Pest Stop PS-4000MT Ultimate MT Pest RepellerThe Pest Repeller UltimateMT by Pest-Stop Professional is the only electronic indoor pest repeller to combine Ultrasonic, Electromagnetic and Ionic technologies for unsurpassed pest control. Transform your home or office into a fortress against pests without exposing your family to dangerous insecticides. Features:Just plug-inHigh pressure ultrasonic technologyElectro-vibrawave technologyUltra Ionic pest control technologyAutomatic LED sensor night lightDual high impact speakersAudible human test buttonNo poison, no chemicals, no traps!Designed to work through electrical wirings within the wallsHow it worksHigh Pressure Ultrasonic Utilizes the latest in Ultrasonic technology. High pressure transducers emit a powerful ultrasonic sound that normal speakers cant. Unheard by most humans and pets these sounds pound the ear drums of the small offensive critters which invade your home. Much like a loud siren the sounds intermittently attack the pests to drive them out. Third Generation Electro-Vibrawave This all new Electro-Vibrawave uses digitally processed Electromagnetic waves to reach even deeper into walls cracks and crevice throughout your home or office to repel even the impossible to reach pests. The methods which the Pest Repeller Ultimate AT uses allow the Electromagnetic waves to reach deeper than other repellers on the market. Ultra-Ionic Pest Control Technology Creates a stream of beneficial negative ions, to pull pollutants odors bacteria and other contaminants out of the air before you breathe them in. The ionic technology works to drive out ants, cockroaches, spiders and other insects. Bright LED Sensor Uses very little energy and will virtually outlast the repeller itself. Beautiful light to add a soft glow to any room at night. Help see your way through a dark hallway, kitchen bedroom bathroom or any where you want to plug it in. Repels Ants, Beetles, Cockroaches, Lizards, Mouse, Mosquitoes, Silverfish, Spiders, Squirrels, Termites, Ticks, Rats etc