There are various plugins on the market that claim to emit high-frequency sounds to repel rats and other rodents. These devices are often marketed as "ultrasonic pest repellents." However, the effectiveness of these devices in getting rid of rats is a subject of debate and scientific studies have produced mixed results.
Some studies have suggested that these ultrasonic devices may have some repellent effect on rodents when used under specific conditions. For example, a study published in the journal PLoS ONE in 2012 found that ultrasound emitted at very high frequencies (above 20 kHz) and with high intensity could repel certain rodent species. However, the effectiveness varied depending on factors such as the specific species of rodent, the positioning of the device, and the environmental conditions.
On the other hand, other studies have failed to find consistent evidence supporting the effectiveness of ultrasonic pest repellents. Some researchers argue that rodents may quickly become habituated to the ultrasound and ignore it over time. Additionally, the ability of ultrasound to penetrate obstacles like walls and furniture may be limited, potentially reducing its efficacy.
Overall, the scientific consensus is that while ultrasound may have some potential as a repellent for certain rodents, it is unlikely to be a standalone solution for rat infestations. For best results, it is generally recommended to use a combination of techniques such as proper sanitation, sealing entry points, trapping, and, if necessary, consulting with professional pest control experts who can employ a comprehensive and targeted approach to rodent control.