The Crimson Trace LG-639 Lasergrips features a polymer grip with a rubber overmold activation pad on the rear. Built to fit Glock Compact pistols, the LG-639 makes a great addition to your firearm. Thanks to the Instant Activation, using this laser sight is incredibly easy. Simply hold your weapon in a normal firing grip to power on the bright red laser, visible at 50 feet away. With a master on and off switch, you can power down the unit when the laser isn’t needed. Two lithium batteries gives you over four hours of run time. This sight requires no special skills or tools to install, making it easy for you to attach it securely to your firearm’s frame.