ASHTON Solar Auto-Darkening Welding Helmet Model AWT-FG7 Viewing Area: 3.65 x 1.65; Cartridge Size: 4.35x3.55x0.35; Arc Sensor: 2 Light State: DIN 4, Dark State: Variable Shade, 9-13; Shade Control: External, Variable Power On/Off: Fully Automatic; Sensitivity Control: Low- High; UV/IR Protection: DIN 16 Power Supply: Solar Cells, Re-chargeable Battery; Switching Time: 1/30000, from Light to Dark Dark to Light: 0.1s-.75s; Low Amperage TIG: &gt;10amps(DC), &gt;10amps(AC); Ratcheting Headband