Automatic Welding Mask - Built-in filter lens darkens automatically when welding. Response time less than 1/10000S.UV/Infrared resistant - Stepless adjustment from DIN9 to DIN13 (dark state) DIN4 (light state). UV transmissivity less than 0.00006%, IR transmissivity less than 0.003%. -10-55 operating temperature.Viewing area size - 3.62*1.65inch (92*42mm). You see the product color is blue-green when soldering. Suitable for most welding applications (MMA/MIG/MAG/TIG).PP ABS material - Adjustable headband provides a comfortable, non-slip fit while leaving the user's hands completely free to work . Safe structure, 360 protection, make welders operate more easily. Anti-Interference Design: Able to be used in severe circumstances. Package Contents: 1 x Welding Helmet, 1 x Adjustable Welding Helmet, 2 x Welding Helmet Lens (Outer Lens) , 1 user manual.