Don't ever be stuck at the range or in the field with a red-dot optic that's out of juice. The Holosun HS403C Solar Micro Red Dot Sight is purpose-built to ensure that hunters and shooters have an optic that can run off multiple power systems. The Holosun HS403C Solar Micro Red Dot Sight is built with a combination of built-in solar panels combined with an ultra-efficient LED system that uses a bare minimum of power to provide an aiming point measuring 2 MOA in diameter. In sufficient sunlight, the optic can run without depending on a battery backup. Adjustment value: 1/2 MOA Features 12 brightness settings 50,000-hour battery life Weight: 4.3 ounces Mfg: Holosun