The Crimson Trace CMR-301 Rail Master Pro 400 Lumen Green Laser Tactical Light combines two tactical tools in a single compact unit. The versatile unit is designed to fit most modern rifles and shotguns with an M-Lok or M1913 Picatinny and Weaver-style accessory rail. A powerful green laser anchors the unit and 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 from a provided remote tether.WARNING: This product may contain chemicals known to the State of California to cause cancer or reproductive harm. For more information, go to www.P65Warnings.ca.gov.