Professional auto darkening helmet has the largest viewing area. Lightweight design with multiple adjustments for maximum comfort. The 1/20000 lens provides a9-13 variable shade control, fully adjustable sensitivity and delay controls, with grind mode. Features 4 sensors. Ideal for low amp TIG and inverter arcwelding. 2 lithium batteries included. Two-yearwarranty. Model 770584, meets ANSI Z87.1-2003/DIN/CSA/TUV/CE standards. Wt. 3 lbs.