Holosun ARO 1x Green Dot - 2 MOA Dot - The Holosun ARO (Advanced Rifle Optic) Dot Sight is an advancement on the popular Holosun 20mm 403 and 503 series optics. The ARO features an all-new 22mm housing design that mates perfectly with Holosun magnifiers and includes an all-new 1.63in lower 1/3 co-witness pedestal mount for optimal targeting performance. FEATURES: 2 MOA Dot - Green Dot: Accuracy at intermediate distances. Up to 50,000-Hour Battery Life: Extended runtime for long-term reliability. Shake Awake Technology: Auto-on/off feature for instant activation. IP67 Waterproofing: Ready to perform in any environment. Durable 6061 Aluminum Housing: Built for maximum resilience. 10 Daylight and 2 Night Brightness Settings INCLUDES: Holosun ARO GR2 - Green Reticle CR2032 Battery Multi-Tool Lens Cloth User Manual