BEAMSHOT BS8200S Tri-Beam Laser Sight for Rapid Target Acquisition/Unique TRI-Beam Laser Design by Beamshot(CR123A Battery included) Perfect for rapid & accurate close tactical target acquisition Ambidextrous Momentary/Constant on/off toggle switch design; Innovative quick attach/detach weapon rail mounting system for M1913/Picatinny rail Best accessory for home defense, we recommend using the BS8200 on your handgun or with a BEAMSHOT RF9 mount on your shotgun for the best performance Built-in dual function wrench for laser adjustments and a CR123A Battery that provides approximately 12 hours continuous laser use is included NOTICE: The laser sight emits three dots in a triangular pattern, but not a perfect regular triangle