High quality electronic welding helmet built to exacting professional standards. Provides complete, reliable lightweight protection and is also extremely comfortable to wear. Equipped with a high quality shade 4/9-13 electronic autodarkening filter lens. Switching time from clear to dark is approx. 0,005 s (0,5 ms), providing quick and effective protection. Powered by solar cells with an enclosed back-up lithium battery. Ability to work hands-free. Optimal protection from eye damage caused by the welding arc