Product Description ArcOne S240-9 Horizontal Single Filter 2-Inch X 4 1/4-Inch X .2-Inch - Shade 9 is the most economical, general use auto-darkening filter. This is great for Stick, TIG and MIG welding applications between 50 and 300 amps. This filter is solar powered so there is never any batteries to change, and has an incredibly clear light state of 2.5. This filter features two independent sensors, 5.25 square inches of active viewing area and switching speed of 0.5 milliseconds. This filter is water and dust resistant, and is equipped with a dark to light delay of 0.2 seconds and up to shade 16 U/IR protection. From the Manufacturer ArcOne S240-9 Horizontal Single Filter 2-Inch X 4 1/4-Inch X .2-Inch - Shade 9 is the most economical, general use auto-darkening filter. This is great for Stick, TIG and MIG welding applications between 50 and 300 amps. This filter is solar powered so there is never any batteries to change, and has an incredibly clear light state of 2.5. This filter features two independent sensors, 5.25 square inches of active viewing area and switching speed of 0.5 milliseconds. This filter is water and dust resistant, and is equipped with a dark to light delay of 0.2 seconds and up to shade 16 U/IR protection.