PLUG IN Pest Free®
Electromagnetic Technology
vs
Ultrasonic Pest Repellers

Not all electronic pest control technologies are created equal. Discover why PLUG IN Pest Free has been trusted by millions worldwide for more than 30 years.

PLUG IN Pest Free utilizes patented electromagnetic technology that works through a building’s existing electrical wiring system to help create an environment that rodents and pests find less desirable.

Unlike ultrasonic pest repellers, which rely on high-frequency sound waves, PLUG IN Pest Free is designed to work through the electrical wiring network of a structure. Ultrasonic sound waves are inherently limited by line-of-sight transmission and can be obstructed by walls, furniture, cabinetry, insulation, stored goods, and other physical barriers. As a result, ultrasonic devices are generally limited to the immediate area in which they are installed and often require multiple units throughout a property in an attempt to achieve broader coverage.

While ultrasonic products are frequently marketed as a low-cost solution, many consumers become frustrated by inconsistent results and the need for multiple devices. By comparison, PLUG IN Pest Free utilizes a completely different approach that operates through the structure’s existing electrical wiring system rather than relying on sound waves.

PLUG IN Pest Free is safe for use around most common household pets, including cats, dogs, birds, and fish. However, pet rats, mice, hamsters, gerbils, and other closely related rodents should be housed away from electrical wiring while the system is operating.

Pest Free is also safe to use alongside common household appliances and electronics, including televisions, radios, computers, gaming consoles, kitchen appliances, Wi-Fi systems, alarm systems, and medical devices such as pacemakers.

Consumers should also be cautious of gimmick combination devices marketed as ultrasonic and electromagnetic solutions. Many of these products combine ultrasonic speakers, LED nightlights, USB charging ports, and broad electromagnetic claims into a single device that appears impressive on the packaging.

While these products may offer multiple features, our testing and industry observations have shown that many rely primarily on ultrasonic technology while providing limited or no evidence of meaningful electromagnetic performance throughout a structure’s wiring system. More features do not necessarily translate into better pest control performance.

Consumers should also be aware that some manufacturers reference scientific studies or testing to support marketing claims, even though their specific products were never evaluated in those studies. Scientific testing conducted on one technology or product should not be assumed to validate another product that may use different designs, operating principles, or combinations of technologies.

Since 1998, PLUG IN Pest Free has been supported by blinded scientific testing conducted by the University of New England (UNE) on its own patented electromagnetic technology. Unlike generalized scientific references often used throughout the industry, the University testing was conducted specifically on PLUG IN Pest Free technology. Trusted worldwide for more than 30 years, PLUG IN Pest Free remains the trusted benchmark in electromagnetic pest control technology.

PLUG IN Pest Free® Electromagnetic Technology

Patented. University-Tested. Trusted Worldwide for More Than 30 Years.

 

Numerous products on the market claim to utilize electromagnetic technology. However, testing of many competing devices has demonstrated limited or no measurable effectiveness, and many manufacturers provide little to no product-specific scientific validation to support their claims.

PLUG IN Pest Free utilizes patented electromagnetic technology that works through a building’s existing electrical wiring system. By generating carefully controlled electromagnetic pulses throughout the wiring network, Pest Free helps create an environment that rodents and pests find less desirable.

Unlike many competing products, PLUG IN Pest Free has been supported by blinded scientific testing conducted by the University of New England (UNE) on its own patented technology. Since 1998, this testing has helped establish Pest Free as the trusted benchmark in electromagnetic pest control technology.

✓ Utilizes a building’s existing electrical wiring system to help provide coverage throughout the structure.
✓ Targets areas where rodents, cockroaches, and other pests commonly nest, breed, and seek shelter.
✓ Helps reach areas that are often difficult to treat with conventional pesticides, including wall cavities, cupboards, drawers, roof spaces, and other concealed locations.
✓ Available in models designed to accommodate a wide range of residential and commercial property sizes.
✓ Completely pesticide-free with no ongoing need for toxic sprays, hazardous poisons, traps, or baits.
✓ Safe for use around most common household pets, including cats, dogs, birds, and fish.
✓ Safe for use alongside televisions, computers, gaming consoles, Wi-Fi systems, alarm systems, kitchen appliances, and medical devices such as pacemakers.
✓ Supported by analytical testing, blinded university scientific testing, and more than 30 years of documented real-world use worldwide.

Ultrasonic Pest Repellers

Limited by Line-of-Sight Coverage and Physical Obstructions

 

Ultrasonic pest repellers operate by emitting high-frequency sound waves into the immediate area surrounding the device. Unlike electromagnetic technology, ultrasonic sound waves do not travel through a building’s electrical wiring system and are generally limited to the room in which the device is installed.

Walls, cupboards, drawers, wardrobes, furniture, appliances, stored goods, and other physical barriers can obstruct ultrasonic sound waves, creating areas where rodents and pests may continue to nest, breed, and seek shelter without being directly exposed to the device.

As a result, many ultrasonic manufacturers recommend installing multiple units throughout a property, often requiring separate devices for individual rooms and additional units in roof spaces, basements, garages, and other areas where pests may be active.

For example, an ultrasonic device operating in a room may have little to no effect on a mouse nesting behind a closed cupboard, inside a wall cavity, beneath a refrigerator, or in another concealed location outside the device’s direct line of sight.

While ultrasonic devices continue to be marketed as a convenient pest control solution, consumers should understand their inherent coverage limitations and the practical challenges associated with relying solely on sound-wave technology for whole-structure pest management.

Common Ultrasonic Marketing Claims

Broad Coverage Claims Without Product-Specific Scientific Validation

 

Many ultrasonic pest repeller companies claim that a single device can provide effective coverage across thousands of square feet within a home or business. In practice, those claims are often based on ideal open-space conditions and may not reflect real-world properties with walls, closed doors, furniture, cabinetry, appliances, insulation, stored goods, and other common obstructions.

Many ultrasonic products also claim to repel a wide range of rodents and insects, yet provide little to no product-specific scientific evidence demonstrating that the actual device being sold has been formally tested for efficacy.

By contrast, PLUG IN Pest Free is supported by blinded scientific testing conducted by the University of New England (UNE) on its own patented electromagnetic technology and has been trusted by customers worldwide for more than 30 years.

CONCLUSION

PLUG IN Pest Free® utilizes patented electromagnetic technology designed to work through a building’s existing electrical wiring system, helping create an environment that rodents and pests find less desirable throughout the structure.

Supported by blinded scientific testing conducted by the University of New England (UNE) on its own patented technology and trusted by customers worldwide for more than 30 years, PLUG IN Pest Free remains the trusted benchmark in electromagnetic pest control technology.

By contrast, ultrasonic pest repellers rely on line-of-sight sound waves that may be limited by walls, cupboards, furniture, appliances, and other physical obstructions. As a result, pests may continue to nest, breed, and seek shelter in concealed areas beyond the effective reach of the device.

When comparing electromagnetic technology to ultrasonic pest repellers, consumers should consider not only marketing claims, but also product-specific scientific validation, real-world performance, and long-term customer trust.