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 function :yeslow volume alarm:yesoperating tep:-5°c~+55°cstoring tep:-20°c~+70°c