AUDEW Pro Auto Darkening Welding Helmet Arc Tig mig Grinding Welders Mask Solar Viewing area: 3.62 x 1.66 in (92 x 42 mm). Auto Darkening Function (ADF) Self-Check. Sensitivity (Low-High) Controled By Adjustment Knob. Power Supply: Solar Cell With Replacable Lithium Battery Backup (CR2032). Auto-Darkening welding Helmets are designed to protect the eyes and faces from spark, spatter, and h