Function features: 1. Completely protect your eyes when welding. 2. Release handsthen reduce the time of welding machine. 3. Solar power and special lithium battery power supply no need any replacement. 4.You can adjust the dark state according to the external adjustable knob. 5. It can be widely used in the mainstream way of spot welding argon arc welding carbon dioxide gas shielded arc welding plasma welding etc.