This lasergrip is a rear-activated laser sight and features Crimson Trace's famous Instinctive Activation, which allows the laser to be activated with a normal firing grip. It utilizes 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.