Milder Levels of Static Correction - 15 levels of safe, gentle static correction levels that automatically adjust to help teach your sensitive, timid or small dog to stop excessive barking. Learns Your Dog’s Bark - Our unique bark-sensing technology learns your dog’s bark to prevent your dog from receiving a false correction from other dogs’ barks or outside noises. Waterproof Collar - The waterproof design allows you to bark train inside or outdoors. Rechargeable Battery - Battery life is up to 40 hours of use and quickly charges in 2 hours using the included USB charger. Sizing - Collar fits dogs 8 pounds and up and the adjustable strap fits pets with a neck size up to 23 inches. Bark Collar You Can Trust - For 25 years, we have been the trusted brand in creating safe, high-quality, training products to help you and your pet live happy together. PRODUCT SUPPORT: PetSafe brand’s Customer Care experts will be glad to help; call Monday through Friday 08:00 to 20:00 and Saturday 09:00-17:00 at 800-457-3911 with any questions.