... technology of Germany 3.High-definition visual effect. Latest style Auto darken Welding Helmet EH-221/EH9242 1. Model :EH-221, ... cells, two lithium batteries be changed.10. Switching time of Auto darken Welding Helmet :a) Light to dark: 1/25,000s.b ... Automatic.13. EH-2 Helmets Series Adapt to ADF: EF9040J, EF9040,EF9242,EF9646,EF9848.14. Latest style Auto darken Welding Helmet Colour: blue,green ...