Using the Lincoln Viking 1740 GAME - ON welding helmet is easy. First, adjust the 3 - point pivot headgear to fit your head comfortably. Make sure the front and rear sweatbands are in place to reduce pressure. When starting to weld, the auto - darkening function will activate automatically. You can adjust the shade, sensitivity, and delay according to your needs. For grinding, switch to the grind mode with the LED indicator. Always keep spare AAA batteries on hand as they are user - replaceable. The solar cell provides main power, but having extra batteries ensures continuous use. After use, clean the helmet gently with a soft cloth. Keep it in a dry place away from extreme temperatures. The helmet comes with a 5 - year no - hassle warranty, so you can use it with confidence.