1),CE approved 2),View area 91x40mm 3),Solar cell with Lithium batteries 1),Filter size: 110 x 90mm2),Viewing area:91x 40mm3),Light shade:DIN44),Dark shade option:DIN9-135),Shade knob:Out6),Switching time: 1/25,000s 7),Recovery time: 0.4s 8),Power source: Solar cell with Lithium batteries9),Switching set for less than 20Amps TIG welding.