250 Amp Arc Welder 110v/220v Dual Welding Soldering Machine + Carbon Fiber Style Auto Darkening Helmet Kit Viewing Area: 3.65 x 1.65 Cartridge Size: 4.35x 3.55 x0.35 Switching Time: 1/30000, from Light to Dark Operating Temperature: 20 F to 135 F Low Amperage TIG: &gt;10amps(DC), &gt;10amps(AC)