Xw auto darkening welding helmet shades 9 13 grind function viewing area 40 x 100mm 2 arc sensors light state din 4 dark state variable din 9 13 uvir protection up to din 16 grinding mode standard 110 x 90mm outer cover lens switching time light to dark 130 000s dark to light delay 0 11s adjustable ratchet headband adjustable sensitivity stepless adjustable dark to light delay stepless solar powered no battery required ideal for mma migmag and st