Welding Helmet, ADF Controls Digital, Battery Chemistry Lithium Ion, Battery Life 2,000 hr, Battery Type Disposable Cells, Color Graphics, EN379 Classification 1/1/1/3, Features Adjustable Sensitivity, Auto-On/Off, ClearLight(TM) Lens Technology, Gen 1 Headgear, Three Operating Modes, Two Independent Arc Sensors, Graphics Rise, Grind Mode Yes, Head Diameter Maximum 25 1/2 in, Head Diameter Minimum 21 1/2 in, Helmet Material Nylon, Helmet Type Auto-Darkening, Helmet Width 8 in