INGCO Auto Darkening Welding Helmet-Black... Viewing Area:92×42mmCartridge Size:110×90×9mmArc Sensor:2Optical Class:1/1/1/2Light State:DIN 4Dark State:Variable shade, 9 ~13Shade Control:External,VariablePower On/Off:Fully AutomaticSensitivity Control:AUTOUV/IR Protection:DIN 16Power Supply:Solar cells+2*CR2032 Lithium batteriesSwitching Time:1/15000S,from Light to DarkDark to Light(Delay):0.1-1.0 AutoLow Amperage TIG:≥10amps(DC), ≥10amps(AC)Grinding