Place the PetSafe Comfort Fit Bark Control Collar on your dog’s neck. When your dog barks, a harmless Static Correction is emitted. There are six levels of self adjusting correction for the standard Collar and eighteen levels of correction for the deluxe model. The bark collar automatically adjusts the level of Static Correction to your dog’s temperament. This Comfort Fit bark collar features the QuickFit buckle that provides a quick release and a perfect fit every time. This Comfort Fit bark control collar is 100% waterproof and has a One Year Warranty. The deluxe 18 level collar senses the vibrations in your dog's throat that happen only during barking. This prevents false corrections from other dogs barking. These PetSafe Comfort Fit Bark Control Collars are recommend for any dog over 10 lbs. It's durable yet light-weight collar is 100% waterproof and adjustable to fit any dog. Use the deluxe 18 level collar if you have two or more dogs together that could be barking. The Deluxe 18-level collar senses vibrations from the dog wearing the collar and will not correct him in error if other dogs are barking.