1. The Viewing area of face mask: 91*41mm. 2. Electro-optical technology of Germany 3. UV/IR protection: up to ... Material & Weight: PA/ PP, 0.52kgs.4. Viewing area: 91*41mm.5. ADF Frame Size:110*90mm. 6. UV ... two lithium batteries be changed.10. Switching time of Face mask:a) Light to dark: 1/25,000s.b) ... /Tig/argon arc/arc welding/Gas welding.15.Colour of Face mask: blue,green,silver,black,yellow,red, ...