The HS510C Reflex Sight has an open frame for a wide sight picture. Always on, it is powered by solar cell under normal usage, and a back-up battery to supplement power requirements in low light conditions. The reticle can be switched between a 65 MOA circle with 2 MOA dot, or a 2 MOA dot only at the push of a button. Better yet, the same LED projects both reticles, so no re-zeroing is necessary. When focusing on the target, the size of the reticle will change based on the distance between your eyes and objective lens.Parallax free optical design, with unlimited eye relief. Minimized obstruction of vision with push button controls and a streamlined housing design. Switchable circle/dot and red dot reticles. Always on unless manually turned off. Solar cell and high capacity battery provide dual power supplies. Quick release mount Ships within 1 Day - Thank you for looking at our items. The item "Holosun Technologies HS510C Open Reflex Circle Red Dot Sight Priority MAIL" is in sale since Tuesday, April 7, 2020. This item is in the category "Sporting Goods\Hunting\Scopes, Optics & Lasers\Red Dot & Laser Scopes". The seller is "dreamstoredirect" and is located in Sedona, Arizona. This item can be shipped to United States.