The NoBark SBC-6 effectively and humanely stops barking when it's worn. When the vibration of your dog's bark triggers the Vibration Sensor Probe, a static stimulation is administered through the Contact Points. The NoBark SBC-6 starts with the lowest level of correction and then increases through 6 levels each time your dog barks within 30 seconds of the previous bark. If your dog doesn't bark again within 30 seconds, the NoBark SBC-6 will reset itself to the lowest level of correction. Along with each correction, there will be an audible beep. As an added safety feature, the NoBark SBC-6 will automatically shut off for 3 minutes if your dog barks 15 times or more within a 50-second period.