The Glock brand tactical light with laser is an excellent value. Set the selector switch to one of the following: no light or laser, light only, laser only, or light and laser at the same time. Slide it on your rail-equipped Glock or any Picatinney type rail or base. Then you are ready to activate it by pressing the ambidextrous rocker switch with your trigger finger, or other finger. The rocker switch has a momentary position, or press it further until it locks for continuous use. Windage and elevation adjustment may be done to the laser's point of aim. Use 2 CR123 batteries (included). Includes plastic carry case, mini laser adjustment tool, extra lamp, and instructions. This unit is waterproof to 10m (33'). Service life: light: 1.1 hours / laser: 21 hours / light and laser at the same time: 1 hour.   Made by Glock for Glock pistols this ingenious tactical light will fit all Glock models with accessory rails as well as Springfield XD and most other handguns with the rail system.