3 Training Modes & 6 Adjustable Sensitivities: This Dog Bark Collar provides three non-electric shock modes: Beep, Vibration, Beep and Vibration, press the “Switch” button to adjust the sensitivity level (6 levels) to effectively train your dog and deter bad behaviors. In addition, the sound and vibration barking deterrent methods put your pet’s health first, and you can switch modes at will by simply pressing the M button.