The Attack Wave Pest Repeller™ is an effective, user friendly and environmentally safe way to combat rodents. The device produces strong sound pressure in the air, attacking the auditory and nervous systems of rodents causing them to abandon their food sources and shelters.The ultrasonic sounds continuously penetrate up to 5,000 unobstructed square feet. In addition, the Attack Wave Pest Repeller™ utilizes automatic wave variation, minimizing the chance that pests become immune to the sound. Inaudible and harmless to humans and common pets• , this unit operates totally chemical and battery free, making it the easiest way to keep bugs on the run.Powerful Ultrasonic SoundHarmless To Humans And Pets• Environmentally FriendlyLow Power ConsumptionMaintenance Free• Do not use in the presence of Gerbils, Hamsters, Guinea Pigs, and other rodent pets.CE Approved