AUDEW Adjustable Auto Darkening Solar Welding Helmet Forest Camo CE ANSI Certified 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). Package Contents:1 x Auto Darkening Welding Helmet ,1 x CR2032 (Pre-Installed) 3 x Replacement Lens.