Ultrasonic Insect Repeller: It can effectively drive away house mice, large rats, cockroaches, mosquitoes, fleas, crickets, flies, moths, wood ants, ants, and most pests. The ultrasonic sound pressure generated by this machine will make pests give up their food sources and water and move away from their hiding places. This high-pressure ultrasonic sound is far away from the feeling range of human ears, and it will not cause any harm to humans (including infants and pregnant women) and household pets (such as cats, dogs, fish, birds, and farm animals), nor will it interfere with television, radio, electronic security systems, fire alarms, and smoke detection. It is safe and environmentally friendly.