Your barking buddy can be a problem, but LvLrister Safe Ultrasonic with Adjustable Ultrasonic Level Dog Bark Control Training can help! Avoid the stress of a barking pup with this paw-fect anti-bark device. This ultrasonic anti bark device is activated by sound detection sensors. When your fur baby starts barking, the device starts working and emits a powerful ultrasonic sound to stop the barking. With an adjustable frequency, you can find an ultrasonic range that works best for your four-legged friend, discouraging him from barking with ultrasonic reinforcement.