Advanced filtering technology, uniform light transmission, clear imaging.Made of PP material with good toughness and weather . Novel appearance design, super light, durable shell.Double filtering to avoid harmful ultraviolet and infrared radiation from electric arc and eye damage caused by strong welding light.Automatically dimming during welding, the dimming time is as short as 1/10000s. The working principle of the dimming screen is demonstrated.When the arc is generated, the dimming lens will darken from the normal state.Soft silicone edge effectively prevents light leakage, care for the face; Adjustable straps, universal fit for different people,comfortable to wear. supply: 1pc x button battery(built-in)Size: about 24x20cm(HxW)Light shade:DIN4Dark shade: DIN9-13Way to shift dark state: outer control/steplessOperating temp:-10-65Switching time:1/10000sDelay time :01-08sArc sensor: 2Sensitivity adjustment: stepless controlScope of application: electric welding, argon arc welding, gas protection welding, tin welding, etc.Colour:blackMaterial:PP + siliconeSize:24x20cm Package Contents:1 x Welding helmetOnly the above package content, other products are not included.Note: Light 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.