Sminiker Advanced Electronic Anti Bark Collar with Safe Training Sound, Vibration and  7 Levels Adjustable Sensitivity Control Button for Small Dogs and Puppies 7 SENSITIVITY LEVELS: Whether you're training your new dog or just need a break from nighttime barking, our collar features 7 sensitivity levels that activate only when your dog barks. The stimulation increases with each level until the barking stops for 30 seconds. Adjustable nylon collar senses vibration in dog's throat during barking