The Victor Heavy-Duty Sonic Pest Chaser Rodent Repellent emits high frequency sound waves that effectively repel rodents from protected areas. With more than 2 times the power output of standard ultrasonic pest control units this Pest Chaser is ideal for use in larger rooms indoors such as kitchens garages attics and basements. A 6 ft. cord enables ideal placement. The sound is completely inaudible to people and non-rodent pets. Varying intensity and frequencies of ultrasonic sound waves prevents rodents from getting used to the Victor Sonic. Since the sound is inaudible a red LED light tells you the unit is working properly. It s kinder than traps safer than poisons when used as directed and there are no dead rodents to dispose of so it minimizes human contact with mice rats and other disease-bearing rodents. Reduction in rodent activity should occur within 6-10 days. Note: Ultrasonic sound cannot penetrate furniture cabinets or walls. Multiple units required for multiple rooms.