The NcSTAR VAPRLSBLKM blue laser sight delivers a 450nm aiming reference and selectable strobe function in a compact rail-mounted package. Designed for Weaver, Picatinny, MIL-STD-1913, and pistol accessory rails, it supports compatible full-size and compact pistols.Adjustable windage and elevation help align the beam, while bilateral controls provide direct operation. Press to switch the laser on or off; hold while active to toggle strobe.450nm blue laser, maximum output below 5mW; Class IIIa.Fits accessory rails measuring 1.7-2.0 inches.Patented KEYMOD undermount supports future KEYMOD accessories.International orders do not include batteries.Select this rail-mounted laser for technical aiming applications.