Solar welding mask, optical class 1/1/1/1, one level dimming adjustment, 9 - 13, increased accuracy and weld quality, light-dark reaction time 1/20000 seconds, dark-light reaction time 0.3 - 0. 9 seconds with adjustment, solar glass shut-off function - can be used as a regular safety mask, better visibility thanks to larger filter size 98 x 55 mm, 4 sensors, UV and IR protection DIN 16, automatic start and stop, operating temperature - 5 + 55 degrees, solar glass plus two CR2450 lithium batteries, battery life over 2 years, easy battery change = no opening panel has easy access, low battery indicator and test, made of impact resistant plastic, improved helmet design.