LESOLEIL Electrical Welding Helmet Solar Energy Automatic Grinding Mask Auto-darkening function: the viewing zone darkens automatically when detecting light and back to translucent when welding completes. UV/Infrared-resistant: blocks 99% ultraviolet and infrared radiationensuring a long-time operation without worrying about the injury of the harmful radiation. No battery needed: the solar charging system will charge the inserted battery automatically. Anti-interference design: capable of using under severe circumstance. Safe structure, full protection, easy operation.