Dear: High Quality，wish you like it! This is the new pro WELDING/Grinding HELMET AUTO DARKENING MIG TIG ARC hood TDB.This product is widely used in shipbuilding ，petroleum，Architecture，steel，boiler-manufacture and so on.The working temperature range is -10 degrees C~+55 degrees C.The limited storage temperature range is -20 degrees C ~+70 degrees C.The relative humidity range is 20%~80%.Product Specifications:Filter Dimension:110*90*8.5mmView Size:92*42mmLight State Shade:4Dark State Shade:9，10，11，12，13Shade control:ExternalSwitching Time:1/20000sSensitivity Control: AdjustablePower: Lithium batteries+SolarTime from dark to light:0.1~0.9s adjustableOperation Temperature:-10 degrees C~ +55 degrees CPackage include:1 x Auto Darkening Welding Helmet1 x User's instruction