Four redundant sensors in a staggered design eliminate blocked sensors. Soft touch controls eliminate contaminants. All controls protected from harsh welding environment. Smart View LCD provides fingertip control information with 3 in 1 multifunction capability (grind, weld, cut). Intellisense technology: allows unit to detect welds less than 5 amps. Clear-Vue light state: allows you to keep helmet down at all times. Fastest switching speed in the world. IR/UV protection at all times and filter always protects to shade 14 even in the "off" state. Non-curved cover lens prevents ghosting images. The EQC features replaceable lithium batteries, low battery indicator, and 800 working hours of battery life. Standard size outer cover plate and system has an auto shutoff after 20 minutes of downtime. Sold with the #1 selling welding hood on the market, the Shadow. Large window has 9 square inches of viewing area, two-year warranty, made in the U.S.A.