This professional AC motor hair dryer features positive ion technology which opens the hair cuticle, allowing nourishing treatments to penetrate for maximum results. The dryer's salon-quality AC motor has a longer lifespan. The motor generates salon powerful airflow and runs quietly for a comfortable experience. This dryer offers an ion +/- button for you to choose whether to use the ionic feature at a positive ion to open the hairs cuticle providing volume or a negative ion for long lasting, silky, frizz-free hair, as the negative ions smooth the cuticle and eliminates frizz for silky gorgeous hair that retains style for days. Available 2 concentrators and a diffuser.