Ultrasonic and electromagnetic pest repeller. Pest Repeller for the whole house is a proven best-seller, effective against mice, rats, ants and most other crawling insects. The electronic pest repeller that covers the whole house (up to 2000 sq. Ft). Equipped with two pest repelling functions:1) Ultrasonic Waves2) Electromagnetic Function. 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.