The Victor Ultra PestChaser emits high frequency ultrasound that effectively repels rodents. The Ultra PestChaser is ideal for large sized areas like homes, businesses or even warehouses. To keep rodents from becoming accustomed to the sound, the Victor Ultra PestChaser emits ultrasound at varying volumes and frequencies. With over 80 oscillations per second, this rodent repeller sounds like a jackhammer to mice and rats. The non-repetitive volume and frequency levels cause discomfort and an unfriendly environment that discourages rodent infestations. It is important to note that ultrasound does not travel through walls, furniture or other obstructions. Use one Ultra PestChaser unit per room and place in an open area. This PestChaser is safe for humans, cats, dogs, birds, and fish when used as directed. Rodent pets like hamsters and guinea pigs will simply need to be moved to a room without a rodent repeller. In order to be effective, a pest control effort needs to use several different tools and methods. First, rid your space of rodents using one of the many solutions offered by Victor; whether your preference is snap, electronic, live, or poisons, there is a solution to fit your needs. After the rodents are eliminated, use the Victor Ultra PestChaser to keep them away.