The Crimson Trace CMR-206 Rail Master is a compact universal green laser sight designed for firearms equipped with M1913 Picatinny or Weaver-style accessory rails. It features ambidextrous activation controls and a secure rail attachment system. Universal rail-mounted green laser. Compatible with Picatinny and Weaver-style accessory rails. Designed for compatible pistols, rifles, and shotguns. Adjustable windage and elevation. Includes rail fit adapters. Approximately 2 hours of continuous runtime with one 1/3N lithium battery. Product Type: Universal Laser Sight. Laser Output: 5mW Peak. Laser Class: Class 3R. Mounting Type: Picatinny / Weaver-Style Rail. Activation: Instant / Dual-Side Activation. Battery: 1 × 1/3N 3V Lithium. Runtime: Approximately 2 Hours.