Crimson Trace Corporation, RailMaster Green Laser and Tactical Light, Universal Rail Mount, Black Finish WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Switch activation Laser sighted at 50Ft .5 inch diameter at 50 feet The Rail Master Pro(TM) Universal Green Laser Sight & Tactical Light combines two tactical tools in a single compact unit. The versatile unit is designed to fit most modern pistols, rifles and shotguns with an M1913 Picatinny or Weaver-style accessory rail. A powerful green laser anchors the unit and provides up to 1 hour of continuous use on a single CR2 Lithium battery. The Rail Master Pro also includes a powerful 100 Lumen white light for target identification. The unit features four operational modes including: Laser/Light Constant On, Laser Constant On, Light Constant On, and Laser w/Light Dazzler. Activation is instant, with Tap On, Tap Off controls and a programmed Auto Shut Off at five minutes to conserve battery life.