The Ncstar Keymod quick release compact Military rifle red laser sight is a low profile design to gets the laser closer to the bore of the firearm. The Ncstar auto-locking keyMod quick release laser sight mounts directly to any KeyMod slots with a flip of a lever, no tools required to mount your red laser sight. The Red Laser operates with a single multi-function button. Press and hold down the button for more than a second and the laser powers On. Tap the button to use the Strobe feature. Press and hold down the button to power the laser Off. Fully adjustable for Elevation and windage. Laser runs on two CR1/3N lithium batteries (included). Battery door locks in place, depress the center button and slide door a ¼" and lift door to access battery compartment. Laser body constructed of polymer, and the KeyMod™ base is made from steel. Length 2.5 inches.