SUNBEAM SB101 Electronic Insect Repeller (1 Unit) You can't hear a sound. It's totally silent and odor-free. There are no harmful pollutants Rodents and Insects survive because they've evolved different sensory mechanisms than humans, particularly sensitivity to sound waves This compact. electronic device uses sonic waves to repel mice, rats, fleas, crickets, spiders, silverfish, and even those pesky moths Plugs into any standard wall outlet 750 Foot Range