Crimson Trace Laser Grips Guaranteed hit every time, designed for shooter's of all skill levels to always hit their target with greater speed, accuracy, and confidence. Simple to install and use, simply grab your gun and the laser is activated while you grip your gun; brilliant red light pinpoints your hit. Feature a .5" red beam at 50', include two CR2032 lithium batteries that will run continuously for 4 hours, allen wrenches for installation, and a limited warranty. Please contact Crimson Trace for warranty information and product return information. S&W K,L,N Frame Square Butt, LG207.