1 Jackson Safety NEXGEN 3-in-1 Digital Auto Darkening / CaseDigital controls feature variable shade 9 - 13 sensitivity and delay adjustments and 4 independent sensors are positioned to reduce the possibility of blockageViewing field 3.8" x 2.35"with built-in mag lens holderTypical switching speed 1/15,000 (s); Amber view lens allows for enhanced clarity of the weld puddleThis welder shield has Weld, Grind and Torch modes, auto-off function and a low battery alert (includes 2 solar replaceable lithium batteries)