Rat repeller

What is a rat repeller and how does it work?
A rat repeller is an electronic device that emits high-frequency sound waves – known as ultrasound – to make the environment unpleasant for rats and mice. The sound is above the human hearing range (approximately 20 kHz) and is inaudible to us. Rodents, however, perceive the sound and experience it as disturbing, causing them to avoid the area where the repeller is placed.

The term rat repeller is often used interchangeably with mouse repeller, rodent repeller and ultrasonic repeller. The basic principle is the same: to scare away rats using sound instead of poison, traps or chemicals. This makes a mouse and rat repeller a safe option for those who want to combat rats without poison – especially if you have children or pets.

How to choose the right rat repeller
Not all rat repellers are equally effective. Here are the most important factors to keep in mind when choosing a model.

Varied frequencies and sound patterns. A rat repeller that alternates between different frequencies provides better protection over time, as the rodents do not have time to get used to it. Models with bioacoustic signals – such as Repello – also activate the rat's flight instinct at a deeper level than pure ultrasonic interference.

Sound intensity and range. Larger spaces require more powerful units. Repello covers up to 40 m² per unit thanks to its amplifying sound chamber. By comparison, many cheaper models use simple piezo speakers with significantly lower output.

Coverage: one unit per room. Ultrasound cannot penetrate walls, floors or ceilings. Therefore, each space that needs to be protected requires its own unit. Make sure doorways are open so the sound can spread to adjacent rooms.

Placement. Insert the rat repeller into a wall socket near the floor, where rodents normally move. Avoid placing it behind furniture, carpets or curtains – soft materials absorb ultrasound and reduce the effect.

Power source and environment. Most rat repellers, including Repello, connect to a standard wall socket and use very little power (Repello uses only 2.8 W). For spaces without electricity, battery-powered models are also available on the market.

Pets. Ultrasound against rats does not affect dogs and cats. Repello's technology has been confirmed safe for these animals – independent field testing showed no negative effects on other animals in the surrounding area. However, you should avoid using a rat repeller in the same room as domestic rodents – hamsters, guinea pigs and rabbits have similar hearing and may be affected.

Rat repeller for the home, garage and storage room
Repello's rat repeller is designed for indoor use and in sheltered spaces. This means it works excellently in all types of buildings where rodents can gain entry – from houses and townhouses to garages, storage rooms, barns, stables and warehouse spaces. Indoors, the sound waves bounce off walls and ceilings, creating a powerful sound field throughout the entire room.

For those who have problems with rats outdoors – for example under the deck, near the bins or in the garden – the most effective approach is to place the rat repeller in the spaces where the rodents actually enter and reside. By protecting garages, crawl spaces, basements and storage rooms, you keep rats out where it matters.

What makes a rat repeller effective?
An effective rat repeller is built on a simple insight: rats and mice communicate with each other through sounds in the ultrasonic range. They use high-frequency sounds to warn of dangers, stay in contact with young ones and signal stress. By speaking the rodents' own language, a rat repeller can create an environment that they instinctively want to leave.

What determines the result is the type of signal used. A rat repeller that alternates between multiple frequencies and imitates the rodents' natural warning calls triggers a flight reflex that the animals cannot adapt to. It is precisely this principle – speaking the rats' own language instead of simply emitting a generic tone – that makes Repello's technology unique and scientifically verified.

Bioacoustic technology – the next generation of rat repellers
Researchers have developed a technology that goes further than ordinary ultrasound. Instead of a constant tone, varied signal patterns are used that imitate the rodents' own warning calls – known as bioacoustic signals. In nature, these calls signal acute life-threatening danger, and the instinct to flee is so deeply rooted that the animals react immediately.

Repello's rat repeller is built on this very patented technology. The product uses a unique sound chamber that amplifies the signals up to 30 times compared to conventional ultrasonic devices, and automatically alternates between frequencies in the range of 28–85 kHz. In an independent field study – where wild brown rats in an established population were monitored with infrared cameras over three weeks – the technology showed up to 100 percent reduction in rat activity. Every rat that was registered stopped, turned around and left the area. Not a single individual ignored the signal.

Does a rat repeller work against rats that are already there?
Yes. The field study was actually conducted on an established, wild rat population in a basement where brown rats had been present for a long time. The results were clear: the rats began leaving the area immediately when the unit was activated, and activity dropped by up to 100 percent – even in severely affected environments.

Unlike physical traps, which only catch one rat at a time, or poison baits that take time and leave dead animals in hard-to-reach places, Repello provides continuous protection across the entire space. The rats leave the area on their own, meaning you avoid bad odours, clean-up and dead animals in the walls.

Repello therefore works both to drive away rats that have already settled in and as long-term, preventive protection. For best results, we also recommend sealing openings where rodents can gain entry and storing food in sealed containers.

Where a rat repeller is most useful
Certain spaces are particularly vulnerable to rodents. A rat repeller can make a significant difference in the following locations:

Basements and crawl spaces – damp, dark spaces where rats like to build nests. Place the unit near the entrance for best results.

Attics and roof spaces – warm, undisturbed spaces that attract rodents during winter.

Garages and storage rooms – often with small openings and stored materials that offer both shelter and food.

Kitchens and utility rooms – water pipes and food scraps make these rooms particularly attractive to rats.

Cottages and vacation homes – houses that stand empty for long periods are especially vulnerable. A rat repeller running year-round provides protection even when you are not there.

Restaurants and food premises – where hygiene is especially important and poison is not an option.

Farms and stable environments – large spaces with feed storage that attract rodents.

Repello's rat repeller – technology and specifications
Repello is a mouse and rat repeller based on patented bioacoustic technology. The product has been evaluated in an independent field study on wild brown rats, and is the only rat repeller on the market with scientifically documented effectiveness.

• Frequency range: 28–85 kHz (automatically alternating)
• Sound amplification: Up to 30 times stronger than conventional ultrasonic devices thanks to a unique sound chamber
• Coverage: Up to 40 m² per unit
• Energy consumption: 2.8 W – low operating cost even with continuous use
• IP rating: IP21
• Installation: Plug into a wall socket near the floor – ready to use straight out of the box
• Maintenance: No accessories or service required – completely maintenance-free operation
• Safety: Inaudible and invisible to humans, dogs and cats. Not recommended in the same room as domestic rodents
• Guarantee: 30-day satisfaction guarantee – try it risk-free