Additional Details ------------------------------ Product description: 'Welding Helmet, Auto-Darkening, Lens Shade 9 to 13, 4.0 Welding Helmet Light State, Viewing Area 3.93 In. x 2.36 In., Welding Helmet Color Black, Welding Helmet Material Thermoplastic, Grind Mode Yes, Electromagnetic Sensor No, Number of Arc Sensors 4, Switching Speed 1/10,000 sec., Graphics None, TIG AMP Rating 5A, Power Source Solar, Headgear Ratchet, ADF Controls Digital, Battery Type Lithium, Battery Life 500 hr., Features Sensitivity and Delay Control, Standards ANSI Z87.1, CSA'