First, the bark control offers 10 combinations of vibration correction. When the dog barks vibration is delivered from one of the two Vibration Points. The duration of the vibration is random, which interrupts the dogs bark. When used according to instruction the Vibration Bark Control Collar safely reduces (and in most cases eliminates) nuisance barking. Second, the Vibration Bark Control Collar includes Patented Perfect Bark technology. It uses both vibration and sound sensors (dual-detection) to discriminate each bark from other external noises. This ensures your dogs bark is the only sound that will cause the correction. As a built-in safety feature, if your dog barks 15 times or more within a 1 minute 20 second period, the Bark Control Collar will automatically shut off for 1 minute.
The Petsafe Ultrasonic bark control uses a microphone to pick up the sound of your dog's bark, the unit then emits an ultrasonic tone that can be heard by your dog but is silent to most humans. Startled by the high-pitched tone the dog should stop barking as it will associate its bark with the unpleasant noise.