... welding safety helmet,auto darken welding helmet, welding accessories, arc welding helmet, auto-darkening helmet, arc protection helmet,welding face shield,mask, ... ) 0.6Power on/off Fully AutomaticPower supply Solar-li,No battery change requiredRate of UV transmittance 313nm<0.00006% ... 0.6Power on/off Fully AutomaticPower supply Solar-li,No battery change requiredRate of UV transmittance 313nm<0.00006% ...