The Range Rover Pro Duo Dot adds an additional red LED inside the lens for a long range point of aim. With most hunting setups the red LED will provide a reference for 50 yards when the green LED is dialed to 20 yards. This reference provides a 50 yard point-of-aim, but also provides a sense of scale to “gap shoot” between the pins.
For long range practice, the red LED also provides a point-of-aim beyond the range of the calibrated tape. This distance will depend on arrow speed and flight characteristics. Below is a video which further discusses the new Duo Dot system.