3M L-156 Welding Shade

Switching time Less than 40 microseconds
Selectable shades Continuously variable from 9 to 12
Ultraviolet/Infrared Protection at all times
Light state Shade 2.75
Battery life Average 500 hours for 2 AAA Alkaline
Use temperature -5°C (23°F) to +55°C (+131°F)
Storage temperature -20°C (-4°F) to +65°C (+149°F)
Viewing area 2.4 in. x 3.8 in. (61 mm x 96 mm)
Auto shutoff After 20 minutes without switching.