NcSTAR Tactical Blue Laser with Pressure Switch and Rail Mount Compact Blue Laser with Weaver/Picatinny type rail mount that will fit Weaver/ Picatinny/ MIL-STD 1913 type rails. Includes mounting tool Blue Laser: Freq. 450nm, Class IIIa Laser, Maximum Output: &lt;5mw Fully Adjustable for Windage and Elevation. Includes adjustment tool Momentary End Cap Pressure Switch and it also comes with Remote Coil Pressure Switch Uses 1 CR123A Lithium Type Battery (Included) Class IIIA Laser Product, 5mW power output