2 Optical Sensors: Response time (light to dark): 1/30000s. Return time (dark to light): 0.15-0.8s. Dark state: DIN 9-13, which can greatly filter radiation and effectively protect eyes. Large Field of Vision: 100 x 56mm PC protection can create a wide field of vision. Ergonomic design and adjustable headband minimize pressure on the head and neck. Suitable for long-term work; It is balanced with a comfortable, adjustable and anti-fatigue headgear. High Quality Material and Good Safety: The welding helmet is made of PP plastic, it is lightweight, sturdy and therefore protects against sparks, spatter and radiation, the battery is powered by solar cell technology and has a longer service life. Adjustable Sensitivity and Delay Time: On the back of the helmet there is a "delay" and "sensitivity" setting: Adjust the sensitivity and dark to light time according to the situation. In the event of a power failure, the welding mask can still resist ultraviolet and infrared rays, which is your