The BaByliss Hydro-Fusion 4-in-1 Hair Dryer Brush dries and styles in one. The hot air styler has 4 interchangeable attachments to dry, smooth, straighten and add volume and shape.The Advanced Plasma Technology uses a moisture balancing dual ionic system which combines both positive and negative ions, that work together to hydrate the hair and to eliminate frizz as you dry and style. The hair is left feeling silky and conditioned with luxurious shine.