Alpha Gold Variable Shade Lens

Specifications
⦁    Fits Most 2" X 4-1/4" Welding Helmet, Mask, or Other Similar Protective Devices.
⦁    Two Idependent Wide Range Photo Sensors
⦁    Solar Power Supply And Replacable Battery Extend The Lifespan Of The Product.
⦁    UV/IR Protection Up To Shade 16
⦁    Optical Rating 1/1/1/2
⦁    Variable Shade Range 3/5-13
⦁    Fully Automatic With No Switches Or Buttons To Activate.