The Vector Optics Reticle Is The Best Available On The Market. It Is constructed To Be Very Durable For years Of Use. Special features Of The Multi-Reticle Holographic Sight Include: - Tubeless Design With 33mm Reflex Lens Aperture provides a Wide Field Of View--Suitable For Rapid-Firing Or Shooting Of Moving Targets In Addition To Normal Shooting. - Multi-Reticle (4 patterns) - Parallax Corrected And Unlimited Eye-Relief. - Auto Brightness Control So You Won't Need To Adjust The Brightness In Different Light. This New Feature assures You Will always Have a Perfect Sight Picture. - Allen Head Screw Type Windage And Elevation Click adjustments, With Locking Screw - Built-In Mount With Integrated Rail For Standard Bases--No Need To Re-Zero When remounting - Very Light Weight, Waterproof, And Shockproof. - Lower Power Consumption For Long Battery Life. - Includes Battery, Adjusting And Mounting tools, Lends Cover And lends Cloth.