Features and Benefits:- Viewing Area: 3.82" x 3.19" (97 x 81mm)- Shade: Varible 9 ~ 13- Arc Sensor: 2-Shade Control: External / Internal-Power On/Off: Fully Automatic- Sensitivity Control: Low~High, by infinitely dial knob- Switching Time: 1 /25,000 s. from Light to Dark. Delay (Dark to Light): 0.1 ~ 1.0s by infinitely dial knob- Approved: DINplus, CE, ANSI Z87.1, CSA Z94.3, AS/NZS 1338.2- Power Supply: Solar cell & Battery replaceable, 1*CR2450 lithium battery- Not for Laser Welding or Oxyacetylene Welding/CuttingTop-quality ADF lens, optical class: 1/1/1/2, which can provide the best safety protection for eyes and clearest view. High-resolution lens technology brings high-definition visual experience, increases eyes comfort, and reduces fatigue greatly, especially for a long period welding job in the Industrial field. For most welding/cutting applications, also including grinding mode.