The Repellio Pest Repeller uses ultrasonic sound technology to deter pests like rodents and insects. While many users report its effectiveness, it's essential to consider any potential side effects it may have on pets and humans. Ultrasonic frequencies are generally considered safe, but sensitivity can vary among individuals.

Some users have noted mild discomfort, such as headaches or stress among pets, especially dogs and cats, when exposed to the high-frequency sounds. These side effects are typically temporary and subside once the device is turned off or moved to another location. Understanding how these sounds interact with your living environment is crucial for optimal use.

In summary, while the Repellio Pest Repeller can be an effective solution for pest control, awareness of sound side effects is vital. Always monitor your pets' and family members' reactions when first using the device, and consult a veterinarian if you notice any persistent issues.