The Electronic pest repeller that covers the whole house (up to 2000 sq. ft.). Pest-Stop 2000 is a proven best-seller, effective against mice, rats, ants and most other crawling insects. This unit is equipped with three pest repelling functions: 1. Ultrasonic waves function. 2. Mosquito function. 3. Electromagnetic function The mosquito setting emits an ultrasonic signal, which deters mosquitoes in the room where the unit is positioned. Direct plug-in design - use almost anywhere in the home. Safe and effective - no chemicals or traps. Will not affect humans, cats, dogs, fish or birds.