The Crimson Trace LG-637 Lasergrips offer a seamless integration of precision and convenience for your Glock Gen 3 4 and 5 full-size handguns. Designed with the renowned Instinctive Activation feature these laser sights engage with a natural firing grip ensuring immediate readiness without any extra effort. The red laser provides clear visibility up to 50 feet with the capability to adjust for windage and elevation to suit your shooting needs. A Master On/Off Switch allows you to conserve battery life when the laser is not in use. Constructed with a durable black rubber overmold finish the Lasergrips attach effortlessly to the gun frame making installation quick and easy. Enjoy up to four hours of continuous use powered by two CR2032 lithium batteries included for your convenience.