The Holosun HS 510C is a wide window red dot sight offered by holosun. This optic features a 2 MOA dot, a 65 moa circle or a combination of a 2 moa dot 65 moa circle. On the single dot option, you have an amazing 50,000 hours of battery life and 20,000 hours battery life when you're using circle and dot combination. On the top of the optic has a solar panel which is amazing for battery retention. This optic also comes with a memory function for brightness settings which means whatever setting of brightness you choose. It will remember and come back to that setting when turned off and turned back on. This optic comes with 10 daylight settings and 2 night vision settings. The height of this optic is 1.41 inches and comes with a detachable quick detach mount. On the right side of the optic, there is the battery tray and the frame of this optic is made of a solid titanium. This optic is also waterproof and parallax free. On the left side of the optic are the adjustments for the brightness and on the top and the right side of the optic are the adjustments for the reticle. Included in the box is the user manual,lens cleaning cloth, tool for adjusting an additional battery tray and a mounting tool.