The LG-452 Laserguard is Crimson Trace"s first GLOCK green laser sight. Designed to fit most 3rd and 4th Generation GLOCK"s by attaching firmly to the trigger guard, the LG-451 features unmatched low-light and daylight visibility - greatly enhancing the defensive capabilities of your GLOCK. Also features Crimson Trace"s patented Instinctive Activation, which allows the green laser to activate when the pistol is held in a natural firing grip.Specifications:- Platform: Laserguard - Material: Polymer - Color: Black - Activation Location: Front Activation - Master On/Off Switch: Yes - Attachment: Trigger Guard Attachment - Battery Type: One CR2 Lithium Battery - Finish: Polymer Housing with Rubber Overmold Activation Pad - Installation: User Installed - Laser Battery Life Over: Two Hours - Activation Mode: Pressure Activated - Sighting: Factory Sighted at 50" - User Adjustable Windage and Elevation - Warranty: Three Year Full Warranty - Dot Size: Approx. 0.50 at 50" - Fits: Green Laser Sight for GLOCK 3rd Gen 17, 19, 22, 23, 31, 34, 35, 37, 38 and 4th Gen 17, 19, 22, 23