These lasergrips are a rear-activated laser sight for GLOCK 3rd Generation Compact pistols in the following models: 19, 23, 25 & 32. Featuring Crimson Trace's famous Instinctive Activation, which allows the laser to be activated with a normal firing grip, They include a Master On/Off Switch for completely powering down the unit. User-installed in moments by attaching securely to the gun frame, these laser sights are fully adjustable for windage and elevation. Provides 4 hours of run time with (2) included 2032 lithium batteries.