ArcPro 20703 Auto-Darkening Solar Powered Welding Helmet with Grinding Mode, Lion on Fire Large 3.86-inch by 1.73-inch viewing field Shade DIN 9 to DIN 13 variable for welding; shade DIN 4 for grinding 1/25,000 second reaction time Stepless adjustable knob sensitivity control Automatic on/off switch with replaceable 3V Lithium batteries 3.86-inch x 1.73-inch viewing field Shade DIN 9 to DIN 13 Variable with Grinding Model 1/25,000 sec. reaction time Permanent Shade DIN 16 for UV and IR protection. Automamtic on/off with replaceable lithium battery