New type of high-tech electronic products , electronic insect expelling device, it uses sweep frequency high frequency ultrasonic circuit, scanning frequency ultrasound for 24-84kHz. It is widely used in spaces where needs to eliminate pest and have thermal sensor sparkled within an area of 4 meters. It is harmless to man and pets. And it adjusts to the different current in the most country. Its good quality ensure the operation life of product, which uses ABS plastic.