Helmets Masks are designed to protect the eyes and faces from spark， spatter， and harmful radiation under normal welding conditions. Suitable for high welding operation temperature. Outside shade number and sensitivity adjustable can make the operators more convenient while operating.Large view window dimension for observation easily. Auto darkening lens will automatically darkens to it's selected shade number when the light from welder is detected.Main Features:- Cushioned and adjustable head strap- Free sweatband- Variable delay time adjuster- Suitable for ARC / MIG / TIG / Stick welding- Variable shade control adjuster- Sensitivity adjuster- Grinding mode lens in permanent light shade- Manufactured by Dirty-Pro Tools UKOptical Class : 1 / 2 / 1 / 2Arc Sensor: 2Light State: DIN4UV/IR Protection : DIN 16Dark State: Variable shade， 9 ~13Power On/Off: Fully AutomaticShade Control: External， VariableSwitching Time: 1/25000S，from Light to DarkDark to Light: 0.1-1.0S by infinitely dial knobSensitivity Control: Low / High， by infinitely dial knobPower Supply: Solar cells， no battery change requiredLow Amperage TIG: ??10amps(DC)， ??10amps(AC)Grinding Function: YESOperating Temp: -5??~+55??Storing Temp: -20??~+70??ANSI / CSA / CE IR Protection Level: ANSI / CSA / CE UV Protection LevelViewing Area : 98 x 5mmProduct Size: 180x 280x 220cm / 7.09x 11.02x 8.66inchHead Circumference Diameter: ??-15cm / 5.91inch ~ ??18cm / 7.09inchProduct Weight: 516g / 18.20oz / 1.14lbPackage Size: 270x 240x 270mm / 10.63x 9.45x 10.63inchPackage Include:1 x Auto-Darkening Welding Helmet1 x User Manual