"Designed for the enclosed pistol optic category, the Holosun AEMS Macro MRS Reflex Sight features an enlarged 0.9x0.9"" viewing window that gives you a bigger, brighter sight picture. The Multi-Reticle System features a 2 MOA red dot and 32 MOA red circle that helps guide your eye to the dot. The 32 MOA circle can be used alone or deactivated to leave just the 2 MOA dot. It still features Shake Awake technology that brings the unit to life with the slightest touch and deactivates when it senses inactivity providing up to 100,000 hours of battery life on a single CR1632 battery. Automatic brightness control combines with Solar Failsafe technology to provide the ideal dot as the light around you changes, while manual brightness controls with 8 daylight and 4 night-vision settings provide full control of the unit. The AEMS Macro features a rugged 7075-T6 aluminum housing that fits standard 509T plates and provides 5,000G vibration resistance. It's also waterproof to IPX8 standards. Designed to compete in the enclosed pistol optic division Enlarged 0.9x0.9"" viewing window Multi-Reticle System: 2 MOA red dot with 32 MOA red circle Automatic brightness control with Solar Failsafe Manual brightness control with 8 daylignt and 4 night-vision settings Shake Awake technology Up to 100,000 hours of battery life on one CR1632 battery Waterproof to IPX8 standards"