AimShot HGPRO-B-G Green Cross Hair Reflex Sight, Black Hg-pro-b-g Reflex sight, green illuminated Crosshair reticle 2000+ hours of battery life with a single included CR123A battery 9 step brightness adjustment with night vision mode Lens parallax-free 34mm coated Reflex lens Integrated adjustable quick Release for Picatinny rails