Welding Helmet ADF Controls Knobs Battery Life 6 mo Battery Type (2) CR2450 Lithium Solar Cells Color Green/Black Features Auto Shade 3/10 ADF Graphics Lines Grind Mode No Helmet Material Plastic Helmet Type Auto-Darkening Number of Arc Sensors 0 Power Source Battery and Solar Series F Standards ANSI Switching Speed 1/20 000 sec Viewing Area 3.93 in x 2.63 in