4 Independent ARC sensors with adjustable sensitivity and delay controls. Safer and more comfortable with auto-darkening window. Lens auto-darkens in 1/10,000th of a second. Grind: Protection against flying particles (EN175B). Extended throat guard for protection. Extra large viewing area. True Color Technology: Allows a color realistic perception. External knob dark shade: Adjusts from #4-10 to #8-12, Light shade #3. Side Window: -Light State: DIN3. -Dark State: DIN 10 or DIN 11. -Viewing Area: 2(pcs)x80(Top)/35(Bottom)x68(Height) mm; 2(pcs)x3.15" (Top)/1.38" (Bottom) x 2.68" (Height). Main Window: -Light State: DIN3. -Dark State: DIN4-8/8-12. -Viewing Area: 115x85 mm (4.53" x 3.35"). -Switching Time: 2A. -Grinding: Outside & Switch. -Power Supply: Replaceable Li Mn & Solar Combination. -UV & IR protection: Up to shade 16. -Certification: CE ANSI AS/NZS. -Weight: 610G (1.35 Pound). -Material of helmet: Nylon. Replacement protective lens are available