Holosun ARO 1x Red 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 - Red 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 RD2 - Red Reticle; CR2032 Battery; Multi-Tool; Lens Cloth; User Manual;