This green laser pistol sight flashlight combo has a picatinny rail mount and electronic control buttons are completely ambidextrous works great with full size Glock handguns and most other full size pistols with rail. There are four button on each side of the weapon pistol flashlight with strobe and tactical laser sight. There is a Flashlight Momentary button on top, Flashlight Constant On/Off button on the bottom, the Middle button turns the Laser On/Off, and the Flashlight Strobe button is at the front. Momentary & Constant On/Off buttons are positioned and angled ergonomically. They are accessible from your Trigger Finger or your support hand thumb when gripping the pistol. 3W Ultra Bright 200 Lumen CREE LED flashlight. Slides onto most Weaver / Picatinny / MIL-STD 1913/ Pistol accessory spec rails. Fully Adjustable Green Laser: 532nm, Max output <5mw, Class IIIa Laser Dimensions: 3.4L x 1.5W x 1.6H Black Anodized Aluminum body. Uses 1 each CR123A Battery Included.