AUDEW Adjustable Auto Darkening Solar Welding Helmet Mask CE ANSI Certified Viewing area: 3.62 x 1.66 in (92 x 42 mm),Fully Automatic Power On/Off. 1/25,000s Switching Time From Light To Tinted,0.1-1.0s From Dark To Light Switching Time By Variable Adjustment Knob Sensitivity (Low-High) Controled By Adjustment Knob,Light State: DIN 4. Dark State: Variable Shades, 9 - 13,Auto Darkening Function (ADF) Self-Check. Power Supply: Solar Cell With Replacable Lithium Battery Backup (CR2032),1 Bonus Extra Replacement Lenses Included