-Darkened State: Shade DIN 9 to 13 Variable.~-Power Supply: Solar cells with built in rechargeable battery.~-Power On/Off: Fully Automatic.~-Sensitivity Control: Outboard mounted "Sensitivity knob", infinitely adjustable.~-Welding / Grinding Modes: Helmet can be to variable shade "weld" and fixed shade "grind" mode.~-Switch Time Light to Dark: 1/30000 s(0.000033sec) (-5°C, 0.0008 sec)# Switch Time Dark to Light: 0.25~0.8S at short-long position.~-Operating Temperature: Use between 23°F (-5°C) and 131°F (55°C) only.~Storing Temperature: -20°C (-4°F) to + 70°C (158°F).-Helmet Material: Light impact resistance nylon shell.~-Color: Woodland