Hoont8482; Indoor Plug-in Ultrasonic Pest Repeller with Night Light - Pack of 4 - Eliminate All Types of Insects and Rodents (Discontinued by Manufacture) PACK OF 4  Package includes 4 Hoont&#8482; Indoor Ultrasonic Pest Repellers. Great economic pest solution. Place one at each room or area where you are experiencing a pest problem. ELIMINATES ALL TYPES OF RODENTS & INSECTS  Protect your home from unwanted pests without using dangerous chemicals, sprays or traps that can harm you, your family, your plants and animals. Works for Rats, Mice, Ants, Roaches, Spiders, Bugs, Fleas, Bats and much more. MULTI- FREQUENCY ULTRASONIC WAVES - Features a mix of highly-effective ultrasonic frequencies, being extremely irritating to rodents and insects thus causing them to scramble to find a peaceful area, and will be forced to leave your home. The variable technology frequency waves ensure that pests do not get immune to the sounds. EFFECTIVE & ENVIRONMENTALLY FRIENDLY The Hoont&#8482; Indoor Ultrasonic Pest Repeller is extremely effective in ridding your home from all insects and rodents, COVERAGE AREA - The Hoont&#8482; Indoor Ultrasonic Pest Repeller is effective for an area up to 350 Sq. Ft. per unit. However ultrasonic sound cannot go around corners or penetrate hard surfaces like furniture, cabinets, walls, or ceilings. You will need one unit for each room where you have a rodent or insect problem.