Vism compact green laser sight for pistols with strobe mounts onto most Weaver, Picatinny MIL-STD 1913 pistol accessory rails and fits Glock 19,23 etc handguns and most others pistols with rail. Button on each side of green laser sight body allows the user to turn on/off laser sight and when pressed and held down turns the strobe feature on/ff. Fully Adjustable Green Laser 532nm, Max output <5mw, Class IIIa Laser. Dimensions: 2.0L x 1.1W x 1.1H. Black Anodized Aluminum body. Uses 2 each CR1/3 N Batteries Included.