Use High Quality Lcd And Multilayer Optical Interference Filter, Provides Clear View And Permanent Uv/Ir Protection Up To Din 15. Power Supply By Solar Cells, Lithium Battery (Replaceable). Digital Low Battery Warning Indicator. Mask Made Of High Impact Resistant Special Nylon. Ample Mask Space, Especially For Ears And Neck. Adaptor For Plastic Magnifying Lens. Hardhat Adaptor Available: Part# Hhadapter. Specifications: Light Shade Number – 4, Sensitivity/Delay – Adjustable, Arc Sensors – 4, Grind Function – Yes, Memory Settings – 3, Operation Temp – -10-65 Degrees Celsius (14 – 149 Degrees Fahrenheit)