Bio Ionic Universal Diffuser - Black Customizable airflow with extended fingers, for more targeted reach to scalp. With all vents open, a higher flow of air will come through the diffuser. Close some vents to create a more targeted, lower flow technique. Long fingers reach down to the scalp to dry roots and create lift when desired. Controllable airflow Extended fingers reach down into scalp Compatible with the 10X Ultralight Speed Dryer, PowerLight™ Pro-Dryer and the Gold Pro Speed Dryer. Use Keep all vents open for increased maximum airflow. Turn dial to lessen air flow.