note:the helmet and the lens maybe send with different package， please wait patience when you only received one package. thank you for your understanding.<br /><br />this item adopts advanced circuit design， it works the<br /><br />moment you start work. when the arc is striked， the<br /><br />observing window darkens immediately. this welding helmet<br /><br />is suitable for all types of the electro-welding: arc<br /><br />welding， gas shielded welding， etc. except laser welding.<br /><br /> and durable<br />high strong materials and fire retardant<br />start work immediately<br />fashion appearance， ultra light designing， wearing<br /><br />comfortable<br />high performance solar cells and lithium battery<br />sensitivity and delay time is adjustable<br />grinding and welding mode can be chosen<br />permanent uv/ir protection<br />high definition protective filter<br />light states: din 4<br />dark states: din9~13 free adjustable<br />view area: 92 x 42 mm<br />response time(bright to dark): <1/30000 seconds (normal temperature conditions)<br />the turn time: (dark to bright): adjustable: 0.15s ~0.8s<br />sensitivity(welding based on current size): adjustable: low/high<br />battery: lithium battery + solar cells<br />uv protection: 16 levels<br />working temperature: -5°c ~ 55°c （23°f ~ 131°f）<br />storage temperature: -20°c ~ 70°c （-4°f ~ 158°f）<br />color:blue/red<br /><br />package include:<br />1 x auto-darkening welding helmet<br />1 x user manual.<br />3 x lens