Thanks to its multicoated 35mm objective lens, Aimpoints Hunter H30 Red-Dot Sight gathers light exceptionally well so it is bright even in low-light situations. Can be shot with both eyes open, is parallax-free and has unlimited eye relief so your field of view is unhindered and target acquisition is fast. 2 MOA dot covers very little of the target so you can be precise even from a distance. 12-position digital push-button intensity adjustment lets you easily adjust the dots brightness to match the conditions. Fully waterproof and unaffected by extreme weather conditions. One CR-2032 battery (included) provides up to 50,000 hours of constant operation. Adjustment turret caps are the only tools required to zero the sight. Easily mounts on your favorite gun using standard 30mm rings. H30S (short) is perfect for rifles with standard length actions, hunting shotguns and magnum handguns. 30mm tube diameter. Available: H30S with Rings, H30L with Rings. Size: H30L W. Type: Electronic Sights.