Crimson Trace CMR-206 is a rail mounted green laser that fits on any mounting system with Picatinny or Weaver style rail. Green laser – that is more visible in daylight hours. Ambidextrous control on/off switch – allows user to instantly activate or deactivate the laser. Battery life is 2 hours of constant use. 5 Minute auto-shut off. Free battery each year from Crimson Trace. Heavy Duty Polymer Body. Aluminum Clamps increased clamp force to secure Rail Master to weapon. 2 Accessory Rail Clamps 2 options will fit most pistols with accessssory rails including Glock brand accessory rails. Fits shotguns, rifles or pistols with Picatinny or Weaver rails. User adjustable windage & elevation. Get your CrimsonTrace Rail Master laser today!