Pest Free Plug-in ultrasonic pest repeller by Viatek uses one of the industries widest range of ultrasonic frequency. Viatek"s team has been manufacturing electronic rodent, rat and pest repellers since 1993. We will constantly strive to be the leaders in the world in advancements.The Pest Free Plug-in ultrasonic pest repeller uses ultrasonic frequency sound waves to create an unpleasant environment for rodents and arthropod pests like flees, cockroaches, etc. The Pest Free Pest Repeller emits an alternating ultrasonic sound that ranges in higher and lower frequencies. The alternating frequency allows the Plug-in ultrasonic pest repeller to target different pests. The constantly changing environment will cause pests to leave the area.By using a wide range Ultrasonic frequency, Viatek Pest Control pest repeller provides the most complete and powerful protection available on the market today. Advanced Intelligent sweep technology sends Ultrasonic Sound throughout the living area creating an unfriendly environment for pests. Pest control has never been so advanced and so simple.