Areyourshop AUTO Darkening Welding Helmet ADWH Tig Mig Welder Mask Lenses Solar Powered Auto-Darkening welding Helmets are designed to protect the eyes and faces from spark, spatter, and harmful radiation under normal welding conditions. Solar energy, no need to replace the battery. Not enclosed design, but can complete keep out welding spatter, summer won't be hot and winter will not appear water mist on lens because of man's breathing. Suitable for high welding operation temperature. Outside shade number and sensitivity adjustable can make the operators more convenient while operating. Specifications: Size of helmet: Width: 20 cm(7.87"); Height: 26 cm(10.23"). Viewing Area: 8.9 x 3.4 cm(3.50"*1.33"). Adjustable headband size: 52-61cm(20.47"-24.01"). Maximum height of headband: 11.5 cm(4.52"); Max. size of semicircle headband: 33.5 cm(13.18"). Minimum height of headband: 8.5 cm(3.34"); Min. size of semicircle headband: 26.5 cm(10.43"). Response time: 1/25000-30000s. UV Penetration Rate: 313nm0.00006%; 365nm0.00006%. IR Penetration Rate: 780---1300nm0.003%; 1300---2000nm0.003%. Operating Temperature: -5~+55. Storing Temperature: -20~+70. Automatically ON/ OFF function. 100% Brand new Material:Helmet Material High-Impact resistance Plastic / Polyamide Nylon Color:Same as picture show Package include: 1 x Mask