The Laserguard Pro for Glock pistols is a powerful 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. It features four modes of operation, 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. Modes of operation:Laser + LightLaser OnlyLight OnlyLaser + Light Strobe DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.