GSB Auto-Darkening Welding Helmet (Matte Black) Viewing Window: 3 1/2" x 1 3/8"; Cartridge Size: 4 1/4" x 2" x 3/16"; Arc Sensor: 2 Electromagnetic Arc Sensing eliminates: Sunlight interference - Outdoors, Low-Amperage Lens Opening - TIG, Lens Openings - Pipe/Curves, Obstructed Sensors - Hidden/Cavity Welds Light State: DIN 3; Dark State: 10 or 11 or 12; Shade Control: Unadjustable; Power On/Off: Fully Automatic; Sensitivity Control: Unadjustable UV/IR Protection: &lt;0.0003%(301nm), &lt;0.0006%(365nm), &lt;0.001%(780nm-20000nm); Power Supply: Solar Cell and Lithium Batteries Lifetime: 3000 hours; Switch Time: 0.5ms; Delay Time: 0.1s-0.7s Auto; Low Amperage TIG: 10 amp; Operating Tep.: 14F to 140F; Total Weight: 0.9 lbs; Storing Tep.: -4F to 158F; Includes Accessory Package: One outside Cover Len; Warranty: One Year; Certificate: CE, ANSI