This easy-to-use bark control collar will safely and effectively teach your dog to stop barking. The collar's vibration sensor detect the dog's vocal cords moving to help ensure no false corrections. Includes 6 levels of progressive static correction which means if your dog continues to bark the correction with automatically increase to the next level until he stops. No programming needed. Waterproof. Uses PetSafe Battery No. RFA-67D-11. For dogs 8 lbs or more. Neck sizes up to 28".