After grooming your pet with the Self-Cleaning Grooming Brush, simply click the button, and the bristles will retract back into the brush. Self-cleaning slicker brush for dogs, cats, and puppies removes loose hair and eliminates tangles, knots, dander, and trapped dirt. This is the perfect dog brush to remove all nasty mats out of your pet's fur. It works great on medium- to long-haired coats. Not recommended for short hair types. Use high-quality stainless steel to make bristles and soft needles for long-term use without deformation; reasonable needle spacing and deep cleaning of each hair by using a slicker dog brush. After grooming your pet with the Self-Cleaning Grooming Brush, simply click the button, and the bristles will retract back into the brush.