HOLOSUN Infiniti HS402C Solar Power Monocular Red Dot Sight Two power systems: Primarily Solar Powered, the red dot brightness auto adjusts according to available light; Switch to Battery power in dark (50,000 hours battery life) Military grade optics without the military grade price High quality clear lens with crisp red dot and 12 brightness settings (10 Daytime and 2 Night Vision) Parallax-free; when the red dot is on the target, so are you; 2 MOA dot size Fully waterproof (Class IP67); High strength aluminum, MAO finish; LIFETIME WARRANTY