Long-range shooting has become more popular in recent years, and shooters are increasingly turning to high-power optics that allow for accurate aiming at distance. But what if your riflescope could actually tell you were to aim, out to a mile? That's exactly what the Revic Optics PMR 428 4.5-28x56mm Smart Riflescope is designed to do. When aiming at a target with the Revic Optics PMR 428 4.5-28x56mm Smart Riflescope, all users have to do is pair the optic with a smartphone-based calculator app. The scope features built-in sensors that measure direction, incline, cant, pressure and temperature and send all those variables to the app for calculation. Powered by AAA battery Mfg: Revic Optics