Automatically darkens to the set level of protection with Arc Ignition. Adjustable shade protection from 9 to 13. Solar cell powered when welding with battery back up. Solor cell extends the battery life. Progressive special absorbing filter lens protects from harmful (UV and IR) rays. ⚠ WARNING: This product can expose you to LEAD,DEHP, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.