Lotos LTSWH500 Solar Powered Auto darkening Tig MIG Stick Plasma Cutter Welding Helmet with extra 1 lens Viewing Area: 90 X 40mm Super Fast Darkening Speed: 0.0001 Seconds or 1/10,000 seconds Meets ANSI Safety Rating: ANSI Z87.1-2001 Light Shade: Shade 4 Dark Shade: Adjustable 9 to 13