*The Best Seller *Competitive price with good quality *Comfortable and covenient to use Automatic Welding Helmet1),Filter size:110x90mm2),Viewing area:92x42mm3),Light shade:DIN44), Dark shade:DIN9-135),Sensitivity:Low/High 6),Switching time light to dark:1/10,000s7),Delay time from dark to light:Rapid-0.15s,Slow-0.8s8),Power source: solar cell+Lithium battery