The Crimson Trace Cmr-206 Rail Master Universal Green Laser Sight Is Compact, Yet Powerful, Universal Green Sight. Ambidextrous Control Tabs Allow The User To Instantly Activate Or Deactivate The Light. The Human Eye Processes The Color Green More Effectively Than Any Other Color, And Crimson Trace Offers The Brightest Green Light Allowed By Law, (5Mw Peak, 515Nm, Class 3R). The Cmr-206 Rail Master Boasts 2 Hours Of (Constant) Run Time On A Single 1/3N Lithium Battery, And Features A 5 Minute Auto Shut-Off For Power Conservation. The Cmr-206 Offers 3 Modes Of Operation: Momentary, Strobe, And Constant-On. This Allows The User To Easily Set Their Mode Based On Personal Need Or Preference. The Unit Is Quickly And Easily User-Installed In Moments And Can Be Painlessly Transferred. The Cmr-206 Is Securely Fastened Using Crimson Trace'S Secure Lock Technology.