Specifications:Main Features:- Auto-Darkening welding Helmets are designed to protect the eyes and faces from spark, spatter,effectively block the ultraviolet, infrared, visible light is more easy to pass，reduce the harmful radiation under normal welding conditions.- lithium battery with solar energy as a backup.- enough to mask the structure of space and very safe, comfortable to wear.- the choice of welding and grinding.- suitable for welding high operating temperature.- Outside the curtain quantity and sensitivity adjustable can make the operator operation more convenient,with manual level setting function automatically change light welding goggles.- left, right holder can choose the right size.- automatic dimming lens automatically dimming, this is a choice when light from the number of welding inspection.Viewing Windows : 95 x 50mm42mm Response Time : 0.15ms ~ 0.2msRetention Time : 0.4ms ~ 0.8msUltraviolet Protection : < 0.0003%(313nm-365nm)Infrared Protection : < 0.027%(780- 1300nm),