4.This welding lens has a fast response time and provides better protection for the welder. 3.The solar auto darkening welding lens adopts sensitive arc sensor, which have a stable and reliable performance. 1.This welding lens has large view window, which provides clear and larger viewing perspective, and reduce fatigue of eyes. 2.With a solar panel to charge with battery of welding helmet which can prolong the service life of the helmet. 5.Viewing area: 100 x 50mm, Product Size: 110 x 90 x 9mm, Weight: 0.25904315785 pounds, Manufacturer: Tuidzljd