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Solar energy auto-darkening welding helmet is a set of spectral filtering technology, photoelectric inductive control technology, liquid crystal light control technology in one high-tech products. Auto darkening filter (ADF) works with the photoelectric induction principle, which makes the liquid crystal change from the bright state into a dark state in receiving the arc light, and automatic back to dark state when welding is finished. Thereby, protecting the user's eyes and face skin from theArc,Splash and nfrared/Ultraviolet Radiation. Specifications: Viewing Area: 3.62" X 1.66" Number of Arc Sensors: 2 Light Shade Number: DIN4 Dark State: Variable shade, 9 ~13 Shade Control: External, Variable Power On/Off: Fully Automatic Sensitivity Control: Adjustable UV/IR Protection: DIN 16 Power Supply: Solar cell. Re-chargeable battery Switching Time: 1/25000s, from Light to Dark Dark to Light: 0.1~1.0s, by infinitely dial knob Grinding Function: YES Package Included: 1 x Auto Darkening Welding Helmet 1 x User's Manual