Features: Enhanced Performance: Four arc sensors for high response Auto-Darkening: Automatically turns from light to dark and dark to light Variable shade: Adjustable welding shade levels from 9 to 13 Light Shade DIN Level: Level shade 4 Sensitivity control Range: Low to High Welding or Grinding: Selection for process mode Affordable: Value-priced Solar-Powered: So you dont have to worry about changing batteries Delay adjustable controls: Selection for switching speed: Short=0.25s to 0.35s Medium=0.35s to 0.50s Long=0.50s to 0.80s Support: Backed by Tweco support, quality, reliability, and 2 year warranty Specifications: Filter Lens Dimensions: 110mm x 90mm x 9mm Viewing Area Dimensions: 97mm x 43mm Reaction Time: 1/30,000 second Sensors: 2 or 4 Optical Sensors Power Supply: Solar Cells Inactivated Shad and Grinding Level: 4 Variable Shade Level: 9-13 Operating Temp: -5 degrees C to +55 degrees C Storing Temp: -20 degrees C to +70 degrees C Sensitivity Range (Light to Dark): Low- High Delay (Dark to Light): 0.25 sec to 0.80 sec On/Off Control: Automatic Weight: 15.873oz