... .1s~1s, choice of 4 shelves, red LBD direction. 1. Auto-darkening Welding Safety Helmet Model:EH-301, Configuration ADF Model ... . Power supply: solar cells, two lithium batteries be changed.10. Auto-darkening Welding Safety Helmet Switching time:a) Light to dark ... . Application:Mig/Tig/argon arc/arc welding/Gas welding.15. Auto-darkening Welding Safety Helmet Colour: blue,green,silver,black,yellow ...