【Intelligent Frequency Conversion】The ultrasonic pest repeller adopts automatic frequency conversion ultrasonic technology to emit 20~55KHZ ultrasonic waves, to stimulate the hearing and nervous systems of mosquitoes, cockroaches, mice, mites and other pests to effectively keep pests away from your home. 【Insect Repellent Safe for Humans and Pets】The mouse repellent ultrasonic frequency is 20~55KHZ, and the human ear cannot hear the frequency above 20KHZ. As long as the repellent is not placed in the hearing-sensitive area of cats and dogs, it will not cause any harm to your pet. 【Wide Coverage Insect Repellent】This rodent repellent can effectively prevent an indoor area up to 80-120 square meters of pests, can be widely used in homes, warehouses, offices, supermarkets, hotels, etc. But for areas with serious vermin, we suggest installing 2 or more. 【Plug-and-Play Rat Repellent】Simply plug in our pest repellent, it works when you notice the foggy glow. This rat repellent should be