Holulo Solar Power Variable Face Shade Auto-Darkening Welding Helmet Blue Arc Tig Mig Mask Welder Shield View size 93 mm X 43 mm(3.66" X 1.69") Color: Blue; Material: PA/PP; View size: 93 X 43mm(3.66 X 1.69); Auto-Darkening welding helmet are designed to protect the eyes and face from sparks, spatter, and harmful radiation under normal welding conditions. Filter dimensions: 110mm X 90mm X 9mm; Light states:DIN4.8, welding helmet.Our welding helmet is featured with a huge viewing size auto lens, which is extremely fast responsive to electric arc from TIG, MIG, MMA or Plasma applications. Can be used on grinding, cutting and welding applications. Dark states:DIN8-12 ;Dark states:DIN11 ; Variable optical response time: 1/10000s Recovery time: 0.1s/0.8s; Power supply: Solar cell and lithium batteries, lithium batteries capacity: 60mAH; Arc number of sensors: 2; Arc number of sensors: 2 . It is a perfect upgrade from goggles and fixed shade glass welding helmet, or from a small size old auto lens helmet at a very reasonable cost. Note : If you have any questions about the use and installation of the product, please contact us for the freely , we will promptly reply to you