PetSafe PBC-102 Basic Static Bark Control Dog Training Collar6 LEVELS OF PROGRESSIVE STATIC CORRECTION customize to your pet to eliminate or reduce excessive barking NO FALSE CORRECTIONS vibration detection of your dog's bark ensures another dog barking or other noises will not cause a false correction PROGRESSIVE CORRECTION finds the right level for your dog by beginning with the lowest level of static and increases in correction level if the barking continues; Automatic safety shut off after 50 seconds