It's important to hit the things you shoot at. This red laser sight easily attaches to your pistol or handgun with the included mount. In no time, you'll be shooting more accurately and more confidently. Plus, you'll be hitting meaningful targets, like bears and ducks and manly things, as opposed to the pretty little flowers that just happened to be in the way of your poorly aimed shot. 100% brand new. Get a red laser sight, and hit your target every time. Windage and elevation can be adjusted with included wrenches. Metal housing is compact, lightweight, and durable. Wavelength: 835-655nm. Battery: use 3 pcs AG13 ( not include ) because customs. Total length: 57.8mm (2.28"" approx). Tube length: 54.36mm (2.14"" approx). Tube Diameter: 15.8mm (0.62"" approx). Mount Size: 26 x 25 x 30mm (1.02"" x 0.98"" x 1.18"" approx).