Electric mosquito repellent function: used physical drive mosquito principle, no chemical drug, no bacteria residues, on family and pet are security; used sweep frequency way, only interference mouse hearing and the nervous system, on family and poultry no bad effects; full reflection, and refraction ultrasonic, covered room all range; power low, and life long, for long-term using products features: applies Yu family, and restaurant, and supermarket, and warehouse, and Office kindergarten, should not be drug killed mosquito cockroaches, again prevent mosquito entered of places.