The Forney 55655 Anarchy Auto-Darkening Welding Helmet is extremely lightweight and durable with a high impact resistant nylon shell. Ideal for all welding applications. Provide reliable protection against UV/IR emissions, heat, sparks and spatter in both the dark (#13) and light (#4) state. Solar cells with built-in replaceable 3V lithium batteries. When striking an arc, the filter automatically darkens and provides the following advantages: Hands free use; UV/IR protection to your eyes and skin with full protection against UV/IR rays at all shades and in the off position; Faster, more efficient welding, better accuracy and quality with less fatigue. Solar powered with four optical sensors. The helmet includes a ratcheting headgear with built in sweatband and extended bib to protect the neck from hot spatter. Contour design for optimal protection. Forney Industries is one of America s longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm & ranch and do-it-yourself markets. For more information, visit www.forneyind.com. If you ve got metal working questions, we ve got answers. We re committed to your success regardless of location size or needs. Please contact our customer service team at 1.800.521.6038 or firstname.lastname@example.org.Viewing Area is 3.86 inch (9.8 cm) x 2.17 inch (5.52 cm). Light Shade is at #4. Switching speed is 1/30,000 of a second. Meets ANSI Z87.1 safety standards. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.