Equipped with LED technology, the Holosun HS503CU 20 mm Solar Micro Red-Dot Sight boasts a 2-MOA red dot with a 65-MOA circular reticle pattern for simple targeting. The level of brightness automatically adjusts for optimal viewing, while the U-shaped housing shields the windage and elevation turrets from damage. Plus, the sight is partially powered by solar technology to help maximize the lifespan of the battery.