SPEEDWAY 7664 is an auto-darkening welding helmet designed for protecting your eyes from harmful UV/IR radiation while welding. It features a wide viewing area (3.5" x 1.5"), allowing you to see clearly during welding. The helmet is powered by solar energy and 2 AAA batteries, ensuring a reliable power supply, it automatically turns on/off when you start/finish welding. Adjust the shade level (9-13) based on your welding job using the dark shade knob. Replace protective sheets when light transmittance is low.