About Product:Electronic Insect Repellent Is a New Type of High-Tech Electronic Product. It Uses Frequency Sweeping High-Frequency Ultrasonic Circuit to Generate Frequency Sweeping Ultrasonic Wave of 20~55KHz. Scientific Research Has Found That Mosquitoes, Eunuch, Mice, mites and Other Pests in This Frequency of Sound Wave Range, Their Endocrine System and Physiological Functions Will Produce a Mess, So as to Play a Driving Effect, Ultrasound Is Harmless to Human Body and Other Animals, because Sound Waves over 20KHz Cannot Be Heard by People. Because It Is Safe, Non-Toxic, Tasteless and Efficient, It Has Been Widely Used.. The Prices on the Website Are Not Traded. Different Specifications Have Different Prices. Welcome to Inquire.