Powered air purifying solar auto-darkening welding helmet WHAD801 This product is a kind of powered air purifying solar Auto-darkening welding helmet that can proof dust ad gas (refer to figure 1) Filtrating precision 0.3μm, filtrating efficiency 99.97% Light state: DIN3 or 4 Dark state: DIN9 (8) to 13(14)(stepless regulation) Switching time: <1/25,000s at room temperature Delay time: stepless adjustment < 0.15 to 0.80s Sensitivity adjustment: stepless adjustment Battery: Li-Mi and solar combination Minimum lifetime: 5,000 welding hours Viewing area: 98 x 43mm (3-6/7 x 1-4/5 inches) Size of filter cartridge: 110 x 90 x 9mm (4-1/3 x 3-1/2 x 1/3 inches) Weight: 1.2kg Material of helmet: nylon Available colors: blue, black and silver