Feature RDSL36 VictOptics SRD 1x23x33 Four-Reticle A Flexible Reticle Options: 4 Reticle Choices Including 3.5 MOA Dot, Crosshair and Circle Support Different Shooting Styles and Needs A Expanded Sight Window: Large 23 x 33 mm Window Provides a Clear and Wide Sight Picture for Faster Target Acquisition Speed Overall A Adaptive Light Settings: 6 Brightness Levels with Red and Green Dot Options Adjust Smoothly to Changing Light Conditions Quickly A Quick Battery Access: Side-Loading Tray Enables Fast Replacement without Removing Optic or Losing Zero While Shooting Easily A Fast Mount Installation: Quick Release Picatinny System Allows Tool-Free Setup and Removal for Everyday Shooting Convenience Specification See our Terminology Guide for detailed explanations of each specification. Specification Details Magnification: N/A Window Lens Size: 23x33 mm Parallax: Free (