Leupold’s RX Fulldraw 4 features Archer’s Advantage software, which calculates arrow weight, arrow velocity and peep height for better accuracy. The Flightpath feature will determine if your arrow will clear obstructions, like hanging limbs, out to 150 yards, and the 6x magnification power should give you plenty of power to put an eye on big bucks. This unit is waterproof and fogproof, plus the OLED technology is adjustable to match display intensity for changing light conditions.