Supersonic Hair Dryer - Special Edition Intelligent heat control sets it apart: Unlike other models, the Dyson Supersonic hair dryer continually monitors air temperature over 40 times per second, expertly regulating heat output.Acoustically tuned: The powerful motor is tuned to produce one inaudible frequency3 speed settings - High for fast drying and styling, medium for regular drying, and low for diffusing4 heat settings - High for fast drying and styling, medium for regular drying, low for cooler drying and diffusing, and a cold shot for constant cold to set your hair after stylingNegative ions: Help reduce static in the hairFor use on dry and straight The Dyson Supersonic Hair Dryer is expertly engineered to protect hair from excessive heat damage, ensuring quick drying and precise styling..