Shoot farther, faster, and more precise. For long-range competitors and open-country hunters, the Vortex Impact 4000 Ballistic Rail-Mounted Laser Rangefinder is the all-in-one range and ballistic problem solver that delivers point-and-shoot solutions without coming off the gun. Mounts to any picatinny-style rail or rings with a diving board mount Easy to zero and reliably holds it zero even under heavy recoil Easy to read display of wind/drop solutions and the ability to make adjustments while in the shooting position Equipped with the accurate GeoBallistics Solver backed by a full, up-to-date bullet library Customize profiles or use one of the ten preloaded profiles for popular cartridges On-board compass and exposed temperature, pressure, and humidity sensors Manually enter speed and direction with patented Wind Bearing Capture Mode What's in the Box : Bluetooth Remote Bluetooth Remote Mounting Kit Easy Zero Tool Kit SureFit Cover Lens Cloth Custom Tools CR123 Battery CR2032 Bluetooth Remote Battery