A series of ultrasonic signals ensure that virtually all small mammals disappear in no time. These signals are inaudible to humans and have no effect on them.
In a free space it is sufficient for up to at least 100 to 150 m2. Outdoors it definitely works up to 100 meters.
It's excellent against rats, mice, bats and foxes. Pigs, cows and poultry are not adversely impacted.