Use High Quality Lcd And Multilayer Optical Interference Filter, Provides Clear View And Permanent Uv/Ir Protection Up To Din 15. With 3 Memory Settings For Easy Retrieval Of Preset-Welding Condition. Power Supply By Solar Cells, Lithium Battery (Cr2450 Replaceable. Part#Wcm-Cr2450). Helmet Shell Made Of High Impact Resistant Special Nylon. Ample Mask Space, Especially For Ears And Bottom Flare For Neck Protection. Extra Lens Provided. Specifications: Inside Pc Lens – 106 X 89.5 X 1 Mm, Outside Pc Lens – 114 X 133 X 1 Mm, Filter Cartridge Size – 114 X 133 X 9.5 Mm, Light Shade Number – 3, Delay Time (Dark To Light) – 0.1-0.9 S Adjustable, Sensitivity/Delay – Adjustable, Arc Sensors – 4, Grind Function – Yes, Memory Settings – 3, Operation Temp – -10-65 Degrees Celsius (14 – 149 Degrees Fahrenheit), Weight – 599 G.