illustrate: We have thoroughly studied the physiology and habits of dust mites and have found that the auditory nerves of dust mites are very fragile. It is very sensitive to ultrasonic waves of special frequencies. In response to this characteristic, we have developed a mite elimination device. Using microelectronics technology, the use of ultra-high frequency ultrasound to act on the central nervous system of mites to stop breeding, stop eating and escape pests quickly Features: Eliminate pests in your home with completely safe and non-toxic ultrasonic and pulse. The large area of the whole house can eliminate moths, and the ultrasonic coverage area can reach about 50-100 square meters without obstacles. 1. The multifunctional electroacoustic insect repellent uses ultrasonic frequencies to detect common household pests. 2. These frequencies are undetectable by humans and aggravate small rodents and insects, and are free of any toxic chemicals, making them completely safe to use at home.