HOLOSUN Circle Dot Solar Sight, 2 MOA Dot, 65 MOA Circle, Black Hs515cu is a new micro red dot sight with the option of a 2moa dot only or a 2 moa dot with a 65moa Employing new LED technology, the life time for one cr2032 battery can reach 2 years if left on Kill flash included Flip-up lens covers won't obstruct your vision 1/3 co-witness qr mount included