Limited Sale DEKO New Silvery Solar Auto Darkening Welding Helmet Welding Mask Shipping from US with Box Adopt new technology,have high degree of protection,effectively block harmful light. You can adjust the degrees from the 6 to 13 according to your work requirement. Avoid the lens blur at low temperatures because of breathing ,and ensure breath normally. lithium battery+solar cell(&gt;5000 welding hours)