Maximize targeting speed while preserving your peripheral vision with the EOTechA(R) 512.A65 Reflex Sight. It's designed for anyone needing speed and versatility in close to midrange targeting with true, "both eyes open" display and wide field-of-view. Two brightness adjustments keeps the reticle visible in all weather conditions. Even when obstructed by mud, snow or rain, it's fully operational. 65 MOA circle with 1 MOA aiming dot reticle Front window is 1/8" solid glass, rear is shatter-resistant laminate Waterproof, submersible to 10'. Fogproof with a nitrogen-purged optical cavity. Temperature range from -40Adeg to +150AdegF Scroll through 20 brightness settings for visibility in any light 1/2 MOA click adjustment Unlimited eye relief Non-reflective black hardcoat finish and rugged aluminum hood assembly Uses 2 AA lithium, alkaline or rechargeable batteries (not included) and an auto shutoff feature for up to 1,000 continuous hours of use Measures only 5.6" x 2" x 2.5"h