Ultrasonic Pest Repeller (Set of 4) with Night Light to Eliminate All Insects and Rodents like Mosquito, Rats, Mice, Cockroach, Fly, Ant, Roaches & Spiders. The smartest way to eliminate different pest without using any dangerous chemical. Safe - No Poison, No Chemical, Use Ultrasonic Frequency to Repel Pests. Recommended use for the house, office, warehouse, store, room, hotel, retail store. The best effect at 50 square meters or less, installs one in each room for best result. At Home Pest Control, Save Money & Environment, Safe for Children and Pets.