Glock compact Crimson Trace Laser Grips... G-Series LG-619Fits Models: GLOCK 19, 23, 25, 32, 38 Activation Instinctive Activation; Rear User Adjustable Both Windage and Elevation Warranty 3 Years Complete Beam Intensity 5mw peak, 633nm, class IIIa laser. Maximum output that federal law and technology allow. Dot Size Approximately 0.5" diameter at 50 feet. Power Source Two #2032 lithium batteries (included); over four hours of on-time use and a five year shelf life