... protective wear, gas mask, welding mask, protective wear, welding helmet,automatic welding mask, auto darkening welding mask, auto-darkening welding helmet ... time(s) 0.6Power on/off Fully AutomaticPower supply Solar-li,No battery change requiredRate of UV transmittance 313nm<0 ... time(s) 0.6Power on/off Fully AutomaticPower supply Solar-li,No battery change requiredRate of UV transmittance 313nm<0 ...