LL-807 Laser guard Pro for GLOCK Full-Size and Compact pistols is a powerful red laser sight and 150 lm 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-807 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 hr of battery with a single CR2 Lithium battery. Features: Trigger guard attachment Windage and elevation adjustable Master on/off switch Modes of Operation-Laser + Light, Laser Only, Light Only, Laser + Light Strobe