Own one of the most innovative and effective hunting riflescopes in the world. Burris combined outstanding optics with pinpoint laser rangefinding and precise trajectory compensation. Range your target and use the aiming dot for a perfect holdover on your target. No other riflescope combines this level of quality, technology, accuracy, repeatability and effectiveness. With proper practice, this optical instrument will greatly increase the distance at which you can make an ethical shot. The scope comes with tables listing the types of bullets in popular calibers, from .17 Remington to .50 BMG, made by many major ammunition manufacturers. First, decide if you want to work in meters or yards. Next, find your load on the provided tables or Burris' Internet site and locate the corresponding drop number. Then, program your drop number into the LaserScope. Set the reticle to display a series of aiming dots for yardages from 100 to 500, or a single aiming dot for the range digitally indicated at the top of the field-of-view. You can activate the rangefinding/drop-compensation display by touching a button on the side of the scope tube, or by using a removable remote switch you can easily attach to the front stock of your rifle. Like other premium riflescopes, the Eliminator has elevation and windage adjustment with 1/4" clicks at 100 yards. Accuracy is +/-2 yards at ranges out to 500 yards. Rotate the eyepiece to sharpen image focus. Waterproof and fogproof, this LaserScope functions reliably in temperatures from 14°F to 122°F. Scope is powered by a single CR-2 battery. Remote uses a CR-2016 battery.