An advanced ultrasonic pest repeller with separate settings for mice, rats and crawling insects. The Pest-Stop 1000 uses fluctuating ultrasonic waves to cause auditory stress to pests. Direct plug-in design - use almost anywhere in the home. Covers 1 room, up to 1000 sq. ft. Ultrasound does not penetrate walls or other solid objects, and is best positioned with an unobstructed 'view' of the target area. Fluctuating ultrasonic waves cause auditory stress to mice, rats and most crawling insects, which disrupts their normal behaviour patterns and makes it uncomfortable for them to stay in the same room as Pest-Stop 1000. Safe and effective - no chemicals or traps.