EYE PROTECTION : Auto-darkening filter switches from light to dark in 1 / 25000 sec , in event of electric failure , the welder protecting against UV and IR radiation according to shade 16.1 / 2 / 1 / 2 rating meets ANSIZ87.1-2010 and EN3794 / 9-13 standards A smart for MANUAL MEETS DIFFERENT DEMANDS : Equipped with sensitivity and delay settings for adaptability for different environments and task durations ; Enjoy enhanced visibility and color recognition.Light of filter is DIN4 and the time from dark to bright within 0.1s to 1.0s CLEAN COMFORTABLE VIEW : Equipped with standard 3.62 ’ ’ x 1.65 ’ ’ clear viewing area ; Diffusion of light , variation of transmittance and angular dependence allowing the welder to see clearly at different angles ; Light weight ( 1 suitable for long time working ; Balanced with an adjustable and fatigue-free comfortable headgear INTELLIGENT , PRACTICAL AND COST-EFFECTIVE : The Auto Darkening Filter ( ADF DX-500S ) enables welders to adapt to various working environments by controlling the shade of the lens ; Sensitivity adjustments from lighting sources ; Battery powered with solar panel technology for longer life ( up to 5000 hrs GOOD FOR VARIOUS WORKING ENVIRONMENTS : Recommended to automotive , construction , and food & beverage manufacturing , metal production and fabrication , maintenance , repair and ( MRO ) , mining , oil and transportation, Manufacturer: Watreketal