Ultrasonic 'Sound' Frequency Bark Deterrents

These no bark devices use ultrasonic sound (frequency) to distract dogs from barking behavior. This "sound" method of bark correction can only be heard by dogs, not humans, as the frequency is high enough that it cannot be detected by human ears. The use of ultrasonic frequency for bark correction is considered a very effective alternative to static correction and is commonly used for more sensitive dogs and area settings.