Auto Darkening Welding Helmet. Spec-Viewing Area-92X42mm, Grinding Mode-Yes, Switching Time-Light To Dark-0.3Ms, Delay Time-0.1 To 0.8 Sec, Light States-Din4, Dark States-Din-9-13, Power Supply-Solar Cell And Li Rechargeable Battery, Total Wt-500 Five Hundred Gm.