ASHTON SOLAR WELDING HELMET MASK AUTO DARKENING MIG TIG GRINDING ARC AWT-FG1 Viewing Area: 3.65 x 1.65 Cartridge Size: 4.35x 3.55 x0.35 Operating Temperature: 20 F to 135 F Dark State: Variable Shade, 9-13 Power Supply: Solar Cells, Re-chargeable Battery