Get rid of mice, ants, spiders, and other pests without messy traps or poisons. The Ultrasonic Pest Repeller with ultrasonic power uses wiring within the walls to emit a signal that drives away insects and rodents. The plug-in unit protects one floor level. It is safe and effective for use in home and offices. Just plug it in and it drives pests out. The speaker broadcasts various ultrasonic sound waves and the LED indicator lets you know when the unit is working. It uses constantly changing ultrasonic signals which most rodents have a difficult time adapting to.