Feature RDSL35 VictOptics SRD 1x27x39 Eight-Reticle Red Dot Sight Eight Reticle Options Including Dot, Crosshair, and Circle for Flexible Targeting Extra-Large 27x39mm Window Offers Clear Wide Field of View for Faster Acquisition Five Brightness Levels with Green and Red Illumination for All Light Conditions Side-Loading Battery Tray Enables Easy Replacement Without Losing Your Zero Quick-Release Picatinny Mount Allows Fast and Tool-Free Setup or Removal Specification RDSL35 VictOptics SRD 1x27x39 Eight-Reticle Red Dot Sight Specification Details Magnification N/A Window Lens Size 27x39 mm Parallax Free (