away from it. If a pet suddenly avoids a room, paces, or keeps flicking its ears near a socket, unplug the unit. Birds, fish and reptiles cannot hear ultrasound. For the precautions that matter during a real treatment, see our guide to pest control and pet safety.
People. Most adults hear nothing, though younger people can sometimes catch a faint whine from units working near 20 kHz. Cornell's review also notes that some devices have measured louder than US occupational noise limits allow.
Electromagnetic repellers claim to send a pulse through the home's electrical wiring that drives rodents and cockroaches out of wall cavities. Global Instruments advertised exactly this for its Pest-A-Cator range, promising to clear mice, rats and cockroaches within two to four weeks, and in 2003 agreed to an FTC order barring it from making efficacy claims for any pest device without scientific substantiation. A 2003 review for the Wildlife Damage Management Conference by Robert Timm of the University of California concluded that laboratory and field tests of electromagnetic, sonic and ultrasonic rodent devices had generally failed to show they work. A combination unit that pairs ultrasound with an electromagnetic mode is two unproven methods in one plastic case.
Anti-mosquito phone apps claim to play a tone, often described as dragonfly wingbeats or simply ultrasound, that keeps biting mosquitoes away. Phone speakers are designed mainly for the frequencies people hear, and the idea is the same one the Cochrane review tested and found no effect for across 10 field studies. The app the ASA ruled against in 2015 claimed that up to 80 per cent of users stayed bite free; the claim could not be supported.
Every pest these boxes are sold for has a method with real evidence behind it, and nearly all of them start with finding where the pest lives.
If you would rather spend your money on something from the shelf than on a gadget, our guide to pest control sprays in the UAE covers which products are worth buying and how to use them safely.
Most repeller packaging relies on the same handful of claims, and each one can be checked against what is known.
A useful rule: be sceptical of any product that claims to clear an infestation without anyone finding where the pests live. Every method with evidence behind it, from gel bait to proofing to larvicide, works by reaching the harbourage.
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