Nesco Tools 4653 'Skull Graphics' Auto Darkening Solar Powered Welding Helmet Ultra high performance filters protects against UV and IR Variable shades from DIN 9 to DIN 13 Special turnover headband mechanism allows for greater comfort and reduces fatigue Utilizes high performance solar cells with 2 built-in 3 Volt lithium batteries as power back-up Complies with DIN, ISO, EN safety standards and ANSI Z87.1-2003 standards