The Racan Triple Sonic Pest Repeller adopts modern micro-electronic technology to solve the age-old problem of pests. This device can give out 3 kinds of electronic waves simultaneously and alternatively. It uses super-low electromagnetic wave and 2 kinds of special ultrasonic waves which can humanely act upon the hearing and the nervous system of rodents and insects to make them feel uncomfortable so they flee away to new territories. For use indoors to keep your home free of unwanted pests like mice, cockroaches, ants, spiders, crickets, bugs, fleas, moths, even mosquitos etc.