... high and durable 3.Clear vision welding helmet 4.Against UV Switching Time (From Light to Dark): 1/25000s; Power Supply ... -1300nm<0.027%Protection: Eye: en3791/2/1, Face: en175, UV/IR: shade16 (en169)Power Supply: Solar Cell + Lithium Batteries; Unnecessary to ... save consumption.3) High-powered optical lens could block all UV& IR, protect user's face & eye and avoid of ophthalmology, eye ...