The Osight SE Enclosed Reflex Sight features an enclosed design and side-loading battery that make it both incredibly durable and easy to maintain without removing the optic. The fully enclosed system provides robust protection against the elements for reliable performance in any operational environment. The side-loading battery tray provides for simple battery replacement without requiring removal or re-zeroing. The Osight SE Reflex Sight is made from CNC-machined, aircraft aluminum and features an aspherical glass lens for distortion-free clarity and rapid target acquisition. 8 daylight and 2 night-vision brightness settings provide the right aim point for any time of day. Up to 75,000 hours of runtime on one CR1620 battery (included). Fits Shield RMSc footprints. Fully enclosed system for protection against the elements Side-loading battery tray does not require removing or re-zeroing the optic Made from CNC-machined aircraft aluminum Aspherical glass lens for distortion-free views 8 daylight and 2 night-vision brightness settings Up to 75,000 hours of runtime on one CR1620 battery Fits Shield RMSc footprints