Pests are a big problem. They can get in our houses raid our food and crawl on us while we sleep. We don't want to pour out our cereal in the morning and have roaches fall out. Getting eaten by mosquitoes while sleeping is no fun and having your RV trailer over run by ants and mice is downright nasty. - Ultrasonic pest repeller keeps insects and rodents away - Ultra-effective ultrasonic technology deters mice rats ants and spiders from invading your home - Safe for use around children and pets. No need for dangerous chemicals poisons or traps - Plugs into standard AC outlet - Unit protects an area of at least 150 square (open field) metres from rodent infestation - Ultrasonic output frequency: 20kHz~55KHz - Working voltage: AC 180V-250V 50Hz AC 90V-110V 60Hz