Automatic frequency change is more efficient - stronger ultrasonic waves automatically and continuously change from 20~60KHz every 30 seconds, making pests and rodents harder to immunize than before. Keep insects, mice, mosquitoes, spiders out of your home.Easy to use AI chip and plug and play - easy to use. Insert and use. The AI chip enables the ultrasonic repeller to emit breathing ultrasonic waves without having to manually change the frequency, just plug it into an outlet and turn it on.SAFE AND KIDS AND PET FRIENDLY - Insect repellent is odorless, quiet and radiation free. No dead pests. Its ultrasonic waves make pests uncomfortable and uncomfortable, which is inaudible to humans and pets. 100% safe for pregnant women, babies and pets.Surge Protection and Power Saving - Over 30,000 hours of comprehensive testing for durability. Brand new flame retardant ABS-A1 plastic, safe to use. If you have any questions about ultrasonic repellents, they can be quickly resolved within hours.