Use this Electronic Welding Shield to protect your eyes from sudden arcs The SIP Meteor 2185 Electronic Headshield boasts a fast light-to-dark response time, effectively protecting eyes from sudden arcs, powered via solar panel and Lithium CR2450 3V battery. Features:   4 shade for grinding 9 - 13 shade for ARC/MIG/TIG welding 3/10,000second light-to-dark response time Side-mounted dial for convenient shade control Test button checks headshield functions correctly Solar panel + 1x Lithium CR2450 3v battery Adjustable headband for extended comfort Lightweight construction Low power warning light 2 x light sensors Specification:  Filter Size: 110mm x 90mm x 09mm Viewing Area: 92.5mm x 42.5mm Outer Protection Lens: 107m x 89mm Inner Protection Lens: 103mm x 47mm Grinding Shade: Shade 4 ARC/MIG/TIG Shade: Shade 9 - 13 Battery/Solar: Lithium CR2450 V Response Time: 3/10,000 second Delay Time: 0.1 - 0.8 seconds Operating Temperature: -20°C to +65°C Net Weight: 0.48kg Packaged Dimensions: 290 x 280 x 280mm