Merr-Sonn Excluders were sonic devices manufactured by Merr-Sonn Munitions, Inc.. Handheld device, they emitted waves of high frequency sound that warded off many creatures while at the same time being inaudible to Human and many other alien species' hearing. It did affect some species, however, such as Wookiees. The Merr-Sonn Excluder had three settings, capable of creating a disruption field of 10, 20 or 40 meters, respectively.