Shoot farther, faster, and more precise. For long-range competitors and open-country hunters, the Impact 4000 is the all-in-one range and ballistic problem solver that delivers point-and-shoot solutions without coming off the gun. This advanced, rail-mounted laser rangefinder provides you with range, ballistic, and weather data via the integrated GeoBallistics solver, on-board Environmental Sensors, and our patented Wind Bearing Capture Mode. Intuitive to use. Rugged and reliable. It solidly mounts to any picatinny-style rail or rings with a diving board mount. Best of all, it functions in places your smartphone cant for deadly speed and precision no matter where you are. Specifications for Vortex Impact 4000 Ballistic Rail-Mounted Laser Rangefinder: Manufacturer: Vortex Rangefinder Application: Hunting, Shooting Maximum Range: 4000 yds Additional Features: Lithium Metal Battery Weight: 2.1 oz Color: Tan Minimum Range: 5 yds Water Resistance Level: Waterproof Battery Type: Lithium Metal, CR123A, CR2032 Accuracy: +/-0.5 yds Battery Quantity: 2 Shockproof: Yes Display Size: 1.3 in Display Type: LCD Fogproof: Yes Features of Vortex Impact 4000 Ballistic Rail-Mounted Laser Rangefinder Convenient wind/drop solutions. Easy to read display of wind/drop solutions from the shooting position. On-board geoballistics solver. Integrated geoballistics solver backed by a full, up-to-date bullet library. Customize ballistics profiles. Ten, preloaded, customizable profiles. On-board environmental sensors. On-board compass, humidity, barometric pressure, and exposed temperature sensors. Connect with vortex relay. Connects to the geoballistics app and bluetooth® remote. Picatinny mount Quick and reliable zero, wind bearing capture mode Built-in range card generator Pairs with third-party devices via the Geoballistics app Waterproof, Fogproof, Shockproof Package Contents: Vortex Impact 4000 Ballistic Rail-Mounted Laser Rangefinder Bluetooth Mounting Kit Easy Zero Tool Kit SureFit Cover Lens Cloth Custom Tools CR123 Battery CR2032 Bluetooth Remote Battery