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The HS510C Open Reflex Circle Dot 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. Features Up to 50,000 hour battery life and Advanced Solar Fail Safe™ technology. Automatic reticle intensity adjustment in Solar Mode. 3 Reticle Options: 65MOA circle and dot, 2MOA dot only and 65MOA circle only Shake Awake™ – Motion on with last setting recall. Low battery warning. Parallax free, unlimited eye relief. IP67 Certified. Specifications CNC Milled 6061 Aluminum Housing with a Titanium hood. 0.5 MOA Windage & Elevation adjustments per click. 10 day light and 2 night vision compatible reticle brightness settings. Comes with a 1.41″ QD mount. Window Size 0.91×1.2 inches (32mm x 24mm).