As-one auto-darkening welding mask, true color, 91 x 39 mm viewing area, 400 g. heavy-duty mask with fast-darkening auto-filter (0,05 ms) that detects sparks and high-intensity lights. light state din 4, dark state din 11, and uv/ir protection din 15. filter dimensions: 110 x 90 mm. built-in lithium battery with solar charging. operating temperature: -5 °c to +55 °c. suitable for welding and grinding.