Features variable shade 9-12, sensitivity and delay adjustments. Solar assisted with two independent sensors. Versatile 3-N-1 built-in function weld, torch, grind. Amber view lens allows for enhanced clarity of weld puddle. Technology allows unit to detect welds less than 5 amps. Requires 2 AAA batteries included. Low battery indicator. Compatible with HLX 100 and HSL 100 shell. Auto on auto off. Built-in mag lens holder. Meets ANSI Z87.1 and CSA compliant. W50 series 3-N-1 auto-darkening filters: incorporates the versatility of variable shade setting, sensitivity adjustment, delay settings and a built-in 3-N-1 function (Weld, Torch, Grind mode). The welder doesn"t need to change to different equipment since it can all be done from the W50 Series ADF. It"s the right tool for any job.