Best in Class optical clarity, with Balder Technology. 3-in-1 helmets feature weld, grind and torch modes. Comes in variable shades, from 5-13. Includes four independent sensors positioned to reduce possibility of blockage during weld. Sensitivity and delay adjustments for different tasks and durations. Operates on two, easy-to-replace AAA batteries (included) with low battery indicator. Intuitive digital control panel. Built-in magnification lens holder. No retainer for easy helmet installation and removal.