Product Features:This Automatic Darkening Welding Helmet Automatically Darkens The Lens In 1/25、000 SecondAs Soon As You Start Welding. The Solar Panel Picks Up The Light Emitted From Welding AndTints The Lens To Your Desired Setting. The Ratcheting Headband Can be Easily Adjusted ForA Comfortable、 Custom Fit. The Wide Viewing Window Gives You A Full View Of Your Work AreaAnd Offers Complete UV/IR Protection.Auto Darkening Welding Helmet(Mossy Oak Style Camo):Viewing area: 3.62 x 1.66 in (92 x 42 mm)Fully Automatic Power On/Off1/25、000s Switching Time From Light To Tinted0.1-1.0s From Dark To Light Switching Time By Variable Adjustment KnobSensitivity (Low-High) Controled By Adjustment KnobLight State: DIN 4Dark State: Variable Shades、 9 - 13Auto Darkening Function (ADF) Self-CheckPower Supply: Solar Cell With Replacable Lithium Battery Backup (CR2032)3 Bonus Extra Replacement Lenses IncludedPackage Contents:1 x Auto Darkening Welding Helmet1 x CR2032 (Pre-Installed)1 x User's Manual3 x Replacement Lenses Net Weight: 875g