【Intelligent frequency conversion】 JUCHENG ultrasonic pest repellent adopts automatic frequency conversion ultrasound technology to emit ultrasonic waves of 22-65KHZ, to stimulate the auditory and nervous system of mosquitoes, cockroaches, mice, mites and other parasites to effectively ward off parasites from your home. 【Safe for humans and pets】 The ultrasonic rat repellent frequency is 22-65KHZ 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 mouse repellent can effectively prevent in indoor area up to 30-50 square meters of pests, can be widely used in homes, warehouses, offices, supermarkets, hotels, etc. It is recommended to install one for each room as ultrasonic waves cannot penetrate through walls and solid objects. But for areas with severe pests, we suggest installing 2 or more. 【Plug-and-play】 Just