Welding Helmet ADF Controls Digital Battery Type CR2450 Color Black/Gray/Red EN379 Classification 1/1/1/1 Features 1/1/1/1 Optical Clarity 4C(Tm) Lens Technology Excellent Indoor Outdoor Performance Extra Large 12.5 Square in Viewing Area Hard Hat Compatible Low Profile External Grind Button Optimized Performance For All Welding And Cutting Proc X6 Headgear Graphics Polar Arc Grind Mode Yes Helmet Material Nylon Polycarbonate Helmet Type Auto-Darkening