Knot Out electric pet grooming comb is the ultimate pet grooming tool! Knot Out Pet Grooming Comb safely remove tangles and mats with just a touch of a button. Recessed blades comb and cut out tangles without coming in contact with pet’s skin. Knot Out leaves your pet’s coat groomed and smooth. Great for all dog and cat breeds. Requires 4 AAA batteries (not included).