Ion Technology, Negative ions saturate the airflow, This helps condition, smooth and make hair shinier, while reducing frizz and stat 1000 Watt power provides just the right heat, this volumizer can be placed closer to the scalp for lift, 3 Heat Setting for Styling Flexibility For voluminous blowouts, place Volumizer under the hair close to the roots and roll outward to the ends, Hold for 2 to 3 seconds under roots, Less Time Working on Your Hair, Less damag​e While the shaft is about 2", the bristle-tip to bristle-tip width is 4" at its widest part, The tool is about 18" long, This is important to see if your hair is long enough for this tool Oval Brush Design, Unique Shape for smoothing the hair, while round edges create volume, Brush is designed with Nylon Pin & Tufted Bristles for easy detangling