About Product:It is a new type of high-tech electronic products AC-2033 electronic insect expelling device, it uses sweep frequency high frequency ultrasonic circuit, scanning frequency ultrasound for 25~65KHZ, scientific research found that mosquito and cockroach, Lang, rodents, mites and other pests in the frequency range of acoustic and the endocrine system, and the physiological function will produce flocculation chaos, which plays a role in repelling and killing, ultrasonic on human and other animals is harmless, because more than 20kHz sound wave person is unable to hear.Because of its safe, non-toxic, tasteless, efficient, so it has been widely used.