Jackson Safety Nitro Variable ADF Welding Helmet (36633), Solar Powered, Sensitivity and Delay Adjustments, Black, 2 / Case 2 Jackson Safety Nitro Variable ADF Helmets / Case, Black Variable shade 9 - 13, sensitivity and delay adjustments; Viewing field 90 x 110 mm Lightweight - weighs only 1 pound fully assembled Three independent sensors; Solar powered, so you won't have to worry about changing batteries Meets ANSI Z87.1 - standards and is CSA compliant