Keep barking to a minimum with the PetSafe Core Digital Bark Collar, a safe and effective training tool for improving your dog's behavior. As barking begins and continues, the device responds with a mix of tone, vibration and static stimulation to quickly and effectively discourage excessive barking and whining. The collar uses 7 levels of static stimulation and 7 levels of tone and vibration , allowing you to choose between two correction modes. In Progressive Mode, the collar automatically increases correction levels with each bark until the barking stops, then gradually reduces intensity as your dog learns. In Manual Mode, you can select a fixed correction level that remains consistent, providing a personalized training experience for your dog. For added safety, an auto shut-off feature temporarily disables the collar for 30 seconds after 7 consecutive corrections. The durable and adjustable nylon collar is designed to fit dogs of all sizes and is waterproof up to 3 feet, and the rechargeable battery lasts up to 10 days from a quick 2-hour charge.