Ultrasonic Sound Safety
Children and young people are more sensitive to ultrasound waves and indeed may actually hear a portion of the sound output from ultrasonic equipments.
While we would not recommend anyone who hears the unit sitting within range, as this is not an enjoyable experience, the units are designed so that the output is below the threshold to cause any damage to hearing or other physical harm. The sound is not pleasant but the volume is well under any level of intensity (loudness, decibels) that would cause injury, whether or not it is “heard.” It makes animals leave by making the space uncomfortable, not dangerous.
Occasionally any ultrasound device – just like many useful tools – can become a problem when it is not used according to instructions.