The Rail Master Pro Universal Red and 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. The unit provides up to 1 hour of continuous use on a single CR123 Lithium battery. The Rail Master Pro also includes a powerful 400 Lumen white light for target identification. The unit features three operational modes including: Laser/Light Constant On, Laser Constant On, Light Constant On. Activation is instant, with Tap On, Tap Off controls.