Item No.: G29B825
·Filter size : 110x90mm  
·Optical class:1/2/1/2  
·Viewing window : 92x42mm  
·Power ON/OFF : fully automatic   
·Power supply :solar cells  
·Switching time from light to dark:1/25000 second  
·Switching time from dark to light:0.1~1s by infinitely dial knob  
·Light shade number : DIN4  
·Dark shade option : DIN9-13  
·Shade Control: external,variable shade  
·Sensitivity Control: low/mid/ high  
·Grinding function: Yes  
·Low volume alarm：yes  
·Net weight  :490g  
·Operating temperature :-5℃~55 ℃   
·Storing temperature: -20℃~70 ℃