Tactical Reflex Dot Sight with Rails

4 Mode Red/Green Reticle Holographic w/Accessory Rails The Perfect Solution for Rapid Target Acquisition up to 100 Yards with 'Both Eyes Open' Comfort & Precision.  Red and Green Dot & 4 Reticle Modes. Lightweight & Weather Resistant.  The Anti-Dust, Anti-Shock and Anti-Fog Lens Assembly Allows for Use in All Weather Conditions. Specs: Obj. Aperture: 33 mm    Field of View @100yds 15.8m   Eye Relief:  3-3.5" Rail Length: 22mm  Weight: 10.2 oz.   Length: 3.2"   Construction:  Aluminum AlloyBattery: Qty 1 x CR1620 (included!) TOOLS INCLUDED: Adjustable windage and elevation (Hex keys included). Unlimited eye-relief and corrected parallax. Tubeless design with 33mm reflex lens and a wide field of view (15.8m@100m) for close to mid-range targets. PICATINNY RAIL MOUNT: Equipped with a built-in picatinny scope mount base that fits 20mm rails and provides easy sight remounting. SIGHTING OPTIONS: Four interchanging reticle patterns with red and green holograph options (plus adjustable brightness) provide different sights to fine-tune your eyeshot from dawn to dusk.  ULTIMATE DURABILITY: Aerospace-grade aluminum alloy construction for lasting dependability and easy maintenance and cleaning (cleaning cloth included).  WATER/FOG/SHOCK PROOF: Water-proof, fog-proof and shock-proof properties protect internal components and enhance performance in all weather conditions. The light-weight design upgrades your experience.