Pest-X Electronic Pest Chaser (2/pk)Pests are deterred because they cannot adapt to the constantly changing array of ultrasonic 'noise' emitted by Pest X. Safe for use around children & pets No poisons, chemicals, or traps Targets rodents & crawling insects Use anywhere pests are seen Covers average size rooms; use more units for large spaces or in rooms with a lot of furniture Ultrasonic Frequencies the audible sounds emitted are above the range of most human hearing Warning: This