LL-807G Laserguard Pro for GLOCK Full-Size and Compact pistols is a powerful green laser sight and 150 Lumen LED white light in a single compact unit. This illumination and targeting product is activated with Crimson Trace's famed Instinctive Activation, which activates the unit via a front activation button when the pistol is held in a normal firing grip. The LL-807G features four modes of operation (see below), a Master On/Off Switch, is completely user-installed in moments with no modifications to the gun frame and the laser is user-adjustable for windage and elevation. Offers 2 hours of battery with a single CR2 Lithium battery.This model will fit the follow GLOCK pistols: Third Generation 17, 17L, 19, 22, 23, 24, 25, 31, 32, 34, 35, 37, 38, Gen4 17, 19, 22, 23, 31, 32, 34, 35, 37 and Gen5 17, 19, 19X..