The Deluxe Little Dog Bark Control takes the work out of bark control - and keeps even the mightiest barkers quiet! PerfectBark detection uses both vibration and sound to make sure barking is the only sound to trigger correction. Plus, the Temperament Learning System automatically adjusts the 10 correction levels based on your dog's barking - no manual settings! Sleek and comfortable, the adjustable nylon collar fits neck sizes up to 16" and dogs up to 55 lbs. Durable and waterproof with a one year warranty.