Dagger Defense DD102 Red Dot Reflex Sight Scope- Reflex Sight Optic and Substitute for Holographic red dot Sights Red and Green dot sight scope with four position reticles. Comes with locking screws for your sighting adjustments APERTURE33mm LENGTH82mm FIELD OF VIEW15.8m@100m RAILPicatinny Includes Optic, CR2032 battery, hex wrench and lens cloth Mounts on standard picatinny rail systems