Product Description Description : Solar Auto Darkening Welding Helmet Face Mask Electric Welding Mask Len Automation Filter Goggles Specification : Suitable for most kinds of welding mode. Delay time can be selective. The user s eyes and face a full protection against UV and IR radiation during the entire welding process,even in the clear state. Sensitivity adjustment : you can according your working conditions choose. Dark state Shade No : DIN9-DIN13 stepless adjustment Specification : Transition time : 2ms 22 (72 ° F) Delay time(s) : <1s Power on/off Fully Automatic Power supply : Solar cells, No battery change required Rate of UV transmittance : 313nm<0.00006% 365nm<0.00006% Rate of IR transmittance : 780~1300nm<0.003% 1300~2000nm<0.009% Frame Dimensions : Approx. 11cm x 9cm x 0.9cm/ 4.33" x 3.54" x 0.35" Viewable Size : Approx. 9.1cm x 4.2cm/ 3.58" x 1.65" Package includes : 1 x Solar Auto Darkening Welding Helmet Len Net Weight: 93g