The safe structure design adopts a world famous style and conforms to the ergonomic principle, has sufficient internal space, which makes it easy to operate and comfortable to wear. The soft helmet housing material is resistant to high and low temperatures, corrosion resistance, -retardant and light-proof with high strength. Fine quality liquid crystal optical coating protects welding operator from harmful rays such as ultraviolets rays and infrared rays, etc (level of protection: 16 ). The design of automatic transform technology is uesd of controlling circuit, which makes it possible for goggles to be to react to the arcin 3/10000 second and change strong light to dark light. As a , it can protect eyes from being injured by sudden arc. design of anti-interference switch avoids not seeing welding object clearly due to complicated surrounding nearby. Dark shade DIN5-DIN9/DIN9-DIN13, stepless control, set by hand according to actual situation. Dark to light: 0.1s-1.0s, stepless control, and can be used for cutting, grinding protection. The goggles can be worn separately, and the buckle design is easy to remove. Active viewing area: 122.5 x 35mm / 4.8 x 1.4in Light shade: DIN4 Dark shade: DIN5~DIN9 / DIN9~DIN13 Way to shift dark state: outer, stepless shift Switching time: less than 3/10000s Sensitivity adjustment: stepless control Delay time: 0.1s~1.0s Power supply: 1 * CR2450 button battery, 3V, 550mAh (included) Operating temperature: -5~+55 Sensors to weld arc: 2 Protect grade against UVB: DIN16 Grind: YES Cut: YES Low battery: YES : no Working principle: Different with passive shading lens, passive shading lenses are made of various additives and pigment. ADF adopts LCD as lens, using the probe on mirror surface to probe the appearance and disappearance of arc when welding, and using the electricity to drive shading level of the LCD to achieve the goal of protecting you from harmful rays, and it also can ultraviolet rays and ultrared rays. In addition, hands are thoroughly set free, welding is more accurate. Therefore, efficiency is improved. Colour:As Shown Material:plastic Package Contents: 1 x welding Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.