Features:- High strong materials and fire retardant，can prevent resistance，anti-aging High definition protective filter，you can see the welding conditions clearly when weling the goods. - Welding luminosity is soft and comfortable.- It works the moment you start work，this products adopts advanced circuit design.- Striking the arc，the observing window darkens immediately.- Permanent UV/IR protection Fashion appearance.ultra light designing ，wearing comfortable.- High performance solar cells and lithium battery sensitivity and delay time can beadjustable.- Grinding and weling mode can be chosenMasks materials: PP LightStates: DIN 4Dark states:DIN9-13 free adjustment(Outside Variable)View Area: 9.2 x 4.2cm/3.62 x 1.65 inchResponse time(bright to dark): <1/30000 seconds(normal tempteratur conditionsSensitivity (welding based on current size): Adjustable low/highBattery: Lithium battery+solar cells，no battery change required.UV protecion:16 levelsWorking temperature: -5��~55��Storage temperature:-20��~70��Product Size: 180x 280x 220cm / 7.09x 11.02x 8.66inchHead Circumference Diameter: ��-15cm / 5.91inch ~ ��18cm / 7.09inchWeight: 516g / 18.20oz / 1.14lbPackage Size: 270x 240x 270mm / 10.63x 9.45x 10.63inchPackage Include:1 x Welding Helmet1 x User Manual