The Aimpoint CompM4s Red Dot Sight comes with a low battery compartment. With a single AA battery, it permits continuous use of as much as 80000 hours. It offers seven NVD settings and 9 sunlight settings, so you’ll make adjustments accordingly. Its front lens opening permits addition of killFlash anti-reflective device. Designed with a 2 MOA dot, the sight is acceptable for both short and long distance shooting applications. As well as, it’s submersible as much as 150 feet. The thing has small scratches from use, however works perfectly. Also comes with removable honeycomb lenses.