Solar Powered Auto-darkening Welding & Grinding Helmet Hood Protection Mask, Battery and Solar Combo, CE Approved, Strips Red Solar powered auto-darkening filter helmet with OVERSIZED LENS, Big Viewing Area:100*49mm Solar Powered with Lithium Cell backup Darkness shade control (DIN) from 9-13, Clear shade 4 Auto switching time: light to dark is 1/25,000 Seconds Operation Temperature: -5 degrees C ~ 55 degrees C