This solar powered welding helmet is equipped with an auto-darkening lens that provides a 1/20,000 second switching speed (clear to dark) as soon as you begin welding. Featuring a lightweight comfortable design with an adjustable ratcheting headband for better fit and comfort. The solar powered welding helmet gives you full view of your welding area with a variable shade control from #9 to #13 with a resting shade of #4.