Simple and Compact Design, Easy to use, Battery operated, Wide Viewing Angle, Darkens in 1/10000 Second, Automatic Power ON and OFF, Protects from UV and IR radiation, Light Weight, Field of Vision 3 1/2’’ x 1 1/2’’, Dark Shade adjusting Knob, On and off switch, Shade Range 9 - 13 from bright to Dark, Light Shade 4, Auto-Reaction Time 0.0001s, Recovery Time 0.4s from dark to bright, Power Supply 2 X AAA batteries ( Not Supplied), Suitable for Mig, Tig, Tag,Arc and Plasma ciutting.