Do ultrasonic pest repellents work?

I’ve heard mixed reviews, and I’m confused. Do ultrasonic pest repellers work? 

Ultrasonic pest repellents are small plug-in devices that claim to drive away rodents, cockroaches, and other pests by emitting high-frequency sound waves. These devices can deter pests initially, but they rarely work as a long-term solution. 

Research shows pests quickly adapt to the noise, making the devices ineffective over time. They also don’t reach hidden nesting areas or address food and water sources, which is why infestations develop in the first place. So the short answer is no—ultrasonic pest control isn’t a reliable solution.

Are ultrasonic pest repellers safe?

Most ultrasonic pest control devices are safe for people and pets since the sound is outside the human hearing range. They are generally safe for common pets like cats and dogs, as the high-frequency sound waves typically operate outside of their primary hearing range.

Caution is necessary for pet rodents such as hamsters, guinea pigs, rats, and mice. These animals have significantly more sensitive hearing and may experience distress or discomfort from the device's emissions.

Limited research exists on the long-term effects on any pet. If you have concerns, you should consult your veterinarian before use.

Some outdoor models marketed as ultrasonic animal repellers may startle wildlife temporarily, but results are inconsistent and easily disrupted by weather or distance. When it comes to ultrasonic pest devices, safety is rarely the issue; effectiveness is.

What works better than ultrasonic pest control?

Because ultrasonic devices don’t provide dependable results, the best way to get rid of pests is to combine prevention and professional treatment. Sealing entry points, reducing food and moisture sources, and using targeted treatments are all more effective ways to prevent an infestation.