Bright laser marks point of impact on the target which has a constant or pulsing beam mode option. Laser is compact, and lightweight design for comfortable concealed carry. There is a single battery design for easy replacement without having to remove the laser from the rail and includes 1 CR1 3N battery give. Fits Picatinny, Weaver, Glock and many other manufacture pistol rails. Is adjustable for windage and elevation and has an adjustable recoil lug for versatile positioning. Operates in temperatures between -4 to 149 degrees and has a 1 year warranty.