Shop-Tek Welding Helmet, Auto-Darkening, SH-777HG Full range UV/IR protection up to shade DIN 16 all time. Solar powered auto-darkening filter helmet Auto switching time: light to dark is 1/30,000 Seconds. Full face coverage Darkness shade control (DIN) from 9-13, Clear shade 4 In full conformity with CE and ANSI Z87 standards. Charges with exposure to welding or sunlight Operation Temperature: -5 degrees C ~ 55 degrees C. Viewing Area: 98mm x 43mm(3.86" x 1.69")