Swarovski dS Digital Riflescope 5-25x52 P - Gen 2 - 4A-i:The dS automatically displays the correct aiming point and all the data you need in high resolution and in real time. Hunters no longer need to adjust the rifle scope manually, making it much easier to tackle long-range shots. The aiming point is calculated based on precise distance measurement, the angle of fire, the magnification selected, air pressure, temperature, and the ballistic data for your personal firearm/ammunition combination.The dS Configurator App is used to enter the data on your firearm/ammunition combination and to configure the display. The ballistic curve and your individual display configurations are then transferred directly to the dS quickly and easily via Bluetooth.