American Eagle Flag Solar Auto-Darkening Welding Helmet CE/EMC, GS And ANSI (Z87.1) Certified - 4" x 5" Cartridge With 5.6 Sq Inch Viewing Window Replaceable Lithium Battery (CR2032) Backed Up With Solar Cell 1/25,000s Switching Time From Light To Dark - 0.1-1.05s From Dark To Light By Variable Dial Knob Light State: DIN 4 - Dark State: Variable Shades, 9 to 13 - Sensitivity (Low-High) Control By Dial UV/IR Protection: DIN 16 - Operating Temperature: 20 - 131 Degrees Farenheit