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 Fig.1). Filtrating precision 0.3¦Ìm, filtrating efficiency 99.97%. Light state: DIN3 or 4 Dark state: DIN9(8)-13(14)( Stepless Regulation) Switching time: < 1/25,000S at Room Temperature Delay time: Stepless Adjustment < 0.15S ~0.80S Sensitivity adjustment: Stepless Adjustment Battery: Li-Mi & Solar Combination (Min. Lifetime: 5, 000 Welding Hours) Viewing area: 98 X 43MM (3-6/7'' X 1-4/5'') Size of filter cartridge: 110 X 90 X 9 MM (4-1/3'' X 3-1/2'' X 1/3'') Weight: 1.2KG Material of helmet: NYLON Available color: Blue/ black/ silver