strong , and good long service Special designed goggles to protect the eyes from spatter , effectively block the , , visible light is more easy to pass ， reduce the radiation under normal conditions Auto-darkening filter automatically changes from to a dark when is , protect your eyes immediately when the is hit You can adjust shade from DIN9 to DIN13 by turning a shade knob And you can also adjustable sensitivity and delay time according to your, Manufacturer: Watreketal