Physical mosquito repellent, safe no radiation, very low ultrasound, harmless to human body, no pollution to the environment. Intelligent frequency conversion, using modern microelectronic technology, can emit electromagnetic waves and ultrasonic waves. Is currently the world's comprehensive strong, high integration, functional cash of an electronic mosquito repellent. It can deeply remove the pests and rats in the cracks of the wall. The frequency of the generated sound wave changes automatically and intermittently, which better removes pests and rats.