3 Pack Bell + Howell Ultrasonic Pest Repellers With Dusk-To-Dawn Sensor Light Get rid of mice, ants, spiders and other pests without messy traps or poisons. Ultrasonic sound waves help to eliminate Mice, Rats, Roaches, Spiders and Ants. Perfect for Use In: - Homes & Offices - Safe & Effective. Easy To Use. Just Plug It In!