Function features: 1.Completely protect your eyes. when welding the red/uv and strong light. 2.Release handsthen reduce the time of welding machine 3.Solar power and special lithium battery power supply Do not any replacement. 4.You can according to adjust the dark state through the external adjustment knob.No need to pick up the hat for adjustment. 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 Description: Shade Adjustment Features a shade adjustment for light or dark settings. This feature allows you to set the helmet to a lighter shade when welding thin material and a darker shade for welding heavier material. Sensitivity Adjustment The sensitivity adjustment adjusts for ambient lighting and the arc brightness. This will compensate when you walk outside in the bright sun light. Adjustable Shade Delay This is how long the helmet takes to from the light state to the dark state. This setting comes in handy when welding heavy material and compensates for the bright molten metal left over after your done welding. Plasma Cutting Allows you to use the helmet locked in the light state (shade 4) which gives you full UV and IR protection . Plasma cutting has a limited arc but still requires protection. This setting lets you see what you are cutting while providing maximum protection. Oxygen Acetylene Torch Cutting This setting is perfect for torch cutting with an oxygen acetylene torch. Offers full face protection while cutting. Grinding Setting mode This setting you to see what you are grinding while allowing full face protection. Fully Adjustable Head Gear Features fully adjustable ratcheting headgear. Also includes a very comfortable sweat band. The head gear allows you to position the helmet further or closer away from your face. This feature is only found on $400 welding helmets. Super Light Weight Helmet is extremely light-weight to prevent user fatigue. Flame Skull Look Finished in a very cool Flame Skull look. There no other welding helmets on the market with this new Flame Skull finish.