Leupold's Professional-Grade Red Dot Optical System offers unmatched light transmission that's designed to outperform in the most challenging lighting conditions, industry-leading glare reduction for a clear image in harsh, direct light, and the resolution and clarity that professional guides and shooters demand in the field. The ZeroStop system creates a backstop when returning the dial back to zero, so you don't accidently turn the dial a full revolution in the wrong direction. Motion Sensor Technology (MST) extends battery life by automatically deactivating illuminated reticles after five minutes of inactivity and then reactivates instantly as soon as movement is detected. Includes AR-specific mount. Battery Life at Brightness 4 of 8: 1000 hours minimum RDS no mount with battery = 7.2 ounces RDS with mount, battery & capped adjustments =12.6 ounces Dot provides definitive aiming point 1 MOA (minute of angle) dot is ideal for precise shot placement Does not obscure target Provides wide field of view Rapid target engagement Red illumination 1 MOA is approximately 1 inch at 100 yards